CN116934078A - Gradual assessment method for sudden water gushing disasters in tunnel/channel construction period - Google Patents
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- 238000010276 construction Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 90
- 238000011156 evaluation Methods 0.000 claims abstract description 35
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- 238000012544 monitoring process Methods 0.000 claims abstract description 22
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- 230000003204 osmotic effect Effects 0.000 claims description 11
- 230000009172 bursting Effects 0.000 claims description 10
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- 238000001764 infiltration Methods 0.000 claims description 10
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- 230000000750 progressive effect Effects 0.000 claims description 8
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- 238000012502 risk assessment Methods 0.000 abstract description 3
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Abstract
The invention discloses a gradual assessment method for sudden water gushing disasters in a tunnel/channel construction period, which solves the problem of sudden water gushing disasters risk assessment under construction period monitoring conditions, and the method utilizes engineering hydrologic exploration information to pre-assess sudden water gushing disasters in the early stage of construction and give out corresponding sudden water gushing grades so as to formulate measures such as excavation supporting, monitoring and measurement; meanwhile, on the basis of pre-evaluation, gradually evaluating sudden water disaster possibly occurring in the construction period according to excavation monitoring information, and finally determining the risk level and predicting sudden water inflow; the assessment method is simple to operate, can be used for assessing the current construction section in actual engineering practice, and can also predict the water inrush risk possibly existing in the non-construction section.
Description
Technical Field
The invention belongs to the technical field of underground engineering construction safety, and particularly relates to a gradual assessment method for sudden water gushing disasters in a tunnel/channel construction period.
Background
The underground engineering construction of the railway tunnel, the highway tunnel, the diversion tunnel and the like in China rapidly develops to the western karst mountain area, and has the characteristics of long line, large burial depth, and complex topography condition and geological structure. For example, the tunnel in the blue railway has a 67.07 percent of the tunnel ratio, is up to 15km, has a maximum burial depth of 1900m and passes through the fault movable zone for multiple times. Although the development of tunnel construction is rapidly increased, due to the existence of unfavorable geology such as mountain area fault cracks, underground hidden rivers and the like, the water-containing structure of the tunnel is easily damaged when construction is disturbed, and further the fault cracks and the like are further expanded to form a water bursting channel under the disturbance, so that water bursting disaster occurs, and the construction difficulty is increased, economic loss and serious casualties are caused.
The tunnel water bursting disaster has randomness and burstiness, and most of the tunnel water bursting disaster is subjected to the comprehensive effects of multiple factors such as hydrological weather, engineering geology, artificial disturbance, construction feedback and the like, so that how to accurately predict the occurrence of the tunnel water bursting disaster in the construction period is a difficulty in the current risk assessment. The current method for predicting the tunnel water bursting disaster mainly comprises qualitative and quantitative analysis methods such as a geological investigation method, a analytic hierarchy process, a fuzzy mathematical method, a neural network algorithm, an attribute mathematical model and the like. The geological survey method ignores the relation among the water inrush indexes and can not quantify the indexes, the analytic hierarchy process has stronger subjectivity, the neural network algorithm has more sample data and difficult acquisition, and the membership function of the fuzzy mathematical method is random and variable; the attribute mathematical method measure function has uniqueness, and can solve the comprehensive evaluation problem of a plurality of fuzzy attributes. The traditional attribute measure function reflects the linear change condition of the measured value along with the attribute measure from a linear angle, but the linear change condition is not a simple linear relation between the two in actual engineering, and the accuracy of an evaluation result can be influenced by the existence of a mutation point.
The existing technical analysis starts from karst development rules, selects factors which directly influence the formation of the gushing water disaster as evaluation indexes, does not consider the influence of construction monitoring on gushing water and the change condition of indexes in different construction at different periods, and has limited applicability to tunnels with complicated geology in construction periods.
Disclosure of Invention
The invention aims to provide a gradual assessment method for sudden water disaster in a tunnel/channel construction period, which is used for establishing a sudden water assessment model suitable for two stages of construction earlier stage and construction period based on engineering hydrogeological conditions and construction measurement information, wherein the model can continuously correct the risk level of the sudden water disaster and effectively prevent the sudden water disaster in the whole construction process of the tunnel.
The technical scheme adopted by the invention is that the method for progressively evaluating the sudden water gushing disaster in the tunnel/channel construction period is implemented according to the following steps:
step 1, researching and analyzing water inrush influence factors according to geological data and construction monitoring information, and determining an inrush water evaluation index;
step 2, constructing a tunnel construction period water bursting disaster assessment index system, describing disaster causing degree of each index by adopting a qualitative and quantitative combined method, and determining grading standards;
step 3, constructing a relation function between each index attribute measure and an index measured value by adopting a nonlinear improvement attribute recognition theory according to the grading standards of different indexes;
step 4, calculating the influence degree of each index on the sudden water disaster as an objective weight, constructing a judgment matrix, calculating a subjective weight, and determining a combination weight;
step 5, pre-evaluating the water inrush disaster in the early stage of construction according to engineering geology and hydrometeorology exploration information and giving out the water inrush grade;
step 6, gradually evaluating the water inrush disaster in the construction period according to the excavation supporting state and the monitoring measurement information, and finally determining the water inrush risk level;
and 7, finally determining the water inrush risk level and predicting the water inrush amount in the construction period based on the step 6.
The invention is also characterized in that:
and step 1, researching and analyzing water inrush influence factors by using geological data and construction monitoring information, wherein the water inrush influence factors comprise engineering geological conditions, hydrological conditions, excavation supporting states and monitoring and measuring information.
Step 1 gushing water evaluation index comprises stratum lithology I 1 Formation I 2 Topography and topography I 3 Fault structural face filler I 4 Fault zone width I 5 Degree of water enrichment of groundwater I 6 Groundwater level I 7 Coefficient of rainfall infiltration I 8 Construction disturbance I 9 Supporting effect I 10 Degree of integrity I of surrounding rock 11 Osmotic pressure I of surrounding rock 12 。
Step 2, the water inrush disaster assessment index system in the tunnel construction period comprises engineering and hydrogeology B 1 And construction measurement B 2 Two classes, wherein I 1 -I 8 Is B 1 Class I 9 -I 12 Is B 2 Class.
And step 2, describing disaster causing degree of each index by adopting a qualitative and quantitative combined method and determining the concrete process of grading standard:
each index is sequentially divided into four grades I-IV according to the sequence of slightly disaster causing performance, weakly disaster causing performance, moderately disaster causing performance and strongly disaster causing performance, and the higher the disaster grade is, the stronger the disaster causing capability is;
the quantitative index is given the range of different disaster causing degrees, the qualitative index is given the range by adopting a scoring method, and the grading standard is as follows:
(1) Formation lithology I 1 The extent of disaster can be determined by the rock solubility t, and is specifically determined as follows: t is more than or equal to 0<0.042 is slightly disaster causing (grade I), t is not less than 0.042<0.104 is weak disaster causing (class II), t is not less than 0.104<0.254 is medium disaster causing (grade III), and t is more than or equal to 0.254 and is strong disaster causing (grade IV);
(2) Formation I 2 Is corrected by the inclination angle of the rock stratumDividing (I) into (I) parts (II)>Slightly disaster causing (grade I),. About.>Weak disaster causing (grade II)>Moderate disaster causing (grade III)>Strong disaster causing (grade IV);
(3) Topography and topography I 3 The extent of disaster is expressed as follows: complete slope of surface development, catchment area S<5km 2 When the score value is 0-60, the disaster causing performance (grade I) is slightly judged; steep slope land, ditch and hillock for surface development, water collecting area is 5-S<7.5km 2 When the score value is 60-70, the disaster causing performance is weak (grade II); surface development corrosion plain and gentle slope land, water collecting area is 7.5-S<10km 2 When the score value is 70-85, the disaster causing performance is medium (III grade); surface development of water falling hole, sink pit and erosion trough, water collecting area S is more than or equal to 10km 2 When the score value is 85-100 minutes, the disaster causing performance (IV level) is strong;
(4) Fault structural face filler I 4 The disaster causing degree of (a) is divided as follows: when dense filling media such as filler clay, fine sand and the like are filled, the grading value is 0-60 minutes, and the disaster is slightly caused (grade I); when the proportion of the sand grains, the fine gravel and the clay filled with the medium is approximately uniform, the grading value is 60-70 minutes, and the disaster causing performance is weak (grade II); when filling loose filling media such as broken rock, gravel soil and the like, the grading value is 70-85, and the medium disaster causing performance (grade III) is realized; when broken filling media such as broken rock, gravel, coarse sand and the like which lack fine particles are filled, the grading value is 85-100 minutes, and the disaster causing performance (IV level) is strong;
(5) Fault breaking belt width I 5 The disaster causing degree of (a) is divided as follows: b (B)<2m mini disaster causing property (grade I), 2 is less than or equal to B<5m weak disaster causing property (grade II), B is more than or equal to 5<Mid-disaster-causing property (grade III) in 8m, and strong disaster-causing property (grade IV) in which B is more than or equal to 8 m;
(6) Degree of groundwater enrichment I 6 The disaster causing degree of (2) is divided by the underground runoff modulus M, and the specific division is as follows: m is M<100m 3 /(d.km 2 ) Microdisaster (grade i); m is 100-100<1000m 3 /(d.km 2 ) Weak disaster causing (class ii); m is 1000 or less<5000m 3 /(d.km 2 ) Moderate disaster causing (grade iii); m is more than or equal to 5000M 3 /(d.km 2 ) Strong disaster causing property (IV level);
(7) Groundwater level I 7 The disaster causing degree of (a) is divided as follows: h is a<30m mini disaster causing property (grade I), h is more than or equal to 30<70m weak disaster causing property (grade II), h is more than or equal to 70<Moderate disaster causing performance (grade III) in 140m, and strong disaster causing performance (grade IV) in which h is more than or equal to 140 m;
(8) Coefficient of rainfall infiltration I 8 The disaster causing degree of (a) is divided as follows: alpha<0.15 slightly disaster causing property (grade I), alpha is not less than 0.15<Weak disaster causing performance (class II) of 0.25, alpha is not less than 0.25<0.35 medium disaster causing performance (grade III), alpha is more than or equal to 0.35 strong disaster causing performance (grade IV);
(9) Construction disturbance I 9 The disaster causing degree of (2) is specifically classified as follows: the construction score value of the TBM method or the shield method is 0 to 60 minutes, and the disaster causing performance (grade I) is slightly improved; the drilling and blasting method divides the excavation scoring value for 60-70, and the weak disaster causing property (grade II); step method excavation grading values are 70-85, and the disaster causing performance is medium (III grade); the full-section excavation grading value of the drilling and blasting method is 85-100 minutes, and the disaster causing performance (IV grade) is strong;
(10) Supporting effect I 10 The disaster causing degree of (a) is specifically expressed as follows: the second lining is finished, the wall surface is dried or water seeps and drips, the score is 0-60 minutes, and the disaster is slightly caused (grade I); finishing wall-line-shaped running water by primary support, wherein the scoring value is 60-70 minutes, and the disaster causing performance is weak (grade II); finishing wall strand running water by primary support, wherein the grading value is 70-85 minutes, and the disaster causing performance is medium (grade III); no supporting measures are taken, the scoring value is 85-100 minutes, and the disaster causing performance (IV level) is strong;
(11) Degree of surrounding rock integrity I 11 The extent of disaster is expressed as follows: rock integrity factor Kv<Micromanipulation (grade I) of 0.15, kv of 0.15 or less<Weak disaster causing performance (grade II) of 0.35, kv of 0.35 or less<Moderate disaster causing performance (grade III) of 0.55, and strong disaster causing performance (grade IV) with Kv more than or equal to 0.55;
(12) Surrounding rock osmotic pressure I 12 The disaster causing degree of (a) is divided as follows: p is p<Micromanipulation (class I) at 0.1MPa, p is not less than 0.1<Weak disaster causing performance (class II) of 0.4MPa, p is more than or equal to 0.4<Moderate disaster causing performance (grade III) under 1.0MPa, and strong disaster causing performance (grade IV) under p more than or equal to 1.0 MPa.
In the step 3, a nonlinear improved attribute recognition theory is adopted to construct a relational function expression of each index attribute measure and an index measured value as shown in table 1:
TABLE 1
Wherein mu xij And the membership degree of the j-th risk level of the i-th gushing water evaluation index is represented.
The specific process of the step 4 is as follows:
step 4.1, obtaining n cases of gushing water disasters, wherein n is not lower than 65, and counting objective weights of all indexes by combining gushing water evaluation indexes;
step 4.2, constructing a judgment matrix among the indexes according to an analytic hierarchy process, and then solving subjective weights of the indexes by using matlab according to the judgment matrix; the judgment matrix is shown in tables 2-4;
TABLE 2
| Index category | B 1 | B 2 |
| B 1 | 1 | 2 |
| B 2 | 1/2 | 1 |
TABLE 3 Table 3
| B 1 | I 1 | I 2 | I 3 | I 4 | I 5 | I 6 | I 7 | I 8 |
| I 1 | 1 | 3 | 2 | 1/2 | 1/2 | 1 | 1 | 1/2 |
| I 2 | 1/3 | 1 | 1/3 | 1/3 | 1/3 | 1/3 | 1/3 | 1/4 |
| I 3 | 1/2 | 3 | 1 | 1/3 | 1/3 | 1/2 | 1/2 | 1/2 |
| I 4 | 2 | 3 | 3 | 1 | 2 | 2 | 2 | 2 |
| I 5 | 2 | 3 | 3 | 1/2 | 1 | 2 | 2 | 2 |
| I 6 | 1 | 3 | 2 | 1/2 | 1/2 | 1 | 2 | 4 |
| I 7 | 1 | 3 | 2 | 1/2 | 1/2 | 1/2 | 1 | 3 |
| I 8 | 2 | 4 | 2 | 1/2 | 1/2 | 1/4 | 1/3 | 1 |
TABLE 4 Table 4
| B 2 | I 9 | I 10 | I 11 | I 12 |
| I 9 | 1 | 2 | 1/2 | 1/2 |
| I 10 | 1/2 | 1 | 1/2 | 1/2 |
| I 11 | 2 | 2 | 1 | 2 |
| I 12 | 2 | 2 | 1/2 | 1 |
And 4.3, taking an allocation coefficient of 0.5, and determining that the combination weight=subjective weight 0.5+objective weight 0.5, wherein the combination weights are (0.073,0.034,0.049,0.176,0.117,0.077,0.077,0.097,0.089,0.024,0.138,0.049) in sequence.
The specific process of the step 5 is as follows:
first, 8 indexes I related to engineering and hydrogeology are selected 1 -I 8 As pre-evaluation indexes, evaluating engineering hydrogeological information of paragraphs according to the requirements, and carrying out quantization value taking on each index; secondly, calculating membership mu of each index corresponding to four grades according to the valued result, the relation function of each index attribute measure and the index measured value xk The total membership degree under four grades is obtained according to the combined weight value of each index; and finally, sequentially accumulating and summing the total membership degrees from the level I to the level IV, wherein when the summation result is more than or equal to 0.60 for the first time, the corresponding grade is the pre-evaluation risk grade.
The specific process of the step 6 is as follows:
step 6.1, 12 indexes I of progressive evaluation according to the updated engineering and hydrogeological information and the construction measurement information 1 -I 12 Quantifying and taking values;
step 6.2, referring to the membership degree mu of four grades corresponding to each of the 12 indexes according to the quantized value result xk Multiplying the total membership degrees by the weight re-grading sum to obtain the total membership degree under four grades;
and 6.3, sequentially summing the total membership degrees according to the order of the grades I to IV, and ending when the summation result is more than or equal to 0.60, wherein the grade corresponding to the summation result is the progressive evaluation risk grade.
The specific process of the step 7 is as follows:
the predicted burst water amount at each risk level in the construction period is as follows: the water inflow corresponding to the disaster causing property (grade I) is<100m 3 And/d, the water inflow corresponding to the weak disaster causing property (grade II) is 100-1000 m 3 And/d, the water inflow corresponding to the medium disaster causing property (III level) is 1000-10000 m 3 The water inflow corresponding to the disaster causing property (IV level) is>10000m 3 /d。
The beneficial effects of the invention are as follows:
the gradual assessment method for the sudden water burst disasters in the tunnel/channel construction period solves the problem of sudden water burst disaster risk assessment under the construction period monitoring condition. The method utilizes engineering hydrologic exploration information to pre-evaluate the gushing water disaster in the early stage of construction and give out corresponding gushing water grades so as to formulate measures such as excavation supporting, monitoring and measuring; meanwhile, on the basis of pre-evaluation, gradually evaluating sudden water disaster possibly occurring in the construction period according to excavation monitoring information, and finally determining the risk level and predicting sudden water inflow; the assessment method is simple to operate, can be used for assessing the current construction section in actual engineering practice, and can also predict the water inrush risk possibly existing in the non-construction section.
Drawings
FIG. 1 is a flow chart of a method for progressively evaluating water inrush disasters during tunnel/roadway construction;
FIG. 2 is a graph of membership of formation lithology indicators in the method of the present invention;
FIG. 3 is a graph of formation morphology index membership in the method of the present invention;
FIG. 4 is a graph showing membership of the filling material index to the topography and fault structure surface in the method of the present invention;
FIG. 5 is a graph of fault broken belt width index membership in the method of the present invention;
FIG. 6 is a chart of membership values of groundwater water-enrichment range index in the method of the invention;
FIG. 7 is a chart of membership of groundwater level indicators in the method of the invention;
FIG. 8 is a chart of membership of rainfall infiltration coefficient indicators in the method of the present invention;
FIG. 9 is a graph of membership values of construction disturbance and support effect indicators in the method of the present invention;
FIG. 10 is a graph of the membership of the level indicators of the integrity of the surrounding rock in the method of the present invention;
FIG. 11 is a chart of membership of the osmotic pressure index of the surrounding rock in the method of the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention discloses a gradual assessment method for sudden water gushing disasters in a tunnel/channel construction period, which is shown in fig. 1 and is specifically implemented according to the following steps:
step 1, researching and analyzing water inrush influence factors according to geological data and construction monitoring information, and determining an inrush water evaluation index;
the geological data and construction monitoring information research analysis water inrush influence factors comprise engineering geological conditions, hydrological weather conditions, excavation supporting states and monitoring measurement information.
The gushing water evaluation index comprises stratum lithology I 1 Formation I 2 Topography and topography I 3 Fault structural face filler I 4 Fault zone width I 5 Degree of water enrichment of groundwater I 6 Groundwater level I 7 Coefficient of rainfall infiltration I 8 Construction disturbance I 9 Supporting effect I 10 Degree of integrity I of surrounding rock 11 Osmotic pressure I of surrounding rock 12 。
Step 2, constructing a tunnel construction period water bursting disaster assessment index system, describing disaster causing degree of each index by adopting a qualitative and quantitative combined method, and determining grading standards;
the tunnel construction period water bursting disaster assessment index system comprises engineering and hydrogeology B 1 And construction measurement B 2 Two classes, wherein I 1 -I 8 Is B 1 Class I 9 -I 12 Is B 2 Class.
The disaster causing degree of each index is described by adopting a qualitative and quantitative combined method, and the concrete process of determining the grading standard is as follows:
each index is sequentially divided into four grades I-IV according to the sequence of slightly disaster causing performance, weakly disaster causing performance, moderately disaster causing performance and strongly disaster causing performance, and the higher the disaster grade is, the stronger the disaster causing capability is;
the quantitative index is given the range of different disaster causing degrees, the qualitative index is given the range by adopting a scoring method, and the grading standard is as follows:
(1) Formation lithology I 1 The extent of disaster can be determined by the rock solubility t, and is specifically determined as follows: t is more than or equal to 0<0.042 is slightly disaster causing (grade I), t is not less than 0.042<0.104 is weak disaster causing (class II), t is not less than 0.104<0.254 is moderately disaster causing (class iii),t is more than or equal to 0.254 and is a strong disaster causing property (IV level);
(2) Formation I 2 Is corrected by the inclination angle of the rock stratumDividing (I) into (I) parts (II)>Slightly disaster causing (grade I),. About.>Weak disaster causing (grade II)>Moderate disaster causing (grade III)>Strong disaster causing (grade IV);
(3) Topography and topography I 3 The extent of disaster is expressed as follows: complete slope of surface development, catchment area S<5km 2 When the score value is 0-60, the disaster causing performance (grade I) is slightly judged; steep slope land, ditch and hillock for surface development, water collecting area is 5-S<7.5km 2 When the score value is 60-70, the disaster causing performance is weak (grade II); surface development corrosion plain and gentle slope land, water collecting area is 7.5-S<10km 2 When the score value is 70-85, the disaster causing performance is medium (III grade); surface development of water falling hole, sink pit and erosion trough, water collecting area S is more than or equal to 10km 2 When the score value is 85-100 minutes, the disaster causing performance (IV level) is strong;
(4) Fault structural face filler I 4 The disaster causing degree of (a) is divided as follows: when dense filling media such as filler clay, fine sand and the like are filled, the grading value is 0-60 minutes, and the disaster is slightly caused (grade I); when the proportion of the sand grains, the fine gravel and the clay filled with the medium is approximately uniform, the grading value is 60-70 minutes, and the disaster causing performance is weak (grade II); when filling loose filling media such as broken rock, gravel soil and the like, the grading value is 70-85, and the medium disaster causing performance (grade III) is realized; when broken filling media such as broken rock, gravel, coarse sand and the like which lack fine particles are filled, the grading value is 85-100 minutes, and the disaster causing performance (IV level) is strong;
(5) Breaking of the wireLayer breaker width I 5 The disaster causing degree of (a) is divided as follows: b (B)<2m mini disaster causing property (grade I), 2 is less than or equal to B<5m weak disaster causing property (grade II), B is more than or equal to 5<Mid-disaster-causing property (grade III) in 8m, and strong disaster-causing property (grade IV) in which B is more than or equal to 8 m;
(6) Degree of groundwater enrichment I 6 The disaster causing degree of (2) is divided by the underground runoff modulus M, and the specific division is as follows: m is M<100m 3 /(d.km 2 ) Microdisaster (grade i); m is 100-100<1000m 3 /(d.km 2 ) Weak disaster causing (class ii); m is 1000 or less<5000m 3 /(d.km 2 ) Moderate disaster causing (grade iii); m is more than or equal to 5000M 3 /(d.km 2 ) Strong disaster causing property (IV level);
(7) Groundwater level I 7 The disaster causing degree of (a) is divided as follows: h is a<30m mini disaster causing property (grade I), h is more than or equal to 30<70m weak disaster causing property (grade II), h is more than or equal to 70<Moderate disaster causing performance (grade III) in 140m, and strong disaster causing performance (grade IV) in which h is more than or equal to 140 m;
(8) Coefficient of rainfall infiltration I 8 The disaster causing degree of (a) is divided as follows: alpha<0.15 slightly disaster causing property (grade I), alpha is not less than 0.15<Weak disaster causing performance (class II) of 0.25, alpha is not less than 0.25<0.35 medium disaster causing performance (grade III), alpha is more than or equal to 0.35 strong disaster causing performance (grade IV);
(9) Construction disturbance I 9 The disaster causing degree of (2) is specifically classified as follows: the construction score value of the TBM method or the shield method is 0 to 60 minutes, and the disaster causing performance (grade I) is slightly improved; the drilling and blasting method divides the excavation scoring value for 60-70, and the weak disaster causing property (grade II); step method excavation grading values are 70-85, and the disaster causing performance is medium (III grade); the full-section excavation grading value of the drilling and blasting method is 85-100 minutes, and the disaster causing performance (IV grade) is strong;
(10) Supporting effect I 10 The disaster causing degree of (a) is specifically expressed as follows: the second lining is finished, the wall surface is dried or water seeps and drips, the score is 0-60 minutes, and the disaster is slightly caused (grade I); finishing wall-line-shaped running water by primary support, wherein the scoring value is 60-70 minutes, and the disaster causing performance is weak (grade II); finishing wall strand running water by primary support, wherein the grading value is 70-85 minutes, and the disaster causing performance is medium (grade III); no supporting measures are taken, the scoring value is 85-100 minutes, and the disaster causing performance (IV level) is strong;
(11) Degree of surrounding rock integrity I 11 The extent of disaster is expressed as follows: rock integrity factor Kv<Micromanipulation (grade I) of 0.15, kv of 0.15 or less<Weak disaster causing performance (grade II) of 0.35, kv of 0.35 or less<Moderate disaster causing performance (grade III) of 0.55, and strong disaster causing performance (grade IV) with Kv more than or equal to 0.55;
(12) Surrounding rock osmotic pressure I 12 The disaster causing degree of (a) is divided as follows: p is p<Micromanipulation (class I) at 0.1MPa, p is not less than 0.1<Weak disaster causing performance (class II) of 0.4MPa, p is more than or equal to 0.4<Moderate disaster causing performance (grade III) under 1.0MPa, and strong disaster causing performance (grade IV) under p more than or equal to 1.0 MPa.
Step 3, constructing a relation function between each index attribute measure and an index measured value by adopting a nonlinear improvement attribute recognition theory according to the grading standards of different indexes;
the relation function expression of each index attribute measure and the index measured value is constructed by adopting a nonlinear improved attribute recognition theory is shown in the table 1:
TABLE 1
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Wherein mu xij And the membership degree of the j-th risk level of the i-th gushing water evaluation index is represented.
Step 4, calculating the influence degree of each index on the sudden water disaster as an objective weight, constructing a judgment matrix, calculating a subjective weight, and determining a combination weight; the specific process is as follows:
step 4.1, obtaining n cases of gushing water disasters, wherein n is not lower than 65, and counting objective weights of all indexes by combining gushing water evaluation indexes;
step 4.2, constructing a judgment matrix among the indexes according to an analytic hierarchy process, and then solving subjective weights of the indexes by using matlab according to the judgment matrix; the judgment matrix is shown in tables 2-4;
TABLE 2
| Index category | B 1 | B 2 |
| B 1 | 1 | 2 |
| B 2 | 1/2 | 1 |
TABLE 3 Table 3
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TABLE 4 Table 4
| B 2 | I 9 | I 10 | I 11 | I 12 |
| I 9 | 1 | 2 | 1/2 | 1/2 |
| I 10 | 1/2 | 1 | 1/2 | 1/2 |
| I 11 | 2 | 2 | 1 | 2 |
| I 12 | 2 | 2 | 1/2 | 1 |
And 4.3, taking an allocation coefficient of 0.5, and determining that the combination weight=subjective weight 0.5+objective weight 0.5, wherein the combination weights are (0.073,0.034,0.049,0.176,0.117,0.077,0.077,0.097,0.089,0.024,0.138,0.049) in sequence.
Step 5, pre-evaluating the water inrush disaster in the early stage of construction according to engineering geology and hydrometeorology exploration information and giving out the water inrush grade; the specific process is as follows:
first select engineering and hydrologic landMass-related 8 indices I 1 -I 8 As pre-evaluation indexes, evaluating engineering hydrogeological information of paragraphs according to the requirements, and carrying out quantization value taking on each index; secondly, calculating membership mu of each index corresponding to four grades according to the valued result, the relation function of each index attribute measure and the index measured value xk The total membership degree under four grades is obtained according to the combined weight value of each index; and finally, sequentially accumulating and summing the total membership degrees from the level I to the level IV, wherein when the summation result is more than or equal to 0.60 for the first time, the corresponding grade is the pre-evaluation risk grade.
Step 6, gradually evaluating the water inrush disaster in the construction period according to the excavation supporting state and the monitoring measurement information, and finally determining the water inrush risk level; the specific process is as follows:
step 6.1, 12 indexes I of progressive evaluation according to the updated engineering and hydrogeological information and the construction measurement information 1 -I 12 Quantifying and taking values;
step 6.2, referring to the membership degree mu of four grades corresponding to each of the 12 indexes according to the quantized value result xk Multiplying the total membership degrees by the weight re-grading sum to obtain the total membership degree under four grades;
and 6.3, sequentially summing the total membership degrees according to the order of the grades I to IV, and ending when the summation result is more than or equal to 0.60, wherein the grade corresponding to the summation result is the progressive evaluation risk grade.
And 7, finally determining the water inrush risk level and predicting the water inrush amount in the construction period based on the step 6.
The specific process is as follows:
the predicted burst water amount at each risk level in the construction period is as follows: the water inflow corresponding to the disaster causing property (grade I) is<100m 3 And/d, the water inflow corresponding to the weak disaster causing property (grade II) is 100-1000 m 3 And/d, the water inflow corresponding to the medium disaster causing property (III level) is 1000-10000 m 3 The water inflow corresponding to the disaster causing property (IV level) is>10000m 3 /d。
Examples
The invention is exemplified by YD ZK94+621-ZK94+701 sections of a flange railway tunnel, the valley of a tunnel address area is developed, the river between mountains is numerous, the geological conditions are complex, the construction period is in a rainy season, and water burst disasters are easy to happen, and the concrete implementation steps are as follows:
step 1, determining a water inrush disaster assessment index, wherein the water inrush disaster assessment index comprises stratum lithology I 1 Formation I 2 Topography and topography I 3 Fault structural face filler I 4 Fault zone width I 5 Degree of water enrichment of groundwater I 6 Groundwater level I 7 Coefficient of rainfall infiltration I 8 Construction disturbance I 9 Supporting effect I 10 Degree of integrity I of surrounding rock 11 And the osmotic pressure I of surrounding rock 12 A total of 12 indices.
Step 2, determining a grading standard by a water inrush disaster assessment index system in a tunnel construction period, wherein the higher the grade is, the stronger the disaster causing degree is;
the index system constructed in the step 2 comprises a target layer, a criterion layer and an index layer, wherein the criterion layer is engineering and hydrogeology B 1 And construction measurement B 2 Two classes, the index layer includes I 1 -I 8 And I 9 -I 12 Two parts.
In the step 2, each index is divided into four stages according to disaster causing degree, a numerical range is given to the quantitative index, a score interval is given to the qualitative index, and the grade division standard is as follows:
(1) Formation lithology I 1 The disaster causing degree of (2) can be determined by the rock solubility t, and t is 0.ltoreq.t<Microdisaster causing property (grade I) of 0.042 and t of 0.042<Weak disaster causing performance (class II) of 0.104, t is not less than 0.104<0.254, and t is equal to or greater than 0.254, and the disaster causing performance (grade IV) is strong.
(2) Formation I 2 Is corrected by the inclination angle of the rock stratumDividing (I) into (I) parts (II)>Slightly disaster causing (grade I),. About.>Weak disasterSex (grade II), ->Moderate disaster causing (grade III)>Strong disaster causing (grade IV).
(3) Topography and topography I 3 The extent of disaster is expressed as follows: complete slope of surface development, catchment area S<5km 2 When the score value is 0-60, the disaster causing performance (grade I) is slightly judged; steep slope land, ditch and hillock for surface development, water collecting area is 5-S<7.5km 2 When the score value is 60-70, the disaster causing performance is weak (grade II); surface development corrosion plain and gentle slope land, water collecting area is 7.5-S<10km 2 When the score value is 70-85, the disaster causing performance is medium (III grade); surface development of water falling hole, sink pit and erosion trough, water collecting area S is more than or equal to 10km 2 When the score value is 85-100, the disaster causing performance (IV grade) is strong.
(4) Fault structural face filler I 4 The disaster causing degree of (a) is divided as follows: when dense filling media such as filler clay, fine sand and the like are filled, the grading value is 0-60 minutes, and the disaster is slightly caused (grade I); when the proportion of the sand grains, the fine gravel and the clay filled with the medium is approximately uniform, the grading value is 60-70 minutes, and the disaster causing performance is weak (grade II); when filling loose filling media such as broken rock, gravel soil and the like, the grading value is 70-85, and the medium disaster causing performance (grade III) is realized; when broken filling media such as broken rock, gravel, coarse sand and the like which lack fine particles are filled, the grading value is 85-100 minutes, and the disaster causing performance (IV grade) is strong.
(5) Fault breaking belt width I 5 The disaster causing degree of (a) is divided as follows: b (B)<2m mini disaster causing property (grade I), 2 is less than or equal to B<5m weak disaster causing property (grade II), B is more than or equal to 5<Moderate disaster causing performance (grade III) in 8m, and strong disaster causing performance (grade IV) in the range of B to be more than or equal to 8 m.
(6) Degree of groundwater enrichment I 6 The disaster causing degree of (2) is divided by the underground runoff modulus M, and the specific division is as follows: m is M<100m 3 /(d.km 2 ) Microdisaster (grade i); m is 100-100<1000m 3 /(d.km 2 ) Weak disaster causing (class ii); m is 1000 or less<5000m 3 /(d.km 2 ) Moderate disaster causing (III)A stage); m is more than or equal to 5000M 3 /(d.km 2 ) Strong disaster causing property (IV grade).
(7) Groundwater level I 7 The disaster causing degree of (a) is divided as follows: h is a<30m mini disaster causing property (grade I), h is more than or equal to 30<70m weak disaster causing property (grade II), h is more than or equal to 70<Moderate disaster causing performance (grade III) in 140m, and strong disaster causing performance (grade IV) in which h is more than or equal to 140 m.
(8) Coefficient of rainfall infiltration I 8 The disaster causing degree of (a) is divided as follows: alpha<0.15 slightly disaster causing property (grade I), alpha is not less than 0.15<Weak disaster causing performance (class II) of 0.25, alpha is not less than 0.25<0.35 medium disaster causing performance (grade III), and alpha is more than or equal to 0.35 strong disaster causing performance (grade IV).
(9) Construction disturbance I 9 The disaster causing degree of (2) is specifically classified as follows: the construction score value of the TBM method or the shield method is 0 to 60 minutes, and the disaster causing performance (grade I) is slightly improved; the drilling and blasting method divides the excavation scoring value for 60-70, and the weak disaster causing property (grade II); step method excavation grading values are 70-85, and the disaster causing performance is medium (III grade); the full-section excavation grading value of the drilling and blasting method is 85-100 minutes, and the disaster causing performance (IV grade) is strong.
(10) Supporting effect I 10 The disaster causing degree of (a) is specifically expressed as follows: the second lining is finished, the wall surface is dried or water seeps and drips, the score is 0-60 minutes, and the disaster is slightly caused (grade I); finishing wall-line-shaped running water by primary support, wherein the scoring value is 60-70 minutes, and the disaster causing performance is weak (grade II); finishing wall strand running water by primary support, wherein the grading value is 70-85 minutes, and the disaster causing performance is medium (grade III); no supporting measures are taken, the grading value is 85-100 minutes, and the disaster causing performance (IV grade) is strong.
(11) Degree of surrounding rock integrity I 11 The extent of disaster is expressed as follows: kv<Micromanipulation (grade I) of 0.15, kv of 0.15 or less<Weak disaster causing performance (grade II) of 0.35, kv of 0.35 or less<Moderate disaster causing performance (grade III) of 0.55, and strong disaster causing performance (grade IV) with Kv more than or equal to 0.55.
(12) Surrounding rock osmotic pressure I 12 The disaster causing degree of (a) is divided as follows: p is p<Micromanipulation (class I) at 0.1MPa, p is not less than 0.1<Weak disaster causing performance (class II) of 0.4MPa, p is more than or equal to 0.4<Moderate disaster causing performance (grade III) under 1.0MPa, and strong disaster causing performance (grade IV) under p more than or equal to 1.0 MPa.
Step 3, constructing membership relations between each index attribute measure and the measured value according to the grade division standard in the step 2, see fig. 2-11;
step 4, calculating objective weights and subjective weights of all indexes, and determining combined weights by adopting a comprehensive weighting method and taking an allocation coefficient of 0.5;
step 5, pre-evaluating the water inrush disaster in the early stage of construction according to engineering geology and hydrological exploration information, giving out water inrush grades, and providing references for the follow-up establishment of schemes such as excavation supporting, monitoring and measurement;
the specific calculation process of the sudden water disaster pre-evaluation is as follows:
according to the engineering hydrogeologic information of the section, each index is quantized and valued, and membership degrees mu corresponding to four grades of each index are searched according to figures 2-8 xk 。
(1) Formation lithology I 1 : for limestone and argillite, weak-medium salt soluble carbonate, rock solubility t=0.104, looking up fig. 2 gives a membership (0,0.5,0.5,0).
(2) Formation I 2 : the formation dip was 80 °, the corrected formation dip was 10 °, and searching fig. 3 gave a membership (0,0.5,0.5,0).
(3) Topography and topography I 3 : the ground surface is mainly characterized by corrosion peak cluster, and the surface catchment area S=12km 2 Score 85 points, looking up fig. 4 yields a membership (0,0,0.5,0.5).
(4) Fault structural face filler I 4 : the fault zone is an extrusion crushing fault, the filler is the crushing filling medium lacking fine particles, the score value is 85 minutes, and the membership degree is 0,0,0.5,0.5 after searching the figure 4.
(5) Fault breaking belt width I 5 : the fault-fracturing band width b=1.5m, looking up fig. 5 gave a membership (0.854,0.146,0,0).
(6) Degree of groundwater enrichment I 6 : surface water flow q= 91584m 3 /d, catchment area s=12 km 2 Underground runoff modulus m=q/s=7632m 3 /(d.km 2 ) Looking up FIG. 6 results in membership of (0, 1).
(7) Groundwater level I 7 : the difference h=50m between the ground water level and the tunnel floor elevation, and the membership degree (0, 1, 0) is obtained by searching the graph 7.
(8) Lowering blood pressureCoefficient of rain penetration I 8 : the rainfall infiltration coefficient α=0.4, looking up fig. 8 gives a membership degree of (0, 1).
And solving the total membership degree under the four grades according to the combined weight value to be (0.152,0.219,0.229,0.400).
And finally, sequentially accumulating and summing the total membership degrees from the grade I to the grade IV, when k is 3,the corresponding grade is grade III, namely the pre-evaluation risk grade.
Step 6, gradually evaluating the water inrush disaster in the construction period according to the excavation supporting state and the monitoring measurement information on the basis of water inrush pre-evaluation, and finally determining the water inrush risk level;
the specific calculation process for the gradual evaluation of the gushing water disaster is as follows:
step 6.1, according to the updated engineering and hydrogeology information and the construction measurement information, the progressive evaluation is carried out on the newly added 4 indexes I 9 -I 12 Quantized value and searching membership degree mu of each index corresponding to four grades according to figures 9-11 xk 。
(1) Construction disturbance I 9 : the construction adopts a micro three-step reserved core soil method, the score value is 70 minutes, and the membership degree (0,0.5,0.5,0) is obtained by searching the figure 9.
(2) Supporting effect I 10 : after secondary support is completed, water seeping through the wall surface of the drill hole, the score value is 65 minutes, and the membership degree is (0, 1, 0) obtained by searching the graph 10.
(3) Degree of surrounding rock integrity I 11 : surrounding rock is broken, the longitudinal wave speed is 1.8km/s, the integrity coefficient is 0.15, and the membership degree is 0,0,0.5,0.5 by searching the graph 11.
(4) Surrounding rock osmotic pressure I 12 : according to the osmometer monitoring information, the osmotic pressure is taken to be 0.165MPa, and the membership degree is (0, 1, 0) obtained by searching the graph 11.
According to the updated engineering and hydrogeology information and the construction measurement information, 4 indexes I which are newly added to the progressive evaluation are further estimated 1 -I 12 Quantized value and searching corresponding index according to figures 9-11Membership μ of four classes xk 。
The total membership at step 6.2, four ranks is (0.104,0.293,0.262,0.341).
And 6.3, sequentially and cumulatively summing the total membership from the level I to the level IV, wherein when k is 3, the cumulative total membership is 0.104+0.293+0.262=0.659 >0.60, so that the level III of the risk level is gradually evaluated.
And 7, determining the gushing water risk level based on the step 6, predicting the gushing water quantity in the construction period, and checking.
In the step 7, the sudden water inflow range in the construction period is predicted and checked as follows:
and (3) according to the risk grade determined in the step (6), searching a range of the corresponding sudden water inflow under the grade, and checking a prediction result according to the sudden water inflow in the engineering practice. The predicted result of the section is grade III, the predicted sudden water inflow is 1000-10000 m 3 And/d, the sudden water inflow of the section in the actual excavation process is 7000m 3 And/d, the prediction result is matched with the actual result.
The result shows that the prediction result has better accuracy and feasibility and is consistent with the existing actual construction result, so that the gradual assessment method for the sudden water disaster in the tunnel/channel construction period is described, and the occurrence of the sudden water disaster in the construction period can be accurately and rapidly predicted by combining with the existing improved mathematical model.
Claims (10)
1. The gradual assessment method for the sudden water gushing disasters in the tunnel/channel construction period is characterized by comprising the following steps of:
step 1, researching and analyzing water inrush influence factors according to geological data and construction monitoring information, and determining an inrush water evaluation index;
step 2, constructing a tunnel construction period water bursting disaster assessment index system, describing disaster causing degree of each index by adopting a qualitative and quantitative combined method, and determining grading standards;
step 3, constructing a relation function between each index attribute measure and an index measured value by adopting a nonlinear improvement attribute recognition theory according to the grading standards of different indexes;
step 4, calculating the influence degree of each index on the sudden water disaster as an objective weight, constructing a judgment matrix, calculating a subjective weight, and determining a combination weight;
step 5, pre-evaluating the water inrush disaster in the early stage of construction according to engineering geology and hydrometeorology exploration information and giving out the water inrush grade;
step 6, gradually evaluating the water inrush disaster in the construction period according to the excavation supporting state and the monitoring measurement information, and finally determining the water inrush risk level;
and 7, finally determining the water inrush risk level and predicting the water inrush amount in the construction period based on the step 6.
2. The method for progressively evaluating the water inrush disaster during tunnel/tunnel construction according to claim 1, wherein the geological data and construction monitoring information investigation and analysis of water inrush influence factors comprises four parts of engineering geological conditions, hydrological meteorological conditions, excavation supporting states and monitoring measurement information.
3. The method for progressively evaluating a gushing water disaster during tunnel/roadway construction according to claim 1, wherein the gushing water evaluation index comprises formation lithology I 1 Formation I 2 Topography and topography I 3 Fault structural face filler I 4 Fault zone width I 5 Degree of water enrichment of groundwater I 6 Groundwater level I 7 Coefficient of rainfall infiltration I 8 Construction disturbance I 9 Supporting effect I 10 Degree of integrity I of surrounding rock 11 Osmotic pressure I of surrounding rock 12 。
4. The gradual assessment method for water inrush disaster in tunnel/tunnel construction period according to claim 3, wherein the tunnel construction period water inrush disaster assessment index system in step 2 comprises engineering and hydrogeology B 1 And construction measurement B 2 Two classes, wherein I 1 -I 8 Is B 1 Class I 9 -I 12 Is B 2 Class.
5. The method for progressively evaluating a sudden water gushing disaster in a tunnel/road construction period according to claim 3, wherein the specific process of describing disaster causing degree of each index and determining grading standard by adopting a qualitative and quantitative combined method in step 2 is as follows:
each index is sequentially divided into four grades I-I according to the sequence of slightly disaster causing performance, weakly disaster causing performance, moderately disaster causing performance and strongly disaster causing performance, and the higher the disaster grade is, the stronger the disaster causing capability is;
the quantitative index is given the range of different disaster causing degrees, the qualitative index is given the range by adopting a scoring method, and the grading standard is as follows:
(1) Formation lithology I 1 The extent of disaster can be determined by the rock solubility t, and is specifically determined as follows: t is more than or equal to 0<0.042 is slightly disaster causing (grade I), t is not less than 0.042<0.104 is weak disaster causing (class II), t is not less than 0.104<0.254 is medium disaster causing (grade III), and t is more than or equal to 0.254 and is strong disaster causing (grade I);
(2) Formation I 2 Is corrected by the inclination angle of the rock stratumDividing (I) into (I) parts (II)>Slightly disaster causing (grade I),. About.>Weak disaster causing (grade II)>Moderate disaster causing (grade III)>Strong disaster causing (grade I);
(3) Topography and topography I 3 The extent of disaster is expressed as follows: complete slope of surface development, catchment area S<5km 2 When the score value is 0-60, the disaster causing performance (grade I) is slightly judged; steep slope land, ditch and hillock for surface development, water collecting area is 5-S<7.5km 2 When the score value is 60-70, the disaster causing performance is weak (grade II); surface development corrosion plain and gentle slope land, water collecting area is 7.5-S<10km 2 When the score value is 70-85, the disaster causing performance is medium (III grade); surface development of water falling hole, sink pit and erosion trough, water collecting area S is more than or equal to 10km 2 When the score value is 85-100, the disaster causing performance (grade I) is strong;
(4) Fault structural face filler I 4 The disaster causing degree of (a) is divided as follows: when the filler clay and fine sand are densely filled into the medium, the grading value is 0-60 minutes, and the disaster is slightly caused (grade I); when the proportion of the sand grains, the fine gravel and the clay filled with the medium is approximately uniform, the grading value is 60-70 minutes, and the disaster causing performance is weak (grade II); when filling loose filling media such as broken rock, gravel soil and the like, the grading value is 70-85, and the medium disaster causing performance (grade III) is realized; when broken filling media such as broken rock, gravel, coarse sand and the like which lack fine particles are filled, the grading value is 85-100 minutes, and the disaster causing performance (grade I) is strong;
(5) Fault breaking belt width I 5 The disaster causing degree of (a) is divided as follows: b (B)<2m mini disaster causing property (grade I), 2 is less than or equal to B<5m weak disaster causing property (grade II), B is more than or equal to 5<Mid-disaster-causing performance (grade III) in 8m, and strong disaster-causing performance (grade I) in which B is more than or equal to 8 m;
(6) Degree of groundwater enrichment I 6 The disaster causing degree of (2) is divided by the underground runoff modulus M, and the specific division is as follows: m is M<100m 3 /(d.km 2 ) Microdisaster (grade i); m is 100-100<1000m 3 /(d.km 2 ) Weak disaster causing (class ii); m is 1000 or less<5000m 3 /(d.km 2 ) Moderate disaster causing (grade iii); m is more than or equal to 5000M 3 /(d.km 2 ) Time-critical disaster causing property (grade I);
(7) Groundwater level I 7 The disaster causing degree of (a) is divided as follows: h is a<30m mini disaster causing property (grade I), h is more than or equal to 30<70m weak disaster causing property (grade II), h is more than or equal to 70<Moderate disaster causing performance (grade III) in 140m, and strong disaster causing performance (grade I) in which h is more than or equal to 140 m;
(8) Coefficient of rainfall infiltration I 8 The disaster causing degree of (a) is divided as follows: alpha<0.15 slightly disaster causing property (grade I), alpha is not less than 0.15<0.25 weak disaster causing property (grade II), alpha is 0.25 or less<0.35 medium disaster causing performance (grade III), alpha is more than or equal to 0.35 strong disaster causing performance (grade I);
(9) Construction disturbance I 9 The disaster causing degree of (2) is specifically classified as follows: the construction score value of the TBM method or the shield method is 0 to 60 minutes, and the disaster causing performance (grade I) is slightly improved; the drilling and blasting method divides the excavation scoring value for 60-70, and the weak disaster causing property (grade II); step method excavation grading values are 70-85, and the disaster causing performance is medium (III grade); the full-section excavation grading value of the drilling and blasting method is 85-100, and the disaster causing performance (grade I) is strong;
(10) Supporting effect I 10 The disaster causing degree of (a) is specifically expressed as follows: the second lining is finished, the wall surface is dried or water seeps and drips, the score is 0-60 minutes, and the disaster is slightly caused (grade I); finishing wall-line-shaped running water by primary support, wherein the scoring value is 60-70 minutes, and the disaster causing performance is weak (grade II); finishing wall strand running water by primary support, wherein the grading value is 70-85 minutes, and the disaster causing performance is medium (grade III); no supporting measures are taken, the grading value is 85-100 minutes, and the disaster causing performance (grade I) is enhanced;
(11) Degree of surrounding rock integrity I 11 The extent of disaster is expressed as follows: rock integrity factor Kv<Micromanipulation (grade I) of 0.15, kv of 0.15 or less<Weak disaster causing performance (grade II) of 0.35, kv of 0.35 or less<Moderate disaster causing performance (grade III) of 0.55, and strong disaster causing performance (grade I) with Kv more than or equal to 0.55;
(12) Surrounding rock osmotic pressure I 12 The disaster causing degree of (a) is divided as follows: p is p<Micromanipulation (class I) at 0.1MPa, p is not less than 0.1<Weak disaster causing performance (class II) of 0.4MPa, p is more than or equal to 0.4<Moderate disaster causing performance (grade III) under 1.0MPa, and strong disaster causing performance (grade I) under p more than or equal to 1.0 MPa.
6. The gradual assessment method for sudden water gushing disasters in tunnel/channel construction period according to claim 1, wherein in step 3, a relation function expression of each index attribute measure and an index measured value is constructed by adopting a nonlinear improvement attribute recognition theory as shown in table 1:
TABLE 1
Wherein mu xij And the membership degree of the j-th risk level of the i-th gushing water evaluation index is represented.
7. The gradual assessment method for sudden water gushing disasters in tunnel/road construction period according to claim 3, wherein the specific process of the step 4 is as follows:
step 4.1, obtaining n cases of gushing water disasters, wherein n is not lower than 65, and counting objective weights of all indexes by combining gushing water evaluation indexes;
step 4.2, constructing a judgment matrix among the indexes according to an analytic hierarchy process, and then solving subjective weights of the indexes by using matlab according to the judgment matrix; the judgment matrix is shown in tables 2-4;
TABLE 2
TABLE 3 Table 3
TABLE 4 Table 4
And 4.3, taking an allocation coefficient of 0.5, and determining that the combination weight=subjective weight 0.5+objective weight 0.5, wherein the combination weights are (0.073,0.034,0.049,0.176,0.117,0.077,0.077,0.097,0.089,0.024,0.138,0.049) in sequence.
8. The gradual assessment method for sudden water gushing disasters in tunnel/road construction period according to claim 3, wherein the specific process of the step 5 is as follows:
first, 8 indexes I related to engineering and hydrogeology are selected 1 -I 8 As pre-evaluation indexes, evaluating engineering hydrogeological information of paragraphs according to the requirements, and carrying out quantization value taking on each index; secondly, calculating membership mu of each index corresponding to four grades according to the valued result, the relation function of each index attribute measure and the index measured value xk The total membership degree under four grades is obtained according to the combined weight value of each index; and finally, sequentially accumulating and summing the total membership degrees from the level I to the level I, wherein when the summation result is more than or equal to 0.60 for the first time, the corresponding level is the pre-evaluation risk level.
9. The gradual assessment method for sudden water gushing disasters in tunnel/road construction period according to claim 3, wherein the specific process of the step 6 is as follows:
step 6.1, 12 indexes I of progressive evaluation according to the updated engineering and hydrogeological information and the construction measurement information 1 -I 12 Quantifying and taking values;
step 6.2, referring to the membership degree mu of four grades corresponding to each of the 12 indexes according to the quantized value result xk Multiplying the total membership degrees by the weight re-grading sum to obtain the total membership degree under four grades;
and 6.3, sequentially summing the total membership degrees according to the order of the levels I to I, and ending when the summation result is more than or equal to 0.60, wherein the corresponding level is the progressive evaluation risk level.
10. The gradual assessment method for sudden water gushing disasters in tunnel/road construction period according to claim 1, wherein the specific process of the step 7 is as follows:
the predicted burst water amount at each risk level in the construction period is as follows: the water inflow corresponding to the disaster causing property (grade I) is<100m 3 And/d, the water inflow corresponding to the weak disaster causing property (grade II) is 100-1000 m 3 And/d, the water inflow corresponding to the medium disaster causing property (III level) is 1000-10000 m 3 The water inflow corresponding to the disaster causing property (level I) is>10000m 3 /d。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117711140A (en) * | 2024-02-06 | 2024-03-15 | 山东大学 | Tunnel water bursting disaster timing early warning method and system based on multi-source data fusion |
| CN117726182A (en) * | 2024-02-07 | 2024-03-19 | 山东大学 | Multi-stage tunnel crossing difficult stratum gushing water disaster risk prediction method and system |
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2023
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117711140A (en) * | 2024-02-06 | 2024-03-15 | 山东大学 | Tunnel water bursting disaster timing early warning method and system based on multi-source data fusion |
| CN117726182A (en) * | 2024-02-07 | 2024-03-19 | 山东大学 | Multi-stage tunnel crossing difficult stratum gushing water disaster risk prediction method and system |
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