CN117493754B - Comprehensive determination method for anti-floating fortification water level - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 365
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000003673 groundwater Substances 0.000 claims abstract description 118
- 238000012544 monitoring process Methods 0.000 claims abstract description 57
- 230000007123 defense Effects 0.000 claims abstract description 19
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- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 claims description 3
- 239000002689 soil Substances 0.000 description 32
- 239000004927 clay Substances 0.000 description 16
- 239000000843 powder Substances 0.000 description 10
- 238000005553 drilling Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 3
- 238000012163 sequencing technique Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 239000005442 atmospheric precipitation Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention discloses a comprehensive determination method of an anti-floating waterproof level, and relates to the technical field of geotechnical engineering investigation. The invention comprises the following steps: s1: acquiring existing groundwater level monitoring data F n The method comprises the steps of carrying out a first treatment on the surface of the S2: obtaining the highest water level F max Minimum water level F min Average water level value F mid A water level difference H; s3: calculating groundwater level monitoring data F n An overrun probability value greater than or equal to the lower limit value of any equal-section groundwater levelThe method comprises the steps of carrying out a first treatment on the surface of the S4: calculating the anti-floating basic water level F of the field b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h The method comprises the steps of carrying out a first treatment on the surface of the S5: and determining an anti-floating defense level, and matching the anti-floating defense level according to the anti-floating defense level. The anti-floating water level obtained by the method is more in accordance with the change rule of the groundwater water level, and the anti-floating water level is estimated more conveniently and reasonably.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering investigation, in particular to a comprehensive determination method for an anti-floating defense water level in geotechnical engineering investigation.
Background
The anti-floating water level is generally divided into temporary engineering anti-floating water level and permanent engineering anti-floating water level. At present, the determination of the two anti-floating defense water levels in China is generally determined according to local experience, or is determined by the highest historical water level value of a site or is determined by special hydrogeology investigation and demonstration. When the place experience is adopted or the place history highest water level value is adopted, the following defects exist, specifically, because the two modes of determining the anti-floating water level are compared on one side, the situation that the determined anti-floating water level is higher or lower easily occurs, and when the determined anti-floating water level is higher, serious waste is caused in anti-floating design of a later-stage building (structure); when the determined anti-floating waterproof level is lower, the anti-floating safety of the building (structure) is damaged; when the special hydrogeology investigation and demonstration are adopted for determination, the problems of long time consumption and large consumption of manpower and material resources exist. Therefore, the applicant provides a comprehensive determination method with more reasonable anti-floating water level estimation and simpler estimation mode.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a comprehensive determination method for an anti-floating defense water level in geotechnical engineering investigation.
The technical scheme of the invention is as follows:
a comprehensive determination method of anti-floating defense water level is characterized in that: the method comprises the following steps:
s1: acquiring ground water level monitoring data F of a field existing in near n years n ；
S2: monitoring data F from groundwater level n In the process, the highest water level F is obtained max Minimum water level F min Average water level value F mid A water level difference H; let the average water level value F mid Is the water level F in the ground water which resists floating for nearly n years z I.e.；
S3: monitoring the ground water levelF n Sequencing from small to large, and changing the interval F min ～F max Dividing into 2m equal segments; then, the ground water level monitoring data F which respectively fall into 2m equal segments are counted n Number N of (2) n And groundwater level monitoring data F n Probability values K respectively falling within 2m equal segments n The method comprises the steps of carrying out a first treatment on the surface of the Make ground water level monitor data F n The exceeding probability value of the lower limit value of any equal-section ground water level isAnd calculate +.>A value;
s4: defining an override probability value3%, 10% and 63% respectively, < + >>The probability values of the anti-floating anti-rare water level are respectively +.>Anti-floating defense basic water level probability value +.>The probability value of water level for anti-floating fortification>Then, according to the probability distribution function of Poisson distribution, the equivalent fortification probability P of anti-fortification water level, anti-fortification basic water level and anti-fortification water level is calculated respectively h 、P b 、P d Then, obtaining a corresponding water level change value S through interpolation calculation h 、S b 、S d Then according to the water level change value S h 、S b 、S d And the water level F in the anti-floating groundwater of nearly n years z Respectively calculating the anti-floating basic water level F of the field b Anti-floating fortification multi-meeting water level F d Anti-floatingSetting the water level F h ；
S5: according to the anti-floating technical standard of building engineering, JGJ476-2019, the anti-floating protection grade of temporary engineering and permanent engineering is determined, and the basic anti-floating protection water level F is matched according to the anti-floating protection grade b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h ；
S6: the temporary engineering and the permanent engineering are determined to be anti-floating waterproof level F f (wherein F) f For resisting floating and defending the basic water level F b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h One of the values of (2) and the highest stable water level F during investigation k Comparing the sizes to obtain the final anti-floating waterproof level。
Preferably, in S1, the existing ground water level monitoring data F of the field is acquired for nearly n years n When the anti-floating water level of the temporary engineering needs to be determined, the value of n is not less than 5, and when the anti-floating water level of the permanent engineering needs to be determined, the value of n is not less than 20.
Preferably, in S2, the water level difference H is the highest water level F max And the lowest water level F min Is a difference in (c).
Preferably, in step S3, a calculation formula of the interval size Q of equal segments is as shown in formula (1):
（1）
in the formula (1), H is the highest water level F max And the lowest water level F min 2m represents the number of equal segments, m represents half the number of equal segments, and Q represents a section size value of one equal segment.
Preferably, in step S3, each of the equally segmented groundwater level monitoring data F n The range value of (2) is shown in the formula,
（2）
in the formula (2), F n For groundwater level monitoring data, F z Is the water level of the anti-floating groundwater in the field for nearly n years, H is the highest water level F max And the lowest water level F min M represents half the number of equal segments, x is a natural number from 0 to 2 m.
Preferably, in step S3, the groundwater level monitoring data F n Probability values K respectively falling within 2m equal segments n The calculation formula of (2) is shown as formula (4):
（4）
in the formula (4), N n Representing groundwater level monitoring data F falling respectively within 2m aliquots n Is the number of (3); n is the existing ground water level monitoring data F of nearly N years n Is a total number of (a) in the number of (a).
Preferably, in step S3, an override probability value is calculatedThe calculation formula of the value is shown as formula (5):
（5）
in the formula (5), K n Representing groundwater level monitoring data F n Probability values falling within 2m equal segments, respectively, m representing half the number of equal segments, x being a natural number from 0 to 2 m.
Preferably, in step S3, the m value is obtained in the manner shown in the formula (3):
（3）
in the formula (3), H represents a water level difference, m is a positive integer greater than or equal to 1,the representation is rounded up.
Preferably, step S4 is specifically: defining an overrun probability value when the design service life of the temporary engineering and the permanent engineering is MThe corresponding water level is the anti-floating basic water level F b Defining a transcendental probability value->The corresponding water level is the anti-floating fortification most meeting water level F d Defining a transcendental probability value->The corresponding water level is the anti-floating anti-rare water level F h The method comprises the steps of carrying out a first treatment on the surface of the When exceeding the probability value->When in use, let->For anti-floating anti-rare water level probability value ++>When exceeding the probability value->When in use, let->Basic water level probability value for anti-floating fortification>When exceeding the probability value->Time, orderThe probability value of water level is +.>Then, the equivalent fortification probability P of the anti-fortification water level, the anti-fortification basic water level and the anti-fortification water level is calculated respectively according to the probability distribution function of the Poisson distribution h 、P b 、P d The method comprises the steps of carrying out a first treatment on the surface of the Then, based on the calculated equivalent fortification probability P h 、P b 、P d Then, obtaining the equivalent fortification probability P respectively through interpolation calculation h 、P b 、P d The water level change value S of the anti-floating anti-rare water level, the anti-floating basic water level and the anti-floating anti-multi-water level respectively corresponding to each other h 、S b 、S d Then based on the anti-floating anti-rare water level, the anti-floating basic water level and the water level change value S of the anti-floating anti-multi-water level h 、S b 、S d And the water level F in the anti-floating groundwater of nearly n years z Respectively calculating the anti-floating basic water level F of the field b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h 。
Preferably, in step S4, the probability distribution function of poisson distribution is as shown in equations (9), (10) and (11):
（9）
（10）
（11）
in the formulas (9) to (11), n represents the existing groundwater level monitoring data F n The years of the project, M, represents the design service life of the temporary project and the permanent project; defining an override probability valueWhen (I)>For resisting floating and preventing rare water level probability valueIn formula (9), a ++>For 3%, define override probability value +.>When (I)>For resisting floating setting of basic water level probability valueIn formula (10)>For 10%, define override probability value +.>When (I)>The probability value of water level is +.>In formula (11)>63%.
Preferably, in step S4, the equivalent fortification probability P based on the anti-floating forthcoming water level is realized by using the formula (12) h Obtaining a corresponding anti-floating anti-rare water level change value S through interpolation calculation h ：
（12）
In the formula (12), P i、 P i-1 Respectively ground water level monitoringData F n Two adjacent probability values of a certain equal segment lower limit data are larger than or equal to each other, S i 、S i-1 Respectively represent and P i、 P i-1 Corresponding water level change value, i epsilon (1, 2 m);
in step S4, an equivalent fortification probability P based on the anti-floating fortification base water level is realized by using the formula (13) b Obtaining a corresponding anti-floating basic water level change value S through interpolation calculation b ：
（13）
In the formula (13), P j、 P j-1 Respectively the ground water level monitoring data F n Two adjacent probability values of a certain equal segment lower limit data are larger than or equal to each other, S j 、S j-1 Respectively represent and P j、 P j-1 Corresponding water level change value j epsilon (1, 2 m);
in the step S4, the equivalent fortification probability P based on the anti-floating fortification multi-meeting water level is realized by utilizing the step (14) d The corresponding anti-floating fortification multi-meeting water level change value S is obtained through interpolation calculation d ：
（14）
In the formula (14), P k、 P k-1 Respectively the ground water level monitoring data F n Two adjacent probability values of a certain equal segment lower limit data are larger than or equal to each other, S k、 S k-1 Respectively represent and P k、 P k-1 Corresponding water level change value, k epsilon (1, 2 m).
Preferably, the groundwater level monitoring data F is monitored before the difference value is calculated n An overrun probability value greater than or equal to the lower limit value of each equal-section ground water levelAndAnd override probability value->Corresponding water level change value S n And respectively carrying out statistics.
Preferably, in step S4, the anti-floating basic water level F of the site is calculated by using the formulas (6), (7) and (8), respectively b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h ；
（6）
（7）
（8）
In the formula (6), F b Represents the anti-floating defense basic water level, F z Represents the water level in the anti-floating groundwater of the field for nearly n years, S b A water level change value representing an anti-floating basic water level;
in the formula (7), F d Represents the anti-floating fortification water level which is more encountered, F z Represents the water level in the anti-floating groundwater of the field for nearly n years, S d A water level change value representing the water level which is more likely to be subjected to anti-floating fortification;
in the formula (8), F h Represents the anti-floating anti-rare water level, F z A water level change value S for representing the water level of the anti-floating groundwater in the field for nearly n years, and the anti-floating anti-rare water level h 。
Preferably, step S5 is specifically: the specific modes of determining the anti-floating protection grades of the temporary engineering and the permanent engineering and matching the anti-floating protection water level according to the anti-floating protection grades are as follows: when the anti-floating protection level is the first level, the anti-floating protection water level adopts the anti-floating anti-rare water level F h When the anti-floating fortification level is level B, the anti-floating fortification level is anti-floatingBasic water level F for fortification b When the anti-floating fortification level is level C, the anti-floating fortification level adopts the anti-floating fortification level F which is more than the water level F when the anti-floating fortification level is level C d 。
Compared with the prior art, the invention has the beneficial technical effects that
1. The comprehensive determination method of the anti-floating water level provided by the invention avoids the situation that the highest historical water level of the field is selected as the anti-floating water level in a plurality of survey reports at present, and serious waste of the anti-floating design of the building (construction) is caused;
2. according to the method, the ground water level rising probability is considered according to normal distribution by combining with the historical water level data of the field, so that the ground water level rising probability is more in accordance with the actual change rule of the ground water level, the temporary engineering and permanent engineering anti-floating defense water level comprehensive determination method provided by the application is more in accordance with the change rule of the ground water level, the anti-floating defense water level estimation is simpler and more convenient, the method can be used as a reasonable basis for the design of the temporary engineering and permanent engineering anti-floating defense water level, unnecessary engineering waste is fully avoided, and anti-floating safety accidents are also effectively avoided.
Drawings
FIG. 1 is a representative geological section of a field for a particular engineering application in the present application;
FIG. 2 is a graph of groundwater level change over 20 years in a field of a specific engineering application in the present application;
in FIG. 1, the numbers (1) to (5) respectively indicate the stratum numbers of the layer of soil, and the shaded areas are illustrations of the layer of soil, wherein (1) is a hybrid fill layer, (2) is a silty layer, (3) is a silty layer, and (3) 1 A powder clay layer sandwiched in the powder clay layer (3), and (3) 2 A clay layer sandwiched in the powder layer (3), a powdery clay layer (4), and a powder clay layer (4) 1 A powder clay layer sandwiched by (4) powder clay layers, (4) 2 A silt layer sandwiched by (4) silt clay layers, (4) 3 Fine sand layer sandwiched by (4) powdery clay layer, (5) 1 A silty layer sandwiched between (5) silty clay layers; (2) (3), (4) 1 、⑤ 1 Although the soil layers are all silt layers, the physical and mechanical parameters are inconsistent; (3) 1 、④、(5) although the clay layers are all powdery clay layers, the physical and mechanical parameters are inconsistent;
in fig. 1, the number 0.80 (29.57): 0.80 represents the layering depth of the layer of soil, () the internal numeral 29.57 represents the elevation corresponding to the layering depth of 0.80 of the layer of soil;
number 5.20 (25.17): 5.20 represents the layering depth of the layer of soil, and the number 25.17 in the () represents the elevation corresponding to the layering depth of 5.20 of the layer of soil;
number 8.80 (21.57): 8.80 represents the layering depth of the layer of soil, and the number 21.57 in the () represents the elevation corresponding to the layering depth of 8.80 of the layer of soil;
number 9.60 (20.77): 9.60 represents the layering depth of the layer of soil, and the number 20.77 in the () represents the elevation corresponding to the layering depth of the layer of soil of 9.60;
number 11.50 (18.87): 11.50 represents the layering depth of the layer of soil, and the number 18.87 in the () represents the elevation corresponding to the layering depth of the layer of soil of 11.50;
number 12.00 (18.37): 12.00 represents the layering depth of the layer soil, and the number 18.37 in the ()'s represents the elevation corresponding to the layering depth of the layer soil of 12.00;
number 16.80 (13.57): 16.80 represents the layering depth of the layer of soil, and the number 13.57 in the () represents the elevation corresponding to the layering depth of the layer of soil of 16.80;
number 20.20 (10.17): 20.20 represents the layering depth of the layer of soil, and the number 10.17 in the () represents the elevation corresponding to the layering depth of the layer of soil of 20.20;
number 22.50 (7.87): 22.50 represents the layering depth of the layer of soil, and the number 7.87 in the () represents the elevation corresponding to the layering depth of the layer of soil of 22.50;
number 23.00 (7.37): 23.00 represents the layering depth of the layer soil, and the number 7.37 in the () represents the elevation corresponding to the layering depth of the layer soil of 23.00;
number 33.00 (-2.63): 33.00 the layering depth of the layer of soil, () the inner number-2.63 represents the elevation corresponding to the layering depth 33.00 of the layer of soil;
indicating number 104 drill hole, drill holeThe orifice elevation of (2) is 30.50m;
138 holes are shown, and the hole elevation of the holes is 30.78m;
the 105 # drilling is represented, and the orifice elevation of the drilling is 30.37m;
the method is characterized by comprising the following steps of representing a No. 106 drilling, wherein the elevation of an orifice of the drilling is 30.67m;
a No. 107 drill hole is represented, and the hole elevation of the drill hole is 29.42m;
Detailed Description
The comprehensive determination method of the anti-floating defense water level specifically comprises the following steps:
s1: acquiring ground water level monitoring data F of a field existing in near n years n When the anti-floating water level of the temporary engineering needs to be determined, the value of n is not less than 5, and when the anti-floating water level of the permanent engineering needs to be determined, the value of n is not less than 20;
s2: monitoring data F from groundwater level n In the process, the highest water level F is obtained max Minimum water level F min Average water level value F mid And a water level difference H, wherein the highest water level F max For groundwater level monitoring data F n Maximum value of (F), minimum water level F min For groundwater level monitoring data F n Minimum value of (2), mean water level value F mid For groundwater level monitoring data F n The water level difference H is the highest water level F max And the lowest water level F min To make the average water level value F mid Is the water level F in the ground water which resists floating for nearly n years z I.e.；
S3: monitoring the groundwater level data F n Sequencing from small to large, and changing the interval F min ～F max The method is divided into 2m equal segments, and the calculation formula of the interval size value Q of one equal segment is shown as the formula (1):
（1）
in the formula (1), H is the highest water level F max And the lowest water level F min 2m represents the number of equal segments, m represents half of the number of equal segments, Q represents a section size value of an equal segment;
then, the ground water level monitoring data F which respectively fall into 2m equal segments are counted n Number N of (2) n And groundwater level monitoring data F n Probability values respectively falling into 2m equal segments, ground water level monitoring data F of each equal segment n The range value of (2) is shown in the formula,
（2）
in the formula (2), F n For groundwater level monitoring data, F z Is the water level of the anti-floating groundwater in the field for nearly n years, H is the highest water level F max And the lowest water level F min M represents half the number of equal segments, x is a natural number from 0 to 2m;
in step S3, the m value is obtained according to the formula (3):
（3）
in the formula (3), H represents a water level difference, m is a positive integer greater than or equal to 1,the representation is rounded up;
and the 2m equal segments are specifically represented by the following formula:
in the above formula, F n For groundwater level monitoring data, F z Is the water level of the anti-floating groundwater in the field for nearly n years, H is the highest water level F max And the lowest water level F min M represents half of the number of equal segments, x is a natural number from 0 to 2m;
ground water level monitoring data F n Probability values K respectively falling within 2m equal segments n The calculation formula of (2) is shown as formula (4):
（4）
in the formula (4), N n Representing groundwater level monitoring data F falling respectively within 2m aliquots n Is the number of (3); n is the existing ground water level monitoring data F of nearly N years n Is the total number of (3);
make ground water level monitor data F n The exceeding probability value of the lower limit value of any equal-section ground water level is，/>The calculation formula of (2) is shown as formula (5):
（5）
in the formula (5), K n Representing groundwater level monitoring data F n Probability values respectively falling into 2m equal segments, m represents half of the number of the equal segments, and x is a natural number of 0 to 2m;
s4: when the design service life of the temporary engineering and the permanent engineering is M, the probability value isDefinition +.>The corresponding water level is the anti-floating basic water level F b When probability value->Definition of timeThe corresponding water level is the anti-floating fortification most meeting water level F d When probability value->Definition of timeThe corresponding water level is the anti-floating anti-rare water level F h ；
When the probability valueWhen in use, let->For anti-floating anti-rare water level probability value ++>When the probability value isWhen in use, let->Basic water level probability value for anti-floating fortification>When probability value->When in use, let->The probability value of water level is +.>Then, the equivalent fortification probability P of the anti-fortification water level, the anti-fortification basic water level and the anti-fortification water level is calculated respectively according to the probability distribution function of the Poisson distribution h 、P b 、P d The method comprises the steps of carrying out a first treatment on the surface of the Then, based on the calculated equivalent fortification probability P h 、P b 、P d Then, obtaining the equivalent fortification probability P respectively through interpolation calculation h 、P b 、P d The water level change value S of the anti-floating anti-rare water level, the anti-floating basic water level and the anti-floating anti-multi-water level respectively corresponding to each other h 、S b 、S d Then, calculating the anti-floating basic water level F of the field by using the formula (6), the formula (7) and the formula (8) b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h ；
（6）
（7）
（8）
In the formula (6), F b Represents the anti-floating defense basic water level, F z Represents the water level in the anti-floating groundwater of the field for nearly n years, S b Water level representing anti-floating basic water levelA variation value;
in the formula (7), F d Represents the anti-floating fortification water level which is more encountered, F z Represents the water level in the anti-floating groundwater of the field for nearly n years, S d A water level change value representing the water level which is more likely to be subjected to anti-floating fortification;
in the formula (8), F h Represents the anti-floating anti-rare water level, F z Represents the water level in the anti-floating groundwater of the field for nearly n years, S h A water level change value representing an anti-floating anti-rare water level;
to facilitate the calculation of the difference value, the present application monitors the groundwater level monitoring data F n An overrun probability value greater than or equal to the lower limit value of each equal-section ground water levelAnd probability value->Corresponding water level change value S n Statistics were performed separately as shown in table 1:
TABLE 1
In this application, the calculation formula of the equivalent fortification probability in step S4 is as shown in formulas (9), (10) and (11):
（9）
（10）
（11）
in the formulas (9) to (11), n represents the existing groundwater level monitoring data F n And M represents temporary engineeringThe design service life of permanent engineering; defining an override probability valueWhen (I)>For resisting floating and preventing rare water level probability valueIn formula (9), a ++>3%; defining a transcendental probability value->When (I)>For resisting floating setting of basic water level probability valueIn formula (10)>10%; defining a transcendental probability value->When (I)>To resist floating fortification and meet the probability value of water levelIn formula (11)>63%.
In the step S4 of the application, the equivalent fortification probability P based on the anti-floating fortification water level is realized by utilizing the step (12) h Obtaining a corresponding anti-floating anti-rare water level change value S through interpolation calculation h ：
（12）
In the formula (12), P i 、P i-1 Respectively the ground water level monitoring data F n Two adjacent probability values of a certain equal segment lower limit data are larger than or equal to each other, S i 、S i-1 Respectively represent and P i 、P i-1 Corresponding water level change value, i epsilon (1, 2 m);
in step S4, an equivalent fortification probability P based on the anti-floating fortification base water level is realized by using the formula (13) b Obtaining a corresponding anti-floating basic water level change value S through interpolation calculation b ：
（13）
In the formula (13), P j 、P j-1 Respectively the ground water level monitoring data F n Two adjacent probability values of a certain equal segment lower limit data are larger than or equal to each other, S j 、S j-1 Respectively represent and P j 、P j-1 Corresponding water level change value j epsilon (1, 2 m);
in the step S4, the equivalent fortification probability P based on the anti-floating fortification multi-meeting water level is realized by utilizing the step (14) d The corresponding anti-floating fortification multi-meeting water level change value S is obtained through interpolation calculation d ：
（14）
In the formula (14), P k 、P k-1 Respectively the ground water level monitoring data F n Two adjacent probability values of a certain equal segment lower limit data are larger than or equal to each other, S k 、S k-1 Respectively represent and P k 、P k-1 Corresponding water level change value, k epsilon (1, 2 m).
S5: according to buildingEngineering anti-floating technical standard JGJ476-2019, determining anti-floating protection grades of temporary engineering and permanent engineering, and selecting an anti-floating protection water level matched with the temporary engineering and permanent engineering according to the anti-floating protection grade, specifically, when the anti-floating protection grade is grade A, the anti-floating protection water level adopts an anti-floating protection rare water level F h When the anti-floating fortification level is level B, the anti-floating fortification water level adopts an anti-floating fortification basic water level F b When the anti-floating fortification level is level C, the anti-floating fortification level adopts the anti-floating fortification level F which is more than the water level F when the anti-floating fortification level is level C d 。
S6: the temporary engineering and the permanent engineering are determined to be anti-floating waterproof level F f (wherein F) f For resisting floating and defending the basic water level F b Anti-floating fortification multi-meeting water level F d And anti-floating anti-rare water level F h One of the values) and the highest stable water level F during investigation k Comparing the sizes to obtain the final anti-floating waterproof level。
Furthermore, override probability values are defined in this applicationWhen (I)>For anti-floating anti-rare water level probability value ++>Defining a transcendental probability value->When (I)>Basic water level probability value for anti-floating fortification>Defining an override probability valueWhen (I)>The probability value of water level is +.>Based on the following principle:
first, assuming that probability of occurrence of a groundwater level exceeding a certain water level follows poisson distribution, probability Q of occurrence of a groundwater level exceeding a certain water level M times in a field region within M years may be expressed by poisson distribution as shown in equation (15):
（15）
in the formula (15), Q represents a probability value that m times of groundwater level exceeds a certain water level occur in a field region, m represents times that the groundwater level exceeds a certain water level occur in the field region, and n represents a reproduction period (namely, years of existing groundwater level monitoring data represent that the known groundwater level data all occur at least once in n years, and the situation is met in n years);
when m=0, Q represents a probability that no occurrence of the ground water level exceeding a certain water level occurs once in M years, at this time,the area is then a probability +.A.of the groundwater level exceeding a certain water level occurs at least once in the M year>As shown in formula (16):
（16）
in the formula (16), M is the design service life of temporary engineering or permanent engineering; n is a reproduction period which is the same as the years of the existing groundwater level monitoring data.
The expression (16) shows that the overrun probability in the M years isThe reproduction period of (2) is n years. As can be seen from the calculation of the formula (16), when the designed service life m=50 years, the overrun probability of exceeding a certain water level is +.>The ground water level reproduction period of (2) is n= 474.56 years; when the designed service life m=50 years, the overrun probability of exceeding a certain water level is +.>The ground water level reproduction period of (2) is n= 50.29 years; when the designed service life m=50 years, the overrun probability of exceeding a certain water level is +.>The ground water level reproduction period of (2) is n= 1641.54 years.
When the service life M=2 years is designed, the overrun probability of exceeding a certain water level is thatThe ground water level reproduction period of (2) is n=18.98 years; as can be seen from the calculation of the formula (16), when the designed service life m=2 years, the overrun probability of exceeding a certain water level is +.>The ground water level reproduction period of (2) is n=2.01 years; when the designed service life m=2 years, the overrun probability of exceeding a certain water level is +.>The ground water level reproduction period of (2) is n= 65.66 years.
It can be seen from the above that:
the reproduction period and the design service life are basically consistent when the overrun probability is 63%, which means that the groundwater level can basically occur once exceeding a certain water level within the design service life when the overrun probability is 63%;
when the overrun probability is 10%, the reproduction period is 9.49 times of the design service life basically, and when the overrun probability is 10%, the underground water level exceeds a certain water level once within the design service life time period of 9.49 times;
the reproduction period is basically 32.83 times of the design service life when the overrun probability is 3%, which means that when the overrun probability is 3%, the groundwater level exceeds a certain water level once in the design service life time period of 32.83 times;
thus, the present application defines override probability valuesWhen (I)>For anti-floating anti-rare water level probability value ++>Defining a transcendental probability value->When (I)>Basic water level probability value for anti-floating fortification>Defining an override probability valueWhen (I)>The probability value of water level is +.>。
The specific engineering application of the comprehensive determination method of the anti-floating defense water level is as follows:
1. engineering overview
3 residential buildings with 5 layers of reinforced concrete frame structures are built on a certain site, the excavation depth of a foundation pit is about 4m, the ground elevation is 27.43-29.26 m, the service life of the building is 50 years, and the service life of the supporting structure is 2 years.
2. Topography and engineering geological conditions
As shown in fig. 1, the site is a fourth system landform unit belonging to yellow river alluvial plain, the topography is lower, the fourth system stratum in the site mainly comprises cohesive soil, silt and sand which are caused by river alluvial, and the fourth system stratum can be divided into 5 layers and sublayers thereof in the drilling depth range, wherein the layers are respectively from top to bottom: (1) and (3) a mixed filling layer: the soil layer thickness is 0.50-3.00 m, (2) the powder soil layer: the soil layer is 0.30-6.30 m thick, the powder soil layer is 0.50-6.60 m thick, and the sub-layer is (3) 1 Powdery clay, (3) 2 A clay layer, (4) a powdery clay layer having a thickness of 0.50 to 8.60m and a sublayer of (4) 1 Powder soil layer (4) 2 Silt layer (4) 3 A fine sand layer, (5) a silty clay layer, the layer thickness being 0.50-12.00 m, the sublayers of the layer having (5) 1 A powder soil layer.
3. Underground water condition in field
The ground water type in the field is fourth mooring hole diving. The groundwater level is buried shallowly, and the groundwater is mainly supplied by atmospheric precipitation and surface water, and is mainly discharged through atmospheric evaporation, artificial exploitation and lateral runoff. Measuring the static water level burial depth of the underground water in a borehole during field exploration to be 0.4-2.8 m, the stable water level during exploration to be 27.71-28.65 m and the highest stable water level F during exploration k =28.65m。
4. Anti-floating setting water level calculation
A comprehensive determination method for anti-floating defense water level in geotechnical engineering investigation comprises the following steps:
s1, collecting ground water level monitoring data in a field, wherein a ground water level change curve in the field for 20 years is shown in fig. 2;
s2, as can be seen from FIG. 2, the field has the highest water level F within about 20 years max =31.18m, lowest water level F min =23.04 m, mean water level value F mid 26.56m, the water level F in the anti-floating groundwater of the place for approximately 20 years z =F mid 26.56m, water head h=8.14m.
S3, sequencing the ground water level monitoring data in a sequence from small to large, and dividing the ground water level change interval into 2 m=10 equal segments, wherein the interval size range value Q of one equal segment is 0.814m; then, the number of the ground water level monitoring data which respectively fall into 10 equal segments is counted, and the exceeding probability value of the ground water level monitoring data which is larger than or equal to the ground water level lower limit value of each equal segment is calculatedAs shown in table 2;
TABLE 2
S4, designing the service life M of the foundation pit in the field to be 2 years, designing the service life M of the building with the 5-layer frame structure in the field to be 50 years, and calculating the anti-floating anti-rare water level equivalent fortification probability, the anti-floating basic water level equivalent fortification probability and the anti-floating anti-high water level equivalent fortification probability of the foundation pit in the field and the building with the 5-layer frame structure in the field when the probability of exceeding the probability value is 3%, 10% and 63% respectively, wherein the anti-floating anti-rare water level equivalent fortification probability is shown in the table 3:
TABLE 3 Table 3
Then, based on the calculated equivalent fortification probability of the anti-floating fortification water level, the equivalent fortification probability of the anti-floating fortification basic water level and the equivalent fortification probability of the anti-floating fortification water level of the foundation pit in the field and the building with the 5-layer frame structure in the field in the table 3, respectively performing interpolation calculation through the formulas (12) to (14) to obtain water level change values S of the anti-floating fortification water level corresponding to the equivalent fortification probabilities respectively h Water level change value S of anti-floating basic water level b Water level change value S of anti-floating fortification multi-meeting water level d ；
To facilitate the calculation of the difference value, the present application monitors the groundwater level monitoring data F n Greater than or equal toExceeding probability value of lower limit value of each equal-section ground water levelAnd probability value->Corresponding water level change value S n Respectively counting, wherein the lower limit value of each equal-section groundwater level exceeds the probability value +.>A water level change value S n The relationship of (2) is shown in Table 4;
TABLE 4 Table 4
In table 4, the first line of data represents the meaning: when the lower limit data of the ground water level in the equal-section field is 21.56m, the overrun probability value is 100%, and the water level change value is-5 m.
Then, based on the anti-floating anti-rare water level, the anti-floating basic water level and the water level change value of the anti-floating anti-multi-water level, respectively calculating the anti-floating basic water level F of the field by using the formulas (6) to (8) b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h The calculation results are shown in table 5:
TABLE 5
In table 5, three cases of 3%, 10% and 63% of overrun probability values are shown, and when the overrun probability values are 3%, 10% and 63% respectively, the anti-floating anti-rare water level equivalent fortification probability, the anti-floating basic water level equivalent fortification probability and the anti-floating anti-high water level equivalent fortification probability of the foundation pit in the field and the 5-layer frame structure building in the field can be known by referring to table 3, and are not repeated in table 5.
S5, according to JianThe anti-floating technical standard of construction engineering, JGJ476-2019, determines the anti-floating protection level of a temporary engineering, namely a foundation pit in a site, and a permanent engineering, namely a building with a 5-layer frame structure, and as shown in a table 6, the concrete mode of matching the anti-floating protection level according to the anti-floating protection level is as follows: when the anti-floating protection level is the first level, the anti-floating protection water level adopts the anti-floating anti-rare water level F h When the anti-floating fortification level is level B, the anti-floating fortification water level adopts an anti-floating fortification basic water level F b When the anti-floating fortification level is level C, the anti-floating fortification level adopts the anti-floating fortification level F which is more than the water level F when the anti-floating fortification level is level C d The method comprises the steps of carrying out a first treatment on the surface of the As can be seen from table 5, the anti-floating level of the building (structure) corresponds to the determined anti-floating level of the foundation pit and the 5-layer frame structure building in the field, as shown in table 7.
TABLE 6
TABLE 7
S6: the temporary engineering and the permanent engineering are determined to be anti-floating waterproof level F f (wherein F) f For resisting floating and defending the basic water level F b Anti-floating fortification multi-meeting water level F d And anti-floating anti-rare water level F h One of the values) and the highest stable water level F during investigation k Comparing the sizes to obtain the final anti-floating waterproof levelThe method comprises the steps of carrying out a first treatment on the surface of the In this embodiment, as shown in table 8, the anti-floating water level F of the 5-story frame structure building is determined in step S5 f The final anti-floating water level F of the building with the 5-layer frame structure takes the maximum value of the determined anti-floating water level and the highest stable water level during the investigation, namely 30.16m, which is 30.16m, and the highest stable water level during the investigation is 28.65 m; similarly, the final anti-floating waterproof level F of the pit foundation in the field is 28.65m.
In summary, the final anti-floating water level of the 5-layer frame structure building obtained by the method is 30.16m, and compared with the mode of identifying the highest historical water level as the anti-floating water level in the prior art, the final anti-floating water level of the 5-layer frame structure building is reduced by 31.18 m-30.16m=1.02m; compared with the mode of identifying the highest historical water level as the anti-floating water level in the prior art, the anti-floating water level of the foundation pit engineering in the field is 28.65m, and the final anti-floating water level of the foundation pit engineering in the field is reduced by 31.18m-28.65 m=2.53 m; therefore, the method is simple, convenient and reasonable, and the problem of waste of later anti-floating design can be effectively avoided.
TABLE 8
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Claims (4)
1. A comprehensive determination method of anti-floating defense water level is characterized in that: the method comprises the following steps:
s1: acquiring ground water level monitoring data F of a field existing in near n years n ；
S2: monitoring data F from groundwater level n In the process, the highest water level F is obtained max Minimum water level F min Average water level value F mid A water level difference H; let the average water level value F mid Is the water level F in the ground water which resists floating for nearly n years z I.e.；
S3: monitoring the groundwater level data F n Dividing into 2m equal segments; then, the ground water level monitoring data F which respectively fall into 2m equal segments are counted n Number N of (2) n And groundwater level monitoring data F n Probability values K respectively falling within 2m equal segments n The method comprises the steps of carrying out a first treatment on the surface of the Make ground water level monitor data F n The exceeding probability value of the lower limit value of any equal-section ground water level isAnd calculate +.>A value;
in step S3, groundwater level monitoring data F n Probability values K respectively falling within 2m equal segments n The calculation formula of (2) is shown as formula (4):
（4）
in the formula (4), N n Representing groundwater level monitoring data F falling respectively within 2m aliquots n Is the number of (3); n is the existing ground water level monitoring data F of nearly N years n Is the total number of (3);
in step S3, an override probability value is calculatedThe calculation formula of (2) is shown as formula (5):
（5）
in the formula (5), K n Representing groundwater level monitoring data F n Probability values respectively falling into 2m equal segments, m represents half of the number of the equal segments, and x is a natural number of 0 to 2m;
s4: defining an overrun probability value when the design service life of the temporary engineering and the permanent engineering is M3%, 10% and 63% respectively, < + >>The probability values of the anti-floating anti-rare water level are respectively +.>Anti-floating defense basic water level probability value +.>Anti-floating fortification multi-water level probability value +.>Then, according to the probability distribution function of Poisson distribution, the equivalent fortification probability P of anti-fortification water level, anti-fortification basic water level and anti-fortification water level is calculated respectively h 、P b 、P d Then, obtaining a corresponding water level change value S through interpolation calculation h 、S b 、S d Then according to the water level change value S h 、S b 、S d And the water level F in the anti-floating groundwater of nearly n years z Respectively calculating the anti-floating basic water level F of the field b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h ；
The step S4 specifically comprises the following steps: defining an overrun probability value when the design service life of the temporary engineering and the permanent engineering is MThe corresponding water level is the anti-floating basic water level F b Defining a transcendental probability value->The corresponding water level is the anti-floating fortification most meeting water level F d Defining a transcendental probability value->The corresponding water level is the anti-floating anti-rare water level F h The method comprises the steps of carrying out a first treatment on the surface of the When exceeding the probability value->When in use, let->For anti-floating anti-rare water level probability value ++>When exceeding the probability valueWhen in use, let->Basic water level probability value for anti-floating fortification>When exceeding the probability value->Time, orderThe probability value of water level is +.>Then, the equivalent fortification probability P of the anti-fortification water level, the anti-fortification basic water level and the anti-fortification water level is calculated respectively according to the probability distribution function of the Poisson distribution h 、P b 、P d The method comprises the steps of carrying out a first treatment on the surface of the Then, based on the calculated equivalent fortification probability P h 、P b 、P d Then, obtaining the equivalent fortification probability P respectively through interpolation calculation h 、P b 、P d The water level change value S of the anti-floating anti-rare water level, the anti-floating basic water level and the anti-floating anti-multi-water level respectively corresponding to each other h 、S b 、S d Then based on the anti-floating anti-rare water level, the anti-floating basic water level and the water level change value S of the anti-floating anti-multi-water level h 、S b 、S d And the water level F in the anti-floating groundwater of nearly n years z Respectively calculating the anti-floating basic water level F of the field b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h ；
In step S4, the probability distribution function of poisson distribution is as shown in equations (9), (10) and (11):
（9）
（10）
（11）
in the formulas (9) to (11), n represents the existing groundwater level monitoring data F n The years of the project, M, represents the design service life of the temporary project and the permanent project; defining an override probability valueWhen (I)>For anti-floating anti-rare water level probability value ++>In formula (9), a ++>3%; defining a transcendental probability value->When (I)>Basic water level probability value for anti-floating fortification>In formula (10)>10%; definition overrideRate->When (I)>To resist floating fortification and meet the probability value of water levelIn formula (11)>63%;
in the step S4, the anti-floating basic water level F of the field is calculated by using the formula (6), the formula (7) and the formula (8) respectively b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h ；
（6）
（7）
（8）
In the formula (6), F b Represents the anti-floating defense basic water level, F z Represents the water level in the anti-floating groundwater of the field for nearly n years, S b A water level change value representing an anti-floating basic water level;
in the formula (7), F d Represents the anti-floating fortification water level which is more encountered, F z Represents the water level in the anti-floating groundwater of the field for nearly n years, S d A water level change value representing the water level which is more likely to be subjected to anti-floating fortification;
in the formula (8), F h Represents the anti-floating anti-rare water level, F z Represents the water level in the anti-floating groundwater of the field for nearly n years, S h Representing the change of the anti-floating anti-rare water levelA value is converted;
s5: determining the anti-floating protection level of temporary engineering and permanent engineering, and matching the anti-floating protection basic water level F according to the anti-floating protection level b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h ；
The step S5 specifically comprises the following steps: the specific modes of determining the anti-floating protection grades of the temporary engineering and the permanent engineering and matching the anti-floating protection water level according to the anti-floating protection grades are as follows: when the anti-floating protection level is the first level, the anti-floating protection water level adopts the anti-floating anti-rare water level F h When the anti-floating fortification level is level B, the anti-floating fortification water level adopts an anti-floating fortification basic water level F b When the anti-floating fortification level is level C, the anti-floating fortification level adopts the anti-floating fortification level F which is more than the water level F d ；
S6: the temporary engineering and the permanent engineering are determined to be anti-floating waterproof level F f And the highest stable water level F during investigation k Comparing the sizes to obtain the final anti-floating waterproof levelThe method comprises the steps of carrying out a first treatment on the surface of the Wherein, the temporary project and the permanent project determine the anti-floating waterproof level F f For resisting floating and defending the basic water level F b Anti-floating fortification multi-meeting water level F d Anti-floating anti-rare water level F h Is set, is a value of one of the values of (a).
2. The method for comprehensively determining the anti-floating waterproof level according to claim 1, wherein: in step S3, a calculation formula of the interval size Q of the equal segment is shown in formula (1):
（1）
in the formula (1), H is the highest water level F max And the lowest water level F min 2m represents the number of equal segments, m represents half the number of equal segments, and Q represents a section size value of one equal segment.
3. The method for comprehensively determining the anti-floating waterproof level according to claim 1, wherein: in step S3, each of the equally segmented groundwater level monitoring data F n The range value of (2) is shown in the formula,
（2）
in the formula (2), F n For groundwater level monitoring data, F z Is the water level of the anti-floating groundwater in the field for nearly n years, H is the highest water level F max And the lowest water level F min M represents half the number of equal segments, x is a natural number from 0 to 2 m.
4. The method for comprehensively determining the anti-floating waterproof level according to claim 1, wherein: in step S3, the m value is obtained in the manner shown in the formula (3):
（3）
in the formula (3), H represents a water level difference, m is a positive integer greater than or equal to 1,the representation is rounded up.
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