CN112884292A - Method for analyzing influence of sandy cobble stratum shield construction parameter control on surface settlement - Google Patents
Method for analyzing influence of sandy cobble stratum shield construction parameter control on surface settlement Download PDFInfo
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Abstract
The invention belongs to the technical field of buildings, and discloses an analysis method for the influence of shield construction parameter control of a sandy cobble stratum on surface subsidence. The method for analyzing the influence of the shield construction parameter control of the sandy cobble stratum on the surface settlement comprises the following steps: and analyzing the influence factor sensitivity of the ground surface settlement in the shield construction process of the water-rich sandy gravel stratum based on the actually measured data of the control parameters through a grey correlation theory, determining main shield construction parameters influencing the ground surface settlement, and objectively and accurately reflecting the relation between the shield construction parameter control of the water-rich sandy gravel stratum and the ground settlement by using a grey correlation analysis model. The method discloses main shield construction parameters influencing ground surface settlement, and provides important basis and reference for subway engineering shield construction parameter control and ground surface settlement control.
Description
Technical Field
The invention belongs to the technical field of buildings, and particularly relates to an analysis method for influences of shield construction parameter control of a sandy cobble stratum on surface settlement.
Background
At present, the permeability of a sandy gravel stratum is generally high, the structure is relatively loose, the cohesive force is extremely low, the overall stability of the sandy gravel stratum is generally poor, the stress state of the stratum near an excavation face is inevitably changed in the shield tunneling process, stratum loss is caused, large ground subsidence and building damage are caused in serious cases, and great difficulty is caused to shield construction. Therefore, shield construction parameters need to be strictly controlled according to geological conditions and surrounding environments so as to ensure that the ground surface settlement is within a safe range.
Scholars at home and abroad carry out a great deal of research aiming at the problem. In the prior art 1, a cross section ground surface settlement mathematical expression is provided according to a normal distribution probability density function; prior art 2 deduces sandy soil working face stabilityUpper and lower limit solutions of sex; in the prior art 3, the relation between the excavation surface burial depth and the damage form in the homogeneous sandy soil is analyzed through a centrifugal test; in the prior art 4, the equivalent stratum parameters are obtained by using a displacement back analysis method, and the sensitivity of the surface deformation to the equivalent stratum parameters is analyzed; in the prior art 5, an earth pressure balance shield tunneling mathematical model is established, and a mathematical expression among total thrust, earth bin pressure, screw machine rotating speed and tunneling speed is deduced; in the prior art 6, the sensitivity of the ground surface settlement caused by shield construction to various factors is analyzed based on a sensitivity analysis principle; in the prior art 7, the influence of capital subway shield tunnel construction on the surrounding environment is analyzed by adopting FLAC 3D; in the prior art 8, the influence of various factors on surface subsidence in shield construction is analyzed by taking a Beijing subway as an example; prior art 9 by PFC2DPlaxis3D has prior simulation, and provides a suggested value of the pressure of an earth bin of an excavation surface of a sandy gravel stratum and a value range of a tailing grouting pressure parameter; the prior art 10 analyzes the influence of the buried depth of a large-diameter earth pressure balance shield engineering tunnel, a sandy soil layer, synchronous grouting amount, earth bin pressure and the like on the settlement deformation of the earth surface; in the prior art 11, a discrete element mechanical model of a soil body in a shield tunneling process is established, and a destabilization mechanism and a settlement development rule of a shield tunneling surface of a sandy gravel stratum are researched; in the prior art 12, a key parameter mechanical model for earth pressure balance shield construction in a sandy gravel stratum is established; the prior art 13 proposes the tunneling parameters of a large-diameter slurry shield in a water-rich sandy gravel stratum; the prior art 14 analyzes the disturbance mechanism of shield tunneling in a sandy gravel stratum and the reason of later settlement, establishes a two-dimensional discrete element analysis model, and provides a control measure for reducing the hysteresis settlement; in the prior art 15, control parameters and a control method for shield construction of a water-rich sandy gravel stratum are provided through tests and simulation; the prior art 16 analyzes the relationship between slurry shield tunneling control parameters and surface subsidence in the lanzhou sandy gravel stratum. According to the existing research results, the control of the shield construction parameters can effectively control the surface subsidence, the influence degree of each parameter on the subsidence is different, and the research on the sensitivity of the shield construction parameters of the water-rich sandy gravel stratum to the surface subsidence and the parameter control range are lacked at present.
Through the above analysis, the problems and defects of the prior art are as follows: the prior art does not aim at the research of the shield construction parameters of the water-rich sandy gravel stratum on the surface subsidence sensitivity and the parameter control range.
The difficulty in solving the above problems and defects is:
and (3) determining a sand and pebble disturbance mechanism and a formation disturbance form and selecting an optimal analysis method.
The method comprises the steps of accurately obtaining surface subsidence data, determining surface subsidence influence factors, and establishing a surface influence factor subsequence and a surface influence factor mother sequence.
And the range change method is used for processing data and acquiring a difference sequence matrix.
And determining a calculation method of each factor in the correlation series matrix.
And determining the relevance vector of the surface subsidence influence factors, determining the sensitivity of each influence factor to the surface subsidence and deriving a corresponding formula.
Determining main influence factors, secondary influence factors and dominant factors, and determining the relation between shield construction parameter control of the water-rich sandy gravel stratum and ground settlement.
The significance of solving the problems and the defects is as follows:
and determining the sensitivity of the ground settlement to the shield tunneling control parameters when passing through the building group and the surface water.
The obtained correlation can objectively and accurately reflect the relation between the ground settlement and each shield construction control parameter in the construction period of the region where the subway shield region is located, so that theoretical reference is provided for shield construction parameter control and ground settlement control.
The method provides a referable control range for the actual production process by determining the shield parameters, and provides experience and reference for controlling ground settlement in the subway shield construction process.
An implementation method is provided for execution of a computer program comprising a memory and a processor.
There is provided an analysis method when a readable storage medium storing a computer program is executed by a processor.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an analysis method for the influence of shield construction parameter control of a sandy cobble stratum on surface subsidence.
The invention is realized in this way, a method for analyzing the influence of shield construction parameter control of sandy cobble stratum on surface subsidence comprises the following steps: and analyzing a formation disturbance mechanism, determining a formation disturbance form and establishing an optimal analysis method.
Specifically, the influence factor sensitivity analysis is carried out on the ground surface settlement in the shield construction process of the water-rich sandy gravel stratum through the grey correlation theory based on the analysis of the measured data of the control parameters, main shield construction parameters influencing the ground surface settlement are determined, and the relation between the shield construction parameter control of the water-rich sandy gravel stratum and the ground settlement is determined.
Further, the main shield construction parameters influencing the ground surface settlement are total thrust, cutter torque, synchronous grouting pressure, screw machine torque, cutter rotation speed, soil bin pressure, grouting amount, propulsion speed and screw machine rotation speed in sequence from large to small according to sensitivity.
Further, the method for analyzing the influence of the shield construction parameter control of the sandy gravel stratum on the surface settlement comprises the following steps:
acquiring surface subsidence monitoring data, and determining influence factors influencing surface subsidence; establishing a sub-sequence and a mother sequence of the earth surface influence factors based on the determined influence factors influencing the earth surface settlement;
step two, normalizing the subsequence and the subsequence by adopting a range variation method, and transforming the processed subsequence and the subsequence to obtain a difference sequence matrix;
calculating each factor in the correlation coefficient matrix based on the maximum value and the minimum value in the obtained difference sequence matrix;
step four, calculating and determining the relevance vector G of the earth surface settlement influence factors through the relevanceiAnd the sensitivity g of each influencing factor to the surface subsidencem；
Step five, baseRelevance vector G for determined surface subsidence influence factorsiAnd the sensitivity g of each influencing factor to the surface subsidencemConstructing a correlation matrix;
and step six, determining a main influence factor and a secondary influence factor based on the correlation degree of the matrix, determining an advantage factor, and further determining the relation between the shield construction parameter control of the water-rich sandy gravel stratum and the ground settlement.
Further, the establishing the sub-sequences and the mother sequences of the surface influence factors based on the determined influence factors influencing the surface subsidence comprises:
forming a reference sequence matrix X by the influencing factors, wherein the reference sequence matrix X is an influencing factor subsequence; and forming a matrix Y by the land surface settlement data corresponding to each influence factor, wherein the matrix Y is a mother sequence.
Further, the surface influencing factor subsequence X is as follows:
wherein m represents the number of the surface subsidence monitoring data, and n represents the number of the influencing factors.
Further, the parent sequences are as follows:
further, in step three, the normalization processing formula is as follows:
further, in step three, the transformation formula of the mother sequence and the subsequence is as follows:
Δmn＝|Xmn-Ymn|。
further, the calculation formula of each factor in the correlation coefficient matrix is as follows:
wherein, amnRepresenting the factors in the correlation coefficient matrix A; deltamaxAnd ΔminRespectively representing the maximum value and the minimum value in the difference sequence matrix; δ represents a resolution coefficient.
Further, in step five, the sensitivity degree g of the surface subsidencemThe calculation formula is as follows:
further, in step six, the relevance vector G based on the determined ground subsidence influence factorsiAnd the sensitivity g of each influencing factor to the surface subsidencemConstructing the relevancy matrix comprises the following steps:
the matrix of the incidence degree is as follows: r ═ gmn)i×j；
Wherein i represents the number of reference sequences; j represents the number of comparison sequences; gmnRepresenting the comparison sequence xnFor reference sequence ymThe degree of association of (c).
Further, in the sixth step, the determining a primary influence factor and a secondary influence factor based on the magnitude of each degree of association of the matrix, and determining an advantage factor includes:
determining a primary influence factor and a secondary influence factor according to the magnitude of each correlation degree in the matrix R; the main influencing factors are dominant factors, namely: s, l is equal to {1, 2, …, j }, and g is satisfiedms＞gmlI.e. influencing factor xsIs superior to xl。
The invention also aims to provide an analysis system for the influence of the sandy cobble stratum shield construction parameter control on the surface subsidence, and the analysis system for the influence of the sandy cobble stratum shield construction parameter control on the surface subsidence implements the analysis method.
It is a further object of the invention to provide a computer arrangement comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the analysis method.
It is a further object of the present invention to provide a computer readable storage medium, storing a computer program which, when executed by a processor, causes the processor to perform the analysis method.
By combining all the technical schemes, the positive effects of the invention comprise:
according to the method, through the grey correlation theory, the influence factor sensitivity analysis is carried out on the ground surface settlement in the shield construction process of the water-rich sandy gravel stratum based on the analysis of the actually measured data of the control parameters, the main shield construction parameters influencing the ground surface settlement are determined, and the relation between the shield construction parameter control of the water-rich sandy gravel stratum and the ground settlement is determined.
The main shield construction parameters influencing the surface subsidence are total thrust, cutter torque, synchronous grouting pressure, screw machine torque, cutter rotating speed, soil bin pressure, grouting amount, propelling speed and screw machine rotating speed in sequence from large to small according to sensitivity.
The obtained correlation can objectively and accurately reflect the relation between the ground settlement and each shield construction control parameter in the construction period of the region where the subway shield zone is located, so that theoretical reference is provided for shield construction parameter control and ground settlement control in the region.
Taking the section of 17 th line of Chengdu subway from the Feng road station to the Feng xi station as an example, the control range of the shield tunneling parameter value is as follows.
The invention has the advantages and positive effects that: according to the method, influence factor sensitivity analysis is carried out on the ground surface settlement in the shield construction process of the water-rich sandy gravel stratum through a grey correlation theory, main shield construction parameters influencing the ground surface settlement are disclosed, and important basis and reference are provided for the shield construction parameter control and the ground surface settlement control of the subway engineering.
Technical effect or experimental effect of comparison. The method comprises the following steps:
when passing through a building group, the sensitivity of ground settlement to shield tunneling control parameters is sequentially a propelling speed, a grouting pressure, a screw machine rotating speed, a soil bin pressure, a cutter head rotating speed, a total thrust, a grouting amount, a cutter head torque and a screw machine torque from large to small; when the water body passes through the earth surface, the sensitivity of the water body is the propelling speed, the grouting amount, the rotating speed of the screw machine, the torque of the cutter head, the synchronous grouting pressure, the total thrust, the torque of the screw machine, the soil bin pressure and the rotating speed of the cutter head from large to small.
Taking the section of Chengdu subway No. 17 coming from the Feng road station-Feng xi station as an example, the control range of the shield tunneling parameter value is compared with the control range of the shield construction parameter of the sandy gravel stratum in Beijing as follows.
[1] Su bin, Su Yi, Jiangyun. Beijing typical stratum shield adaptability comparison and construction key technology [ M ]. Beijing: people traffic press, 2013.4.
The contrast can be concluded that the sandy gravel stratum in Beijing and Chengdu areas have larger difference, the shield construction control parameters have larger difference, and the shield construction control parameters cannot be directly handled, otherwise, serious potential safety hazard exists.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a flow chart of an analysis method for the influence of shield construction parameter control on surface subsidence of a sandy gravel stratum provided by an embodiment of the invention.
Fig. 2 is a mechanism diagram of the loss of the stratum of the excavation face provided by the embodiment of the invention.
In fig. 2: 1. a cutter head is cut; 2. and (4) shielding.
FIG. 3 is a diagram of a shield shell peripheral formation loss mechanism provided by an embodiment of the present invention.
In fig. 3: 3. a duct piece; 4. a shield steel shell; 5. a shield tail water stop; 6. a shield tail gap; 7. shield tail operating space
Fig. 4 is a structural diagram of a shield machine cutter head according to an embodiment of the present invention.
In fig. 4: 8. a main cutting blade; 9. a first welding-type cutting blade; 10. liquid knife; 11. a second welding-type cutting blade; 13. an edge scraper; 14. a water injection port; 15. a wear plate; 16. an additive injection port protection knife; 17. a hydraulic wear detection knife; 18. overriding the fluid knife.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides an analysis method for the influence of shield construction parameter control of a sandy cobble stratum on surface settlement, and the invention is described in detail below by combining with the attached drawings.
The method for analyzing the influence of the shield construction parameter control of the sandy gravel stratum on the surface settlement provided by the embodiment of the invention comprises the following steps:
and analyzing the influence factor sensitivity of the ground surface settlement in the shield construction process of the water-rich sandy gravel stratum based on the actually measured data of the control parameters through a grey correlation theory, determining main shield construction parameters influencing the ground surface settlement, and determining the relation between the shield construction parameter control of the water-rich sandy gravel stratum and the ground settlement.
The main shield construction parameters influencing the ground surface settlement provided by the embodiment of the invention are total thrust, cutter torque, synchronous grouting pressure, screw machine torque, cutter rotation speed, soil bin pressure, grouting amount, propulsion speed and screw machine rotation speed in sequence from high to low according to sensitivity.
As shown in fig. 1, the method for analyzing the influence of the shield construction parameter control of the sandy gravel stratum on the surface subsidence provided by the embodiment of the invention comprises the following steps:
s101, acquiring surface subsidence monitoring data, and determining influence factors influencing surface subsidence; establishing a sub-sequence and a mother sequence of the earth surface influence factors based on the determined influence factors influencing the earth surface settlement;
s102, normalizing the subsequence and the subsequence by adopting a range variation method, and transforming the processed subsequence and the subsequence to obtain a difference sequence matrix;
s103, calculating each factor in the correlation coefficient matrix based on the maximum value and the minimum value in the obtained difference sequence matrix;
s104, calculating and determining a relevance vector G of the ground subsidence influence factors through relevanceiAnd the sensitivity g of each influencing factor to the surface subsidencem；
S105, determining the relevance vector G of the ground subsidence influence factorsiAnd the sensitivity g of each influencing factor to the surface subsidencemConstructing a correlation matrix;
s106, determining main influence factors and secondary influence factors based on the correlation degrees of the matrix, determining dominant factors, and further determining the relation between shield construction parameter control of the water-rich sandy gravel stratum and ground settlement.
The method for establishing the sub-sequences and the mother sequences of the earth surface influence factors based on the determined influence factors influencing the earth surface settlement comprises the following steps:
forming a reference sequence matrix X by the influencing factors, wherein the reference sequence matrix X is an influencing factor subsequence; and forming a matrix Y by the land surface settlement data corresponding to each influence factor, wherein the matrix Y is a mother sequence.
The sub-sequence X of the surface influencing factor provided by the embodiment of the invention is as follows:
wherein m represents the number of the surface subsidence monitoring data, and n represents the number of the influencing factors.
The parent sequence provided by the embodiment of the invention is as follows:
the normalization processing formula provided by the embodiment of the invention is as follows:
the transformation formula of the parent sequence and the subsequence provided by the embodiment of the invention is as follows:
Δmn＝|Xmn-Ymn|。
the calculation formula of each factor in the correlation coefficient matrix provided by the embodiment of the invention is as follows:
wherein, amnRepresenting the factors in the correlation coefficient matrix A; deltamaxAnd ΔminRespectively representing the maximum value and the minimum value in the difference sequence matrix; δ represents a resolution coefficient.
The sensitivity degree g of the ground surface settlement provided by the embodiment of the inventionmThe calculation formula is as follows:
the embodiment of the invention provides an association degree vector G based on determined earth surface sedimentation influence factorsiAnd the sensitivity g of each influencing factor to the surface subsidencemConstructing the relevancy matrix comprises the following steps:
the matrix of the incidence degree is as follows: r ═ gmn)i×j；
Wherein i represents the number of reference sequences; j represents the number of comparison sequences; gmnRepresenting the comparison sequence xnFor reference sequence ymThe degree of association of (c).
The matrix-based method for determining the main influence factors and the secondary influence factors based on the magnitude of each correlation degree provided by the embodiment of the invention and determining the dominant factors comprises the following steps:
determining a primary influence factor and a secondary influence factor according to the magnitude of each correlation degree in the matrix R; the main influencing factors are dominant factors, namely: s, l is equal to {1, 2, …, j }, and g is satisfiedms＞gmlI.e. influencing factor xsIs superior to xl。
The technical effects of the present invention will be further described with reference to specific embodiments.
Example 1:
1 sand and pebble stratum disturbance mechanism and influence factor
1.1 mechanism of disturbance of sandy gravel formation
When shield construction is carried out on a sandy cobble stratum, due to the pushing and extrusion of a shield machine and the shearing friction action of a shield shell and a soil body, the equilibrium state of the stratum is disturbed and damaged, soil body particles move, the initial stress of the stratum changes and is redistributed, so that the stratum loss is caused, and the stratum loss V is reducedsAs shown in equation 1.
In the formula: vsAmount of formation loss, m2；Vs(%) -formation loss rate expressed as the percentage of formation loss volume to shield theoretical drainage volume; r is0Shield outer diameter, m.
The sandy cobble stratum loss caused by shield tunneling is generally the sum of the stratum losses of an excavation face, the periphery of a shield tunneling machine and a shield tail. The stratum loss at the excavation face is caused by that in the shield excavation process, soil is extruded by the thrust of a shield top to move towards the side, so that the soil in a certain range in front of the excavation face is loosened, as shown in fig. 2. In fig. 2: 1. a cutter head is cut; 2. and (4) shielding.
The sandy gravel stratum has high pebble content and high strength, so that a cutter head and a prop of the shield machine are often seriously abraded, and the stratum loss can be caused when the shield machine is stopped when the shield machine meets a large obstacle in the cutter changing operation or in front.
When the shield shell machine is used for tunneling, friction shearing action and extrusion action with the surrounding sand and pebbles are generated to different degrees, a shearing disturbance area with a certain thickness is formed at the periphery of the shield shell, soil in the shearing disturbance area moves, and stratum loss is caused, as shown in fig. 3. The method comprises the following steps: 3. a duct piece; 4. a shield steel shell; 5. a shield tail water stop; 6. a shield tail gap; 7. shield tail operating space.
In addition, the shield overexcavation caused by attitude adjustment during the tunneling process of the shield tunneling machine, the clearance between the outer diameter of the cutter head and the periphery of the shield shell and the like also cause the loss of the sandy gravel stratum.
Shield tail department because segment lining ring and tunnel excavation wall have certain space, and the soil body that takes place the disturbance by the friction shearing action can remove to this space, causes the deep soil body disturbance, causes the stratum loss. As the sandy gravel stratum has large pores and large permeability coefficient, slurry is easy to generate cross flow during grouting, effective filling of soil body pores cannot be ensured, and the later stability of a sandy gravel stratum tunnel is influenced.
1.2 factors affecting the surface subsidence
The surface subsidence of the sandy gravel stratum is mainly caused by the stratum loss caused by shield construction. According to the settlement mechanism, the stress state of the excavation surface, the gap between the soil body and the shield shell, the overexcavation caused by deviation correction, the shield tail grouting pressure and other influence factors are all related to the shield construction parameter control, and mainly comprise the earth bin pressure, the tunneling speed, the shield total thrust, the cutter torque and the rotating speed, the synchronous grouting pressure and the grouting amount, the shield attitude offset and the like. Due to poor flow plasticity of the sand and pebbles, the working pressure in the soil bin is not necessarily consistent with the actual working pressure, so that the stability of an excavated surface is influenced, and collapse is induced in severe cases to cause surface subsidence. When the slag is discharged, large pebbles are easy to be retained in the earth bin or move around, the position and the posture of the shield tunneling machine are influenced, and once the blockage occurs, the shield tunneling machine cannot be pushed forward, and the stability of an excavation surface is also influenced. In addition, the burial depth of the shield tunnel is also a key factor influencing the ground surface settlement, and the burial depth determines whether a pressure arch can be formed at the top of the tunnel, so that the movement of soil particles is controlled and the disturbance is reduced.
2 Grey correlation analysis model
2.1 principle of Gray correlation analysis
The grey correlation analysis method is one of basic methods of grey system theory, and is a method for analyzing and determining the influence degree among system factors or the contribution measure of the factors to the main behavior of the system through grey correlation. The basic idea is to analyze the association degree among multiple factors in the system according to the comparison of the similarity degree of the geometric shapes of the curves of the statistical sequence of the system, wherein the closer the geometric shapes of the curves are, the greater the association degree is.
2.2 construction of Gray correlation analysis model
The establishment of the gray correlation analysis model requires the determination of the sequence matrix of the evaluation object and the evaluation index. The evaluation index sequence matrix is composed of reference sequence matrixes corresponding to the n influencing factors, and the evaluation object sequence matrix is composed of compared sequence matrixes under a certain condition corresponding to the evaluation index sequence matrix. And the correlation degree between the evaluation object and each evaluation index can be obtained through mapping calculation, and the sensitivity degree of each influence factor to the evaluation object is finally determined.
Taking shield interval construction monitoring as an example, assuming that there are m pieces of ground surface settlement monitoring data and n pieces of influence factors, a reference sequence matrix X composed of the influence factors is an influence factor subsequence, and the matrix X is as follows.
The matrix Y formed by the land subsidence data corresponding to each influence factor is the mother sequence, and the matrix Y is as follows.
And (3) carrying out normalization processing on the data by adopting a range change method, as shown in a formula 2. And transforming the processed parent sequence and the subsequence to obtain a difference sequence matrix delta shown in a formula 3.
Δmn＝|Xmn-Ymn| (3)
Taking the maximum value Delta in the difference sequence matrixmaxAnd a minimum value ΔminAnd calculating each factor a in the correlation coefficient matrix A as shown in equation 4mn。
In the formula: delta-resolution factor, typically 0.5.
The correlation degree g is used for measuring the similarity of the sequences, and the correlation degree of each subsequence to the parent sequence can be calculated by a correlation coefficient matrix, as shown in formula 5. The closer the degree of association is to 1, the more sensitive the effect between sequences is. Relevance vector G capable of determining earth surface sedimentation influence factors through relevance calculationiAnd the sensitivity g of each influencing factor to the surface subsidencem。
2.3 dominance analysis of influencing factors
In actual engineering, shield construction parameters influencing surface subsidence are more, and the factors need to be compared through advantage analysis. Suppose there are i reference sequences y1，y2，…，yiThere are j comparison sequences x1，x2，…，xjAnd g ismnFor comparison of sequences xnFor reference sequence ymIn the correlation degree of (c), R ═ gmn)i×jI.e. the matrix of relevance. It can be determined which of the influencing factors play a primary role and which play a secondary role according to the magnitude of each degree of association in the matrix R. The main influencing factors are dominant factors, namely: s, l is equal to {1, 2, …, j }, and g is satisfiedms＞gmlI.e. influencing factor xsIs superior to xl。
3 engineering case analysis
3.1 general overview of the engineering
The tunnel between the 17 th line coming phoenix road station and the fengxi station of Chengdu subway has the total length of 1603.2m, the stratum is large-particle-diameter, high-strength and water-rich sandy gravel, the maximum content of cobble exceeds 75%, the particle diameter of boulder is 20-60 cm, the uniaxial compressive strength of cobble exceeds 132MPa, the compaction degree of a cobble layer is extremely poor, the grading and content non-uniformity coefficient of cobble soil is large, and in addition, a local doped lenticular sand layer has extremely strong water permeability and extremely poor self-stability. A large amount of pore water exists in the interval range, the diving water amount and the water level are stable, the buried depth of the underground water static water level is about 3.8-7.3 m, the surface water is mainly the feng river, the river is distributed approximately in parallel to the line in the shield interval from the national beauty to the coming phoenix road, the distance between the river and the coming phoenix road is about 2-7 m, and the physical and mechanical indexes of the stratum are shown in a table 1.
The buried depth of a top plate of the shield tunnel structure is 9.57-20.14 m, the buried depth of a bottom plate is 17.57-28.1 m, the gradient of a longitudinal slope of the interval tunnel is 10.063 per thousand, and the radius of a minimum plane curve is 450 m. The tunnel adopts a circular precast reinforced concrete segment structure, the inner diameter is 7.5m, the outer diameter is 8.3m, the design strength is C50, and the impermeability grade is P12. The method of combining synchronous grouting and secondary supplementary grouting is adopted for grouting behind the shield segment lining. The shield tunneling machine cutterhead is shown in figure 4. The method comprises the following steps: 8. a main cutting blade; 9. a first welding-type cutting blade; 10. liquid knife; 11. a second welding-type cutting blade; 13. an edge scraper; 14. a water injection port; 15. a wear plate; 16. an additive injection port protection knife; 17. a hydraulic wear detection knife; 18. overriding the fluid knife.
TABLE 1 main parameters of each soil layer in shield tunnel section
The buildings on two sides of the shield tunnel interval line are numerous, and a phoenix river is arranged on the west side. The tunnel section is provided with a line side below which the phoenix brook passes, a short distance side passes through the building group, the minimum vertical clear distance between the top of the shield tunnel and the bottom of the house foundation is 7.92m, and the vertical clear distance between the shield tunnel and the phoenix brook is 6.9 m.
3.2 analysis of sensitivity to factors affecting surface subsidence
As the surrounding environment of the shield tunnel region of the project is very complex and the geological condition is poor, the stratum loss is caused inevitably in the shield tunneling process, and the ground settlement is caused. Therefore, the control of the shield tunneling parameters is extremely important. In the scheme, 9 shield tunneling parameters of total thrust, cutter torque, cutter rotation speed, propulsion speed, screw machine rotation speed, screw machine torque, grouting amount, synchronous grouting pressure and soil bin pressure are selected as influence factors of ground settlement, ground settlement monitoring data and control parameter data of 1 kilometer before shield construction for 4 months are selected, and data are selected at intervals of every 5 days for analysis and calculation, as shown in table 2.
And analyzing the influence degree of the shield tunneling parameters on the ground settlement by adopting a gray correlation model. The matrix X is normalized as shown in equations (2) to (4)mnThe difference sequence matrix deltaijThe matrix of correlation coefficients AmnAnd the degree of association vector GiRespectively as follows.
TABLE 2 Shield tunneling parameters and ground settlement monitoring data in shield tunnel section
Gi＝[x1,x2,x3,x4,x5,x6,x7,x8,x9]T＝[0.7413,0.6802,0.6627,0.5962,0.5735,0.6651,0.6140,0.6699,0.6606]T
TABLE 3 Shield tunneling parameter value control Range
According to the calculation result of the grey correlation degree, the grey correlation sequence of the shield tunneling control parameter to the ground surface settlement sensitivity is as follows: x is the number of1＞x2＞x8＞x6＞x3＞x9＞x7＞x4＞x5Namely, the sensitivity of each parameter to the surface subsidence is as follows from big to small: total thrust (0.7413), cutterhead torque (0.6802), synchronous grouting pressure (0.6699), screw machine torque (0.6651), cutterhead rotating speed (0.6627), soil bin pressure (0.6606), grouting amount (0.6140), propulsion speed (0.5962) and screw machine rotating speed (0.5735).
According to the grey correlation degree, when the shield tunnel construction is carried out in the water-rich large-particle-size sandy gravel stratum in the Chengdu area, the main factor influencing the ground settlement is the total thrust of the shield machine. The thrust of the shield machine is a power device for forward tunneling of the shield, and is one of key components for reflecting the performance of shield equipment. In the shield tunneling process, the total thrust value is closely concerned, and the propelling pressure of each group of oil cylinders is timely adjusted to realize propelling, deviation rectifying and direction regulating. If the thrust is too small, but the thrust speed is high, the stratum cavity is likely to be encountered; if the pushing force is too large, but the pushing speed is slow, the pushing speed is probably caused by mud cakes formed by the cutter disc; when the thrust is great enough but there is no thrust speed, a hard formation may be encountered. These conditions have a great influence on the ground settlement, and in severe cases, engineering accidents are caused. Therefore, the jacking force of jacks around the support ring of the shield tunneling machine is adjusted according to different stratum conditions in construction, and the adjustment of the total thrust is one of important factors for reducing ground settlement and ensuring the shield construction safety.
The cutter head torque is one of key parameters for the safe and smooth tunneling of the earth pressure balance shield machine and is another main factor influencing ground settlement. The stratum of the settlement area is rich in pebbles with large grain diameter, a cutter cuts soil in the construction process to generate resistance, and meanwhile, the cutter is easy to wear because the difficulty of cutting the pebbles is greater than that of other strata, so that the torque of the cutter head must be well controlled, otherwise the shield tunneling efficiency is influenced, and engineering accidents are caused in serious cases to cause ground settlement.
Synchronous grouting is that after the shield is propelled, gaps between soil bodies and pipe pieces around the shield can be filled in time, so that important parameters of ground settlement caused by excessive loss of the stratum are avoided, and especially in a water-rich sandy gravel stratum, synchronous grouting control is more important. The grouting pressure is the most important index in synchronous grouting and needs to be determined according to the water and soil pressure resistance of the shield tail seal, the soil bin pressure, the water and soil pressure at the position of a grouting port, the pressure bearing capacity of a segment, the ground surrounding environment and other factors. In the sections with dense buildings and strict ground deformation requirements, the synchronous grouting pressure should be properly increased.
Sensitivity of ground settlement to other control indexes is smaller relative to total thrust, cutter torque and synchronous grouting pressure, wherein some parameters are obtained through calculation after the total thrust, the cutter torque and the synchronous grouting pressure are determined. The shield tunneling parameter control range of the region where the project is located can be summarized according to the construction monitoring data, and is compared with the shield tunneling parameter control range of the sandy gravel stratum in Beijing, as shown in Table 3. Therefore, the sandy gravel stratum in Beijing city and Chengdu area has great difference, and the shield construction control parameters have great difference.
4 the effects of the present invention will be further described below with reference to the results.
(1) The control of the stratum loss is the most effective means for reducing the ground settlement of the sandy gravel stratum, and the setting of reasonable shield tunneling parameters is the main way for controlling the stratum loss. Through grey correlation analysis of the Chengdu subway shield tunnel engineering case, the sensitivity of ground settlement to shield tunneling control parameters is sequentially total thrust, cutter torque, synchronous grouting pressure, screw machine torque, cutter rotating speed, soil bin pressure, grouting amount, propelling speed and screw machine rotating speed from large to small.
(2) The grey correlation analysis is statistical analysis based on actual monitoring data and control data in the shield construction process, and the obtained correlation degree can objectively and accurately reflect the relation between the ground settlement and each shield construction control parameter in the construction period of the region where the subway shield zone is located, so that theoretical reference is provided for shield construction parameter control and ground settlement control in the region.
(3) Case analysis shows that when shield tunnel construction is carried out on the Chengdu water-rich sandy gravel stratum, the main shield construction control parameter range influencing ground settlement is as follows: the total thrust is 20000-35000 kN, the torque of the cutter head is 9000-13000 kN & lt, the synchronous grouting pressure is 2-4 bar, the torque straight-line section of the screw machine is 25-50 kN & lt & gt, the curve section is 20-40 kN & lt & gt, the rotating speed of the cutter head is controlled to be 1.5-1.8 rmp in the straight-line section, and the curve section is controlled to be 1.4-1.6 rmp. The parameter control ranges can provide experience and reference for controlling ground settlement in the subway shield construction process of the Chengdu region.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for analyzing the influence of the shield construction parameter control of the sandy cobble stratum on the surface subsidence is characterized by comprising the following steps of:
acquiring surface subsidence monitoring data, and determining influence factors influencing surface subsidence; establishing a sub-sequence and a mother sequence of the earth surface influence factors based on the determined influence factors influencing the earth surface settlement;
normalizing the subsequence and the subsequence by adopting a range variation method, and transforming the processed subsequence and the subsequence to obtain a difference sequence matrix;
calculating each factor in the correlation coefficient matrix based on the maximum value and the minimum value in the obtained difference sequence matrix;
determining relevance vector G of ground subsidence influence factors through relevance calculationiAnd the sensitivity g of each influencing factor to the surface subsidencem；
Relevance vector G based on determined surface subsidence influence factorsiAnd the sensitivity g of each influencing factor to the surface subsidencemConstructing a correlation matrix;
and determining main influence factors and secondary influence factors based on the correlation degrees of the matrix, and determining dominant factors so as to determine the relation between the shield construction parameter control of the water-rich sandy gravel stratum and the ground settlement.
2. The method for analyzing the influence of the sand and gravel stratum shield construction parameter control on the ground subsidence as claimed in claim 3, wherein the establishing of the sub-sequence and the mother sequence of the ground influence factors based on the determined influence factors influencing the ground subsidence comprises:
forming a reference sequence matrix X by the influencing factors, wherein the reference sequence matrix X is an influencing factor subsequence; forming a matrix Y by the land surface settlement data corresponding to each influence factor, wherein the matrix Y is a mother sequence;
the surface influencing factor subsequence X is as follows:
wherein m represents the number of the surface subsidence monitoring data, and n represents the number of the influencing factors.
3. The method for analyzing the influence of the shield construction parameter control on the surface subsidence of the sandy gravel stratum as claimed in claim 2, wherein the parent sequence is as follows:
4. the method for analyzing the influence of shield construction parameter control on surface subsidence in sandy gravel stratum according to claim 1, wherein the normalization processing formula is as follows:
5. the method for analyzing the influence of the shield construction parameter control of the sandy gravel stratum on the surface subsidence in the sand and gravel stratum as claimed in claim 1, wherein in the third step, the transformation formula of the mother sequence and the subsequence is as follows:
Δmn＝|Xmn-Ymn|；
the calculation formula of each factor in the correlation coefficient matrix is as follows:
wherein, amnRepresenting the factors in the correlation coefficient matrix A; deltamaxAnd ΔminRespectively representing the maximum value and the minimum value in the difference sequence matrix; δ represents a resolution coefficient.
6. The sandy gravel stratum shield construction parameter control of claim 1 for surface subsidenceMethod for analyzing influence, characterized in that the sensitivity g of the surface subsidence is determinedmThe calculation formula is as follows:
7. the method for analyzing the influence of shield construction parameter control on surface subsidence of sandy gravel stratum as claimed in claim 1, wherein said relevancy vector G based on determined surface subsidence influence factorsiAnd the sensitivity g of each influencing factor to the surface subsidencemConstructing the relevancy matrix comprises the following steps:
the matrix of the incidence degree is as follows: r ═ gmn)i×j；
Wherein i represents the number of reference sequences; j represents the number of comparison sequences; gmnRepresenting the comparison sequence xnFor reference sequence ymThe degree of association of (c);
determining a primary influence factor and a secondary influence factor based on the magnitude of each correlation degree of the matrix, and determining a dominant factor comprises:
determining a primary influence factor and a secondary influence factor according to the magnitude of each correlation degree in the matrix R; the main influencing factors are dominant factors, namely: s, l is equal to {1, 2, …, j }, and g is satisfiedms＞gmlI.e. influencing factor xsIs superior to xl。
8. An analysis system for the influence of the sand and gravel stratum shield construction parameter control on the surface subsidence as claimed in claim 1, wherein the analysis system for the influence of the sand and gravel stratum shield construction parameter control on the surface subsidence implements the analysis method as claimed in any one of claims 1 to 7.
9. A computer device comprising a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform an analysis method according to any one of claims 1 to 7.
10. A computer-readable storage medium, storing a computer program which, when executed by a processor, causes the processor to carry out an analysis method according to any one of claims 1 to 7.
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