CN110055986B - Classification classification and multi-objective optimization method for determining foundation pit confined water control scheme - Google Patents
Classification classification and multi-objective optimization method for determining foundation pit confined water control scheme Download PDFInfo
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- CN110055986B CN110055986B CN201910193722.6A CN201910193722A CN110055986B CN 110055986 B CN110055986 B CN 110055986B CN 201910193722 A CN201910193722 A CN 201910193722A CN 110055986 B CN110055986 B CN 110055986B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention discloses a classification and multi-objective optimization method for determining a foundation pit confined water control scheme, which is characterized by comprising the following steps of: s1, collecting data, investigating and establishing a site hydrogeological concept model; s2, classifying the influence degree of confined water on the foundation pit; s3, grading the control level of the confined water of the foundation pit; s4, selecting a pressure-bearing water treatment scheme according to classification; s5, drawing up various alternative control schemes by combining different construction methods; s6, determining the optimal scheme based on multi-objective optimization, and having the advantages that the influence of confined water change on the surrounding environment can be accurately evaluated according to the types of confined water in different foundation pits, so that other limiting factors such as engineering investment, engineering safety, environment, ecology and the like are balanced, the evaluation of the confined water control scheme is realized, and a scientific basis is provided for the final determination of the confined water control scheme.
Description
Technical Field
The invention relates to a multi-objective optimization method, in particular to a classification and multi-objective optimization method for determining a foundation pit confined water control scheme.
Background
Urban rail transit is an important means for solving the problems of traffic jam, land resource shortage and the like in large and medium-sized cities, with the large-scale development of urban construction, a large number of deep foundation pit projects in urban rail transit engineering emerge, the scale and the depth of the deep foundation pit projects are continuously increased, the safety risk of the foundation pit is higher and higher, the environment around the foundation pit is more and more complex, and the environmental control requirement is increased. In a developed area of an underground water system, particularly under the geological condition containing a pressure-bearing water layer, the foundation pit is continuously excavated, so that the thickness of a water-resisting layer between the pit bottom and the pressure-bearing layer is smaller and smaller, and when the thickness of the water-resisting layer is smaller than the critical thickness of anti-inrush, an inrush accident can occur, so that the confined water of the foundation pit is controlled, and the influence of the surrounding environment of construction is reduced, thereby having great significance on engineering construction. The engineering control means of the confined water of the foundation pit mainly comprises precipitation and complete separation, the effect of the complete separation means is obvious, but the construction difficulty is high, and the engineering cost is high; and the adoption of precipitation means has a large influence on the surrounding environment, and an accurate prediction method is lacked, so that certain potential safety hazards are caused. At present, although different scholars have conducted a lot of research on confined water control, their research results are mostly directed to a specific project or a specific construction method, and the analysis of the limiting conditions is not quantitative. Therefore, in order to form a foundation pit confined water classification control technology and give consideration to the safety, economy and feasibility of engineering, a multi-objective optimization method for determining a foundation pit confined water control scheme is urgently needed to be developed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a classification and multi-objective optimization method for determining a foundation pit confined water control scheme, which is quantitative, fine and engineering-oriented, and can accurately evaluate the influence of confined water change on the surrounding environment according to the types of confined water in different foundation pits, thereby balancing other limiting factors such as engineering investment, engineering safety, environment, ecology and the like, realizing the evaluation of the confined water control scheme and providing a scientific basis for the final determination of the confined water control scheme.
The technical scheme adopted by the invention for solving the technical problems is as follows: a classification and multi-objective optimization method for determining a foundation pit confined water control scheme comprises the following steps:
s1, collecting data, investigating and establishing a site hydrogeological parameter model;
s2, classifying the influence degree of confined water on the foundation pit, specifically comprising: combining the established hydrogeological parameter model, selecting a confined water layer (namely a layer to be precipitated or a layer to be isolated) which has the largest influence on the foundation pit as a dividing basis, and dividing the influence degree of the confined water on the foundation pit into four levels, namely a first level, a second level, a third level and a fourth level from high to low according to the thickness of the confined water layer, the water level depth value of the confined water layer and the water inflow factor of a single well, wherein the four levels are as shown in table 1:
TABLE 1 grading of the impact degree of confined water on the foundation pit
Wherein, when the influence degree of the confined water on the foundation pit is graded, if the thickness of the confined water layer is thick<6m, directly dividing into four stages; if the water burst amount of a single well is more than 500m3D, when the influence degree grade is two-grade or three-grade, the influence degree grade is increased by one grade;
s3, grading the control level of the confined water of the foundation pit, and specifically comprising the following steps: according to the foundation pit safety grade and the confined water influence degree received by the foundation pit, the foundation pit confined water control grade is graded, and the foundation pit confined water control grade is divided into four grades of one grade, two grades, three grades and four grades from high to low, as shown in table 2:
TABLE 2 control of confined water in foundation pits
S4, selecting a pressure-bearing water treatment scheme according to the classification, specifically as follows: and selecting a confined water treatment scheme according to the control grades of the confined water of the foundation pit in a grading way, wherein the scheme is shown in a table 3:
TABLE 3 classification treatment method for confined water of foundation pit
| Control grade of confined water of foundation pit | Treatment protocol |
| First stage | Completely isolated confined water |
| Second stage | Depressurization in pit and recharge outside pit |
| Three-stage | Depressurization in pit |
| Four stages | Completely cut off pressure-bearing water or reduce pressure in pit |
；
S5, combining different construction methods, drawing up a plurality of alternative confined water control schemes, which specifically comprises: analyzing the advantages and disadvantages of different construction process methods based on a classified treatment method of the confined water of the foundation pit, selecting a proper treatment method for the treatment method of the confined water of the foundation pit, and determining a control scheme of alternative confined water;
s6, determining an optimal scheme based on multi-objective optimization, specifically comprising: and performing multi-objective optimization analysis by combining all limiting factors, and completing the optimization analysis of the alternative confined water control scheme to obtain a recommended scheme meeting the selection conditions and the selection suggestions thereof.
In step S1, the influence factors of the hydrogeological parameter model include: 1) form and position factors mainly comprise diving and confined water burial depth, thickness and influence range of surrounding buildings; 2) the physical indexes mainly comprise soil body mechanical indexes, permeability coefficients, confined water quality, a water level depth reduction value of a confined water layer, corrosivity and single-well water inflow.
In the step S3, the safety level of the foundation pit is divided into a first level, a second level and a third level according to the requirements of the acceptance standard for construction quality of foundation engineering of building foundation GB50202-2002 and the complexity, excavation depth and environmental requirements of the surrounding environment; or according to the requirements in the building foundation design Specification GB50007-2011, the building foundation design Specification is divided into a first level, a second level and a third level according to the complexity of the foundation, the scale and the functional characteristics of the building and the degree of damage to the building or influence on normal use caused by the foundation problem.
In the step S5, the evaluation criteria of the construction process method include the formation adaptability, the wall depth, the wall thickness, the water-proof effect and the construction cost; the treatment method comprises a waterproof curtain technology and a precipitation technology, wherein the waterproof curtain technology comprises an equal-thickness cement soil stirring continuous wall, a traditional profile steel three-axis cement soil stirring wall, an ultra-deep rigid three-axis cement soil stirring wall, a bored pile, an underground continuous wall, an RJP construction method, an MJS construction method and an N-JET construction method; the dewatering technology comprises a light well point, a jet well point, an electroosmosis well point, a drainage and seepage well point, a tube well point and a radiation well point.
In step S6, the limiting factors include engineering economy, structural durability, engineering importance, long-term adjustment capability, influence degree of disturbance, difficulty of construction, and ecological balance.
Compared with the prior art, the invention has the advantages that:
(1) the applicability is strong, and the refinement degree is high. The invention classifies the types of the confined water influence on different foundation pits, grades the confined water control grades, further evaluates the advantages and disadvantages of different confined water treatment schemes according to different construction method processes and other limiting factors, searches a better treatment scheme on the premise of ensuring the control effect, and is suitable for foundation pit confined water control under various engineering conditions.
(2) High reliability and analysis and quantification. The invention adopts the grading model and simultaneously reasonably adjusts the evaluation grade by assisting the correction factor, has high reliability, can analyze the confined water of the foundation pit under the non-background condition, and more accurately and reasonably evaluates the influence of the confined water change on the surrounding environment in the foundation pit construction.
(3) The comprehensive evaluation system has engineering guidance significance. According to the invention, on the basis of an accurate model, multi-objective optimization analysis is carried out on the limiting factors such as engineering economy and the like, and quantitative comparison is carried out to evaluate each alternative control scheme, so that an optimized scheme under the specified requirement is obtained, the relation among all the consideration factors of the engineering is balanced, the economy, the safety and the feasibility are taken into consideration, and the method has extremely high guiding significance for selecting the foundation pit confined water control scheme.
In summary, the invention discloses a classification and multi-objective optimization method for determining a foundation pit confined water control scheme for the first time, and provides a classification and multi-objective optimization method for determining a foundation pit confined water control scheme, which is quantitative, fine and engineering instructive, so that the influence of confined water change on the surrounding environment can be accurately evaluated according to the types of confined water in different foundation pits, thereby balancing other limiting factors such as engineering investment, safety, environment, ecology and the like, realizing evaluation of the confined water control scheme, and providing scientific basis for final determination of the confined water control scheme.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of the control effect-engineering cost dual-target optimization of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
A classification and multi-objective optimization method for determining a foundation pit confined water control scheme is disclosed, as shown in figure 1, the influence of confined water change on the surrounding environment can be accurately evaluated according to the types of confined water in different foundation pits, so that other limiting factors such as engineering investment, engineering safety, environment, ecology and the like are balanced, the evaluation on the confined water control scheme is realized, and a scientific basis is provided for the final determination of the confined water control scheme. The method specifically comprises the following steps:
s1, collecting data, investigating and establishing a site hydrogeological parameter model, wherein the influence factors of the hydrogeological parameter model comprise: 1) form and position factors mainly comprise diving and confined water burial depth, thickness and influence range of surrounding buildings; 2) the physical indexes mainly comprise soil body mechanical indexes, permeability coefficients, confined water quality, corrosivity and single well water inflow;
s2, classifying the influence degree of confined water on the foundation pit, specifically comprising: combining the established hydrogeological parameter model, selecting a confined water layer (namely a layer to be precipitated or a layer to be isolated) which has the largest influence on the foundation pit as a dividing basis, and dividing the influence degree of the confined water on the foundation pit into four levels, namely a first level, a second level, a third level and a fourth level from high to low according to the thickness of the confined water layer, the water level depth value of the confined water layer and the water inflow factor of a single well, wherein the four levels are as shown in table 1:
TABLE 1 grading of the impact degree of confined water on the foundation pit
Wherein, when the influence degree of the confined water on the foundation pit is graded, if the thickness of the confined water layer is thick<6m, directly dividing into four stages; if the water burst amount of a single well is more than 500m3D, when the influence degree grade is two-grade or three-grade, the influence degree grade is increased by one grade;
s3, grading the control level of the confined water of the foundation pit, and specifically comprising the following steps: the foundation pit confined water control degree is classified by combining the foundation pit control grade and the confined water influence grade, wherein the classification is divided into four grades from high to low, the classification grade is higher, and the control degree is higher, specifically as follows: according to the foundation pit safety level and the confined water influence degree received by the foundation pit, the control level of the confined water of the foundation pit is classified, and the control level of the confined water is divided into four levels, namely a first level, a second level, a third level and a fourth level, as shown in a table 2:
TABLE 2 control of confined water in foundation pits
The safety grade of the foundation pit is divided into a first grade, a second grade and a third grade according to the requirements of 'construction quality acceptance criteria for foundation engineering of building foundation' GB50202-2002 and the complexity degree of the surrounding environment, the excavation depth, the environmental requirements and the like; or according to the requirements in the building foundation design Specification GB50007-2011, the building is divided into a first level, a second level and a third level (which correspond to the first level, the second level and the third level in the table 2 respectively) according to the complexity of the foundation, the scale and the functional characteristics of the building and the degree that the building is damaged or the normal use is influenced due to the foundation problem;
s4, selecting a pressure-bearing water treatment scheme according to the classification, specifically as follows: and selecting a confined water treatment scheme according to the control grades of the confined water of the foundation pit in a grading way, wherein the scheme is shown in a table 3:
TABLE 3 classification treatment method for confined water of foundation pit
| Control grade of confined water of foundation pit | Treatment protocol |
| First stage | Completely isolated confined water |
| Second stage | Depressurization in pit and recharge outside pit |
| Three-stage | Depressurization in pit |
| Four stages | Completely cut off pressure-bearing water or reduce pressure in pit |
；
S5, drawing up various alternative control schemes by combining different construction methods;
based on the classified treatment method of the confined water of the foundation pit, the advantages and disadvantages of different construction process methods under a specific treatment scheme can be analyzed, a proper treatment method is selected by taking the advantages and disadvantages as the treatment method, and an alternative treatment scheme is determined, wherein the advantages and disadvantages of the construction process method include but are not limited to stratum adaptability, wall forming depth, wall forming thickness, water-resisting effect, characteristics and construction cost. For a specific treatment construction method, the waterproof curtain technology comprises but is not limited to an equal-thickness cement-soil stirring continuous wall, a traditional profile steel triaxial cement-soil stirring wall, an ultra-deep rigid triaxial cement-soil stirring wall, a bored pile, an underground continuous wall, an RJP construction method, an MJS construction method and an N-JET construction method; precipitation techniques include, but are not limited to, light well points, jet well points, electroosmotic well points, draw-and-seep well points, tube well points, and radiation well points;
s6, determining an optimal scheme based on multi-objective optimization, specifically comprising: and performing multi-objective optimization analysis by combining all limiting factors, and completing the optimization analysis of the alternative confined water control scheme to obtain a recommended scheme meeting the selection conditions and the selection suggestions thereof. Various alternative treatment schemes can be optimally evaluated by combining various limiting factors, wherein the limiting factors include but are not limited to engineering economy, structural durability, engineering importance, long-term adjustment capacity, disturbance influence degree, construction difficulty and ecological balance.
As shown in fig. 2, taking a dual-objective optimization analysis of control effect-engineering cost as an example, the relationship between the control effect and the engineering cost of multiple alternatives is analyzed, and the pareto frontier can be found through multiple existing codes, it should be noted that the alternatives on the pareto frontier are all superior to the alternatives other than the frontier, and the alternatives on the frontier have no good or bad difference, so the alternatives on the pareto frontier can be used as the final alternatives. Considering that the manufacturing cost is one of the main influence factors of the actual construction scheme selection, a final scheme can be selected by combining with an allowable value, and a scheme on the front edge of the pareto can be further screened by further combining with other limiting factors through hierarchical analysis.
The above description is not intended to limit the present invention, and the present invention is not limited to the above examples. Those skilled in the art should also realize that changes, modifications, additions and substitutions can be made without departing from the true spirit and scope of the invention.
Claims (5)
1. A classification and multi-objective optimization method for determining a foundation pit confined water control scheme is characterized by comprising the following steps of:
s1, collecting data, investigating and establishing a site hydrogeological parameter model;
s2, classifying the influence degree of confined water on the foundation pit, specifically comprising: combining the established hydrogeological parameter model, selecting a confined water layer with the largest influence on the foundation pit as a dividing basis, and dividing the influence degree of the confined water on the foundation pit into four levels, namely a first level, a second level, a third level and a fourth level from high to low according to the thickness of the confined water layer, the water level depth value of the confined water layer and the water inflow factor of a single well, as shown in table 1:
TABLE 1 grading of the impact degree of confined water on the foundation pit
Wherein, when the influence degree of the confined water on the foundation pit is graded, if the thickness of the confined water layer is thick<6m, directly dividing into four stages; if the water burst amount of a single well is more than 500m3D, when the influence degree grade is two-grade or three-grade, the influence degree grade is increased by one grade;
s3, grading the control level of the confined water of the foundation pit, and specifically comprising the following steps: according to the foundation pit safety grade and the confined water influence degree received by the foundation pit, the foundation pit confined water control grade is graded, and the foundation pit confined water control grade is divided into four grades of one grade, two grades, three grades and four grades from high to low, as shown in table 2:
TABLE 2 control of confined water in foundation pits
S4, selecting a pressure-bearing water treatment scheme according to the classification, specifically as follows: and selecting a confined water treatment scheme according to the control grades of the confined water of the foundation pit in a grading way, wherein the scheme is shown in a table 3:
TABLE 3 classification treatment method for confined water of foundation pit
；
S5, combining different construction methods, drawing up a plurality of alternative confined water control schemes, which specifically comprises: analyzing the advantages and disadvantages of different construction process methods based on a classified treatment method of the confined water of the foundation pit, selecting a proper treatment method for the treatment method of the confined water of the foundation pit, and determining a control scheme of alternative confined water;
s6, determining an optimal scheme based on multi-objective optimization, specifically comprising: and performing multi-objective optimization analysis by combining all limiting factors, and completing the optimization analysis of the alternative confined water control scheme to obtain a recommended scheme meeting the selection conditions and the selection suggestions thereof.
2. The classification and multi-objective optimization method for determining the foundation pit confined water control scheme as claimed in claim 1, wherein: in the step S1, the influence factors of the hydrogeological parameter model include form and position factors and physical property indexes, wherein the form and position factors include diving and confined water burial depth, thickness and peripheral building influence range; the physical indexes comprise soil body mechanical indexes, permeability coefficients, confined water quality, a water level depth reduction value of a confined water layer, corrosivity and single well water inflow.
3. The classification and multi-objective optimization method for determining the foundation pit confined water control scheme as claimed in claim 1, wherein: in the step S3, the safety level of the foundation pit is divided into a first level, a second level and a third level according to the requirements of the acceptance standard for construction quality of foundation engineering of building foundation GB50202-2002 and the complexity, excavation depth and environmental requirements of the surrounding environment; or according to the requirements in the building foundation design Specification GB50007-2011, the building foundation design Specification is divided into a first level, a second level and a third level according to the complexity of the foundation, the scale and the functional characteristics of the building and the degree of damage to the building or influence on normal use caused by the foundation problem.
4. The classification and multi-objective optimization method for determining the foundation pit confined water control scheme as claimed in claim 1, wherein: in the step S5, the evaluation criteria of the construction process method include the formation adaptability, the wall depth, the wall thickness, the water-proof effect and the construction cost; the treatment method comprises a waterproof curtain technology and a precipitation technology, wherein the waterproof curtain technology comprises an equal-thickness cement soil stirring continuous wall, a traditional profile steel three-axis cement soil stirring wall, an ultra-deep rigid three-axis cement soil stirring wall, a bored pile, an underground continuous wall, an RJP construction method, an MJS construction method and an N-JET construction method; the dewatering technology comprises a light well point, a jet well point, an electroosmosis well point, a drainage and seepage well point, a tube well point and a radiation well point.
5. The classification and multi-objective optimization method for determining the foundation pit confined water control scheme as claimed in claim 1, wherein: in step S6, the limiting factors include engineering economy, structural durability, engineering importance, long-term adjustment capability, influence degree of disturbance, difficulty of construction, and ecological balance.
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