CN108643246B - The prediction technique that artesian water precipitation influences surrounding enviroment in foundation pit construction - Google Patents
The prediction technique that artesian water precipitation influences surrounding enviroment in foundation pit construction Download PDFInfo
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- CN108643246B CN108643246B CN201810285164.1A CN201810285164A CN108643246B CN 108643246 B CN108643246 B CN 108643246B CN 201810285164 A CN201810285164 A CN 201810285164A CN 108643246 B CN108643246 B CN 108643246B
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- water precipitation
- artesian water
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- surrounding enviroment
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
Abstract
The present invention provides the prediction technique that artesian water precipitation influences surrounding enviroment in a kind of foundation pit construction, comprising: obtains place surrounding enviroment, engineering geological condition and each soil parameters；Artesian water precipitation computation model is established in fluid structurecoupling numerical software；The first prediction result is obtained according to precipitation Work condition analogue；Second prediction result is calculated using One-dimensional Consolidation Theory；First prediction result at same construction location is divided by second prediction result, it obtains and calculates the layerwise summation method empirical coefficient that artesian water precipitation causes ground settlement, according to the obtained layerwise summation method empirical coefficient, influence of the artesian water precipitation to surrounding enviroment in foundation pit construction is predicted.The present invention is by rationally designing and determining that artesian water precipitation causes the layerwise summation method empirical coefficient of ground settlement, consider the influence of fluid structure interaction and three-dismensional effect to layerwise summation method, influence of the artesian water precipitation to surrounding enviroment in foundation pit construction can be more accurately predicted.
Description
Technical field
The present invention relates to the methods of technical field of civil, and in particular, to artesian water precipitation in a kind of foundation pit construction
The prediction technique that surrounding enviroment are influenced.
Background technique
In recent years, China coast soft clay area urban construction rhythm is constantly accelerated, the scale and depth of underground space development
It continues to increase, so that the pressure-bearing water problems that underground engineering construction is faced is also more and more prominent.It is shallower in artesian aquifer buried depth
Area, in order to guarantee engineering construction safety, it has to artesian water carry out Dewatering by pressure reduction.Long-term a large amount of artesian water precipitation makes
The change of artesian head variation and stress field is obtained, so as to cause the deformation of surrounding soil, adverse effect is generated to ambient enviroment, very
To there is engineering accident, such as differential settlement of buildings causes cracking, underground utilities explosion.Therefore, accurately prediction drop is held
Influence of the water to ambient enviroment is pressed to be of great significance.
Mainly two-phase method is used to calculate soil deformation caused by dewatering confined water in Practical Project at present, the party
Method first uses seepage field caused by the seepage flow software simulated precipitation such as Modelflow, and initial seepage field and final seepage field are made the difference
Pore pressure change value can be obtained, deformation is then calculated using One-dimensional Consolidation Theory, is finally multiplied before the deformation result being calculated
It is modified with empirical coefficient.In " Code for design of building " specification, it is proposed that the value coefficient of layerwise summation method is
0.2.Then the empirical coefficient fails to consider influence of the fluid structure interaction to deformation, in addition, single sinking is axisymmetric problem,
Skirt well precipitation is three-dimensional problem, and single empirical coefficient can not consider the influence of three-dimensional space effect, thus can not be accurately pre-
Survey influence of the artesian water precipitation to surrounding enviroment in foundation pit construction.
Find have perhaps by prior art documents for improving the application of layerwise summation method in practical projects
More researchs.Wang Tie rows in 1996 and Zhao Shude are in " Xi'an University of Architecture and Technology's journal " (1996,28 (2), pp.179-182)
" analysis and improvement that the calculate settlement of foundation layerwise summation method defect " text delivered by a large amount of FEM calculations, finds out error
Size and the regularity of distribution, and obtain the modification method suitable for homogeneous foundation and general stratified foundation.Bai Dexin in 2011 and
" the modified layer-summation of Embankment Subsidence analysis that Xu Nianchun etc. is delivered in " Jiangsu building " (2011, No.6, pp.86-88)
A research " text is adjusted with calculating settlement of foundation coefficient using numerical Method Research layerwise summation method.But the above research is all
It is for the calculating for causing the soil body to compress under external load effect.
Artesian water precipitation is related to fluid structurecoupling and three-dimensional space effect, calculates deformation to experience using layerwise summation method at present
Coefficient rely on it is big, can not influence of the artesian water precipitation to surrounding enviroment in Accurate Prediction foundation pit construction.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide artesian water precipitation in a kind of foundation pit construction to periphery
The prediction technique that environment influences, by rationally designing and determining that artesian water precipitation causes the layerwise summation method experience system of ground settlement
Number considers the influence of fluid structure interaction and three-dismensional effect to layerwise summation method, can be more accurately predicted in foundation pit construction
Influence of the artesian water precipitation to surrounding enviroment.
In order to achieve the above object, the present invention provides the prediction that artesian water precipitation influences surrounding enviroment in a kind of foundation pit construction
Method, which comprises
Obtain construction site surrounding enviroment, engineering geological condition and each soil parameters；
Condition and parameter based on acquisition establish artesian water precipitation computation model in fluid structurecoupling numerical software, according to
Precipitation operating condition is simulated, and the analog result of the pore pressure distribution in the first prediction result and entire model is obtained；Described first
Prediction result is to consider that the prediction artesian water precipitation of fluid structurecoupling causes the analog result of ground settlement；
Changed according to the pore pressure of above-mentioned model, the second prediction result is calculated using One-dimensional Consolidation Theory, described second
Prediction result is that the artesian water precipitation of One-dimensional Consolidation Theory prediction causes the result of ground settlement；
By the first prediction result at same construction location divided by the second prediction result, obtains calculating artesian water precipitation and cause
The layerwise summation method empirical coefficient of ground settlement is predicted in foundation pit construction according to the obtained layerwise summation method empirical coefficient
Influence of the artesian water precipitation to surrounding enviroment.
Preferably, the construction site engineering geological condition and each soil parameters include:
The distribution situation and mechanics parameter index of each soil layer；
The hydraulic parameters index of hydrogeologic condition and each soil layer.
Preferably, the artesian water precipitation computation model is threedimensional model.
Preferably, the artesian water precipitation computation model, horizontal boundary are greater than the coverage of artesian water precipitation.
It is highly preferred that the Rainfall Influence range is calculated according to the following formula:
Wherein: SwFor maximum stage drawdown in well, k is artesian aquifer infiltration coefficient.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The present invention simulates artesian water precipitation using wind-structure interaction method, while it is heavy to obtain the distribution of stratum pore pressure and earth's surface
Drop, it will be considered that the prediction artesian water precipitation of fluid structurecoupling causes the analog result of ground settlement to be held with what One-dimensional Consolidation Theory was predicted
Pressure water precipitation causes the result of ground settlement to combine, while considering fluid structure interaction and three-dismensional effect to layerwise summation method
Influence, influence of the artesian water precipitation to surrounding enviroment can be more accurately predicted, be existing artesian water precipitation caused by
The engineerings such as soil deformation provide guidance, have important practical application value.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the method flow diagram of one embodiment of the invention；
Fig. 2 is the ground settlement being calculated using fluid structurecoupling method and One-dimensional Consolidation Theory of one embodiment of the invention
Curve graph；
Fig. 3 is the layerwise summation method empirical coefficient scatter chart of one embodiment of the invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
The present invention provides the prediction technique that artesian water precipitation influences surrounding enviroment in a kind of foundation pit construction, while using examining
The prediction artesian water precipitation for considering fluid structurecoupling causes the analog result of ground settlement and is calculated one using One-dimensional Consolidation Theory
Dimension consolidation theory prediction artesian water precipitation cause ground settlement as a result, artesian water precipitation can be more accurately predicted to week
The influence of surrounding environment.
Specifically, as shown in Figure 1, the process of the prediction technique influenced for artesian water precipitation in foundation pit construction on surrounding enviroment
Figure, below in conjunction with specific embodiment, is described in detail the method.
In an embodiment of the present invention, the prediction technique that artesian water precipitation influences surrounding enviroment in a kind of foundation pit construction,
Include the following steps:
S1, surrounding enviroment, engineering geological condition and each soil parameters are determined
Construction site engineering geological condition and each soil parameters mainly include following two part: first is that the distribution of each soil layer
Situation and mechanics parameter index；Second is that the hydraulic parameters index of hydrogeologic condition and each soil layer.As shown in table 1.
Table 1: each soil layer calculating parameter
S2, artesian water precipitation computation model is established in fluid structurecoupling numerical software；
Artesian water precipitation computation model is threedimensional model；
The horizontal boundary of artesian water precipitation computation model should be greater than the coverage of artesian water precipitation in foundation pit, further
, Rainfall Influence range can be calculated according to the following formula:
Wherein: SwFor maximum stage drawdown in well, k is artesian aquifer infiltration coefficient.
S3, it is simulated according to precipitation process, obtains the mould of the pore pressure distribution in the first prediction result and entire model
Quasi- result；First prediction result is to consider that the prediction artesian water precipitation of fluid structurecoupling causes the analog result of ground settlement,
As shown in Figure 2；
S4, changed according to the pore pressure that above-mentioned modeling obtains, the second prediction knot is calculated using One-dimensional Consolidation Theory
Fruit, second prediction result for the artesian water precipitation that One-dimensional Consolidation Theory is predicted cause ground settlement as a result, such as Fig. 2 institute
Show；
Specifically, in embodiments of the present invention, being layered using finite element unit grid, the pore pressure of each node is extracted,
It is made the difference with Initial Excess Pore Water Pressure value and acquires pore pressure knots modification, the decrement S of each layer is then acquired using One-dimensional Consolidation Theoryi, i.e.,
Wherein: Δ uiFor pore pressure knots modification in each layer, EsiFor each layer compression modulus, hiIt is respectively thick layer by layer.
Finally the decrement of different depth is summed to obtain ground settlement S, i.e.,
As shown in Fig. 2, to use fluid structurecoupling method and One-dimensional Consolidation Theory to be calculated obtained in the present embodiment
Ground settlement curve graph, i.e., the first above-mentioned prediction result and the second prediction result curve graph.
The first prediction result obtained according to fluid structurecoupling number can obtain considering that fluid structurecoupling and three-dismensional effect descending water draw
The ground settlement risen；The second prediction result is obtained using One-dimensional Consolidation Theory according to the change of pore pressure, two results are divided by, are obtained
The empirical coefficient of layerwise summation methodThe distance relation of the empirical coefficient and construction well is as shown in Figure 3.
The layerwise summation method empirical coefficient that S5, basis obtain predicts ground caused by artesian water precipitation in foundation pit construction
Table sedimentation value S':
Obtained ground settlement value S' and foundation pit deformation in prior art specification " architecture Foundation Pit Engineering technical specification " are set
Con trolling index and all kinds of building protection Comparison of standards are counted, judges base pit dewatering to the influence degree of environment.
From above-described embodiment as can be seen that the present invention considers fluid structure interaction and three-dismensional effect to layerwise summation method simultaneously
Influence, by rationally designing and determining that artesian water precipitation causes the layerwise summation method empirical coefficient of ground settlement, so as to
Influence of the artesian water precipitation to surrounding enviroment in foundation pit construction is more accurately predicted.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (7)
1. the prediction technique that artesian water precipitation influences surrounding enviroment in a kind of foundation pit construction, which is characterized in that the method packet
It includes:
Obtain construction site surrounding enviroment, engineering geological condition and each soil parameters；
Condition and parameter based on acquisition establish artesian water precipitation computation model, according to precipitation in fluid structurecoupling numerical software
Operating condition is simulated, and the analog result of the pore pressure distribution in the first prediction result and entire model is obtained；First prediction
As a result the prediction artesian water precipitation for consideration fluid structurecoupling causes the analog result of ground settlement；
According to the pore pressure that above-mentioned simulation obtains, the second prediction result, second prediction are calculated using One-dimensional Consolidation Theory
As a result the artesian water precipitation for One-dimensional Consolidation Theory prediction causes the result of ground settlement；
First prediction result at same construction location obtains calculating artesian water precipitation and draws divided by second prediction result
The layerwise summation method empirical coefficient for playing ground settlement predicts foundation pit construction according to the obtained layerwise summation method empirical coefficient
Influence of the middle artesian water precipitation to surrounding enviroment.
2. the prediction technique that artesian water precipitation influences surrounding enviroment in foundation pit construction according to claim 1, feature
It is, the construction site engineering geological condition and each soil parameters include:
The distribution situation and mechanics parameter index of each soil layer；
The hydraulic parameters index of hydrogeologic condition and each soil layer.
3. the prediction technique that artesian water precipitation influences surrounding enviroment in foundation pit construction according to claim 1, feature
It is, the artesian water precipitation computation model is threedimensional model.
4. the prediction technique that artesian water precipitation influences surrounding enviroment in foundation pit construction according to claim 3, feature
It is, the artesian water precipitation computation model, horizontal boundary is greater than the coverage of artesian water precipitation.
5. the prediction technique that artesian water precipitation influences surrounding enviroment in foundation pit construction according to claim 4, feature
It is, the coverage of the artesian water precipitation is calculated according to the following formula:
Wherein: SwFor maximum stage drawdown in well, k is artesian aquifer infiltration coefficient.
6. the prediction side that artesian water precipitation influences surrounding enviroment in foundation pit construction according to claim 1-5
Method, which is characterized in that the second prediction knot is calculated using One-dimensional Consolidation Theory in the pore pressure obtained according to above-mentioned simulation
Fruit refers to: being layered using finite element unit grid, extracts the pore pressure of each node, made the difference with Initial Excess Pore Water Pressure value and acquire pore pressure
Then knots modification acquires the decrement S of each layer using One-dimensional Consolidation Theoryi, i.e.,
Wherein: Δ uiFor pore pressure knots modification in each layer, EsiFor each layer compression modulus, hiIt is respectively thick layer by layer；
Finally the decrement of different depth is summed to obtain ground settlement S, i.e.,
7. the prediction side that artesian water precipitation influences surrounding enviroment in foundation pit construction according to claim 1-5
Method, which is characterized in that according to the obtained layerwise summation method empirical coefficientArtesian water precipitation causes in prediction foundation pit construction
Ground settlement value S':
Wherein: Δ uiFor pore pressure knots modification in each layer, EsiFor each layer compression modulus, hiIt is respectively thick layer by layer；
Foundation pit deformation design in obtained ground settlement value S' and prior art specification " architecture Foundation Pit Engineering technical specification " is controlled
Index processed and all kinds of building protection Comparison of standards, judge base pit dewatering to the influence degree of environment.
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