CN117436164A - Planning method and planning system for soft soil deep foundation pit earthwork excavation construction scheme - Google Patents
Planning method and planning system for soft soil deep foundation pit earthwork excavation construction scheme Download PDFInfo
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- CN117436164A CN117436164A CN202311261467.7A CN202311261467A CN117436164A CN 117436164 A CN117436164 A CN 117436164A CN 202311261467 A CN202311261467 A CN 202311261467A CN 117436164 A CN117436164 A CN 117436164A
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- 238000010276 construction Methods 0.000 title claims abstract description 149
- 239000002689 soil Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 69
- 238000013439 planning Methods 0.000 title claims abstract description 36
- 238000009412 basement excavation Methods 0.000 title claims abstract description 28
- 238000004088 simulation Methods 0.000 claims abstract description 19
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Abstract
The invention relates to the technical field of construction planning, and discloses a planning method and a planning system for a soft soil deep foundation pit earthwork excavation construction scheme, wherein the planning method comprises the following steps: acquiring a soft soil type and soil parameters of soft soil of a target construction area, and selecting a corresponding constitutive model according to the soft soil type; determining an influence range of deep foundation pit construction, and collecting load parameters of a building in the influence range; constructing a three-dimensional numerical simulation model according to soil parameters, the constitutive model and the load parameters, and analyzing deformation influence of a deep foundation pit construction process on a building in an influence range through the three-dimensional numerical simulation model; adjusting the deep foundation pit construction procedure of the target construction area based on deformation influence, and determining an optimal deformation control construction scheme; according to the invention, the deformation control value generated by each construction procedure is known by analyzing the mode of each construction procedure, and an optimal deformation control construction scheme is provided for the deep foundation pit.
Description
Technical Field
The invention relates to the technical field of construction planning, in particular to a planning method and a planning system for a soft soil deep foundation pit earthwork excavation construction scheme.
Background
With the rapid development of underground construction technology, the application of underground construction schemes is more and more widespread, and when underground construction is performed, a common scheme is to use a deep foundation pit engineering construction method, namely, an engineering with a depth of more than 5 meters or a depth of less than 5 meters in a target construction area, but very complex geological conditions, surrounding environments and underground pipelines. At present, the deep foundation pit engineering mainly takes deformation control during design planning to control the deformation influence of engineering construction on surrounding buildings, but the existing deformation control is limited to the total deformation accumulated value of the surrounding buildings, the influence of each subsection project on the deformation control of the surrounding and surrounding environment buildings of the foundation pit is not considered and analyzed, and under the characteristics of high and difficult requirements on the deformation control of soft soil deep foundation pit in a complex environment, the deformation control value of the foundation pit and the surrounding environment is required to be decomposed into each construction procedure for limited control, and the deformation control early warning value of each stage is required to be set. Therefore, the existing deep foundation pit construction planning method has the problem of poor control precision of surrounding environment deformation values.
Disclosure of Invention
The invention provides a planning method and a planning system for a soft soil deep foundation pit earthwork excavation construction scheme, which are used for solving the problem that the existing deep foundation pit construction planning method is poor in control accuracy of surrounding environment deformation values.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, the invention provides a method for planning a soft soil deep foundation pit earthwork excavation construction scheme, which comprises the following steps:
acquiring a soft soil type and soil parameters of soft soil of a target construction area, and selecting a corresponding constitutive model according to the soft soil type;
determining an influence range of deep foundation pit construction, and collecting load parameters of a building in the influence range;
constructing a three-dimensional numerical simulation model according to the soil parameters, the constitutive model and the load parameters, and analyzing the deformation influence of the deep foundation pit construction process on the building in the influence range through the three-dimensional numerical simulation model;
and adjusting the deep foundation pit construction procedure of the target construction area based on the deformation influence, and determining the deformation control optimal construction scheme.
Optionally, the obtaining the soft soil type and the soil parameters of the soft soil in the target construction area includes:
and performing on-site investigation on the soft soil of the target construction area, and determining the soft soil type and the soil parameters of the soft soil of the target construction area based on the on-site investigation result.
Optionally, the selecting a corresponding constitutive model according to the soft soil type includes:
when the soft soil type is complex soft soil type, a small strain elastoplastic model is selected as a constitutive model;
and when the soft soil type is a soft soil type with small strain parameters which are difficult to obtain, selecting a hardening elastoplastic model as the constitutive model.
Optionally, the collecting load parameters of the building in the influence range includes:
and carrying out field investigation on the building in the influence range to obtain the position relation between the building and the target construction area, the foundation form of the building and the load born by the foundation, and taking the position relation, the foundation form and the load born by the foundation as load parameters of the building.
Optionally, the analyzing, by using a three-dimensional numerical simulation model, the deformation influence of the deep foundation pit construction process on the building in the influence range includes:
analyzing construction live load, peripheral pile load, traffic live load and groundwater seepage of a deep foundation pit construction process through a three-dimensional numerical simulation model, and calculating a deformation control value of a building in the influence range;
and taking the deformation control value and the deformation influence of the building in the influence range as construction live load, peripheral pile load, traffic live load and groundwater seepage.
Optionally, the adjusting the deep foundation pit construction procedure of the target construction area based on the deformation influence includes:
and controlling an optimal construction scheme according to the deformation influence, and adjusting the deep foundation pit construction procedure by combining the deformation control value.
Optionally, the method further comprises:
early warning is carried out based on the deep foundation pit construction procedure of the target construction area, wherein an early warning mechanism comprises:
the data is stable and controllable, and the foundation pit and the environment deformation at the lower stage are predicted to guide construction through parameter optimization according to normal dynamic construction;
when the deformation is too large and approaches or exceeds the designated safety control standard, comprehensively analyzing the factors influencing the environmental change according to the monitoring result, and taking measures in time.
The invention provides a soft soil deep foundation pit earthwork excavation construction scheme planning system, which comprises a processor and a memory, wherein the processor is used for processing the soft soil deep foundation pit earthwork excavation construction scheme planning system;
a memory for storing a computer program;
a processor for implementing the method steps of any one of the first aspects when executing a program stored on a memory.
The beneficial effects are that:
according to the planning method for the earthwork excavation construction scheme of the soft soil deep foundation pit, the soft soil type and the soil parameters of the soft soil of a target construction area are obtained, and a corresponding constitutive model is selected according to the soft soil type; determining an influence range of deep foundation pit construction, and collecting load parameters of a building in the influence range; constructing a three-dimensional numerical simulation model according to the soil parameters, the constitutive model and the load parameters, and analyzing the deformation influence of the deep foundation pit construction process on the building in the influence range through the three-dimensional numerical simulation model; adjusting the deep foundation pit construction procedure of the target construction area based on the deformation influence, and determining a deformation control optimal construction scheme; according to the method, the deformation control value generated by each construction procedure is known by analyzing the mode of each construction procedure, and the problem that the deformation value is difficult to control under the condition that the surrounding environment is complex in the existing deep foundation pit construction planning method is solved.
Drawings
Fig. 1 is a flowchart of a method for planning a soft soil deep foundation pit earthwork excavation construction scheme according to a preferred embodiment of the present invention.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
Example 1
Referring to fig. 1, an embodiment of the present application provides a method for planning a soil excavation construction scheme of a soft soil deep foundation pit, including:
acquiring a soft soil type and soil parameters of soft soil of a target construction area, and selecting a corresponding constitutive model according to the soft soil type;
determining an influence range of deep foundation pit construction, and collecting load parameters of a building in the influence range;
constructing a three-dimensional numerical simulation model according to the soil parameters, the constitutive model and the load parameters, and analyzing the deformation influence of the deep foundation pit construction process on the building in the influence range through the three-dimensional numerical simulation model;
and adjusting the deep foundation pit construction procedure of the target construction area based on the deformation influence, and determining the deformation control optimal construction scheme.
Optionally, the obtaining the soft soil type and the soil parameters of the soft soil in the target construction area includes:
and performing on-site investigation on the soft soil of the target construction area, and determining the soft soil type and the soil parameters of the soft soil of the target construction area based on the on-site investigation result.
In the above embodiment, the soft soil type and the soil parameters of the soft soil in the target construction area are obtained, and the corresponding constitutive model is selected according to the soft soil type; determining an influence range of deep foundation pit construction, and collecting load parameters of a building in the influence range; constructing a three-dimensional numerical simulation model according to the soil parameters, the constitutive model and the load parameters, and analyzing the deformation influence of the deep foundation pit construction process on the building in the influence range through the three-dimensional numerical simulation model; adjusting the deep foundation pit construction procedure of the target construction area based on the deformation influence, and determining a deformation control optimal construction scheme; according to the method, the deformation control value generated by each construction procedure is known by analyzing the mode of each construction procedure, and the problem that the deformation value is difficult to control under the condition that the surrounding environment is complex in the existing deep foundation pit construction planning method is solved.
Optionally, the selecting a corresponding constitutive model according to the soft soil type includes:
when the soft soil type is complex soft soil type, a small strain elastoplastic model is selected as a constitutive model;
and when the soft soil type is a soft soil type with small strain parameters which are difficult to obtain, selecting a hardening elastoplastic model as the constitutive model.
Optionally, the collecting load parameters of the building in the influence range includes:
and carrying out field investigation on the building in the influence range to obtain the position relation between the building and the target construction area, the basic form of the building and the load born by the building, and taking the position relation, the basic form and the load born by the building as load parameters of the building.
Optionally, the analyzing, by using a three-dimensional numerical simulation model, the deformation influence of the deep foundation pit construction process on the building in the influence range includes:
analyzing construction live load, peripheral pile load, traffic live load and groundwater seepage of a deep foundation pit construction process through a three-dimensional numerical simulation model, and calculating a deformation control value of a building in the influence range;
and taking the deformation control value and the deformation influence of the building in the influence range as construction live load, peripheral pile load, traffic live load and groundwater seepage.
Optionally, the adjusting the deep foundation pit construction procedure of the target construction area based on the deformation influence includes:
and controlling an optimal construction scheme according to the deformation influence, and adjusting the deep foundation pit construction procedure by combining the deformation control value.
Optionally, the method further comprises:
early warning is carried out based on the deep foundation pit construction procedure of the target construction area, wherein an early warning mechanism comprises:
the data is stable and controllable, and the foundation pit and the environment deformation at the lower stage are predicted to guide construction through parameter optimization according to normal dynamic construction;
when the deformation is too large and approaches or exceeds the designated safety control standard, comprehensively analyzing the factors influencing the environmental change according to the detection result, and taking measures in time.
Example 2
1. Selecting an appropriate constitutive model
Hardened elastoplastic models such as HS model and MCC model, the deformation of wall body and the soil body behind the wall is relatively accurate, but the small strain characteristic of the soil body is not considered, and the influence range of the earth surface subsidence is larger. A Small strain elastoplastic model such as an HS-Small model is more suitable for analyzing the influence of foundation pit excavation on the surrounding environment. And (3) carrying out numerical calculation on the soft soil deep foundation pit in a complex environment, and suggesting to select a small strain elastoplastic model by the soil body constitutive model, so that the deformation of the surrounding environment can be predicted better, and the hardening elastoplastic model can be selected under the condition that small strain parameters are difficult to acquire.
2. Soil body parameter selection
In the aspect of soil parameters, the current deep foundation pit engineering investigation result mainly meets the calculation requirement of an elastic-ideal plastic model, and part of main parameters required by a hardening elastic-plastic model and a small-strain elastic-plastic model are not tested, so that accurate calculation results are difficult to obtain if the two model soil parameters are not obtained through tests or are not obtained through local experience parameters. At present, industries and related scholars also pay more and more attention to important roles of soil body small strain characteristics in predicting soil body deformation, and large-scale small strain parameter tests have been carried out on the places such as the sea, the Nanjing, the Jinan and the like to determine small strain hardening experience parameters of each soil layer in places. The small strain parameter of the soil layer in the soft soil area can be referred to the empirical parameter in the Shanghai area.
3. Load determination
Before construction, adjacent building (construction) structures in the main influence range of foundation pit engineering are researched, wherein the research contents comprise the position relation between the building (construction) structures and the foundation pit, the basic form of the building (construction) structures and the load born by the building (construction) structures (including live load and permanent load, and no specific data is determined according to the specification and the actual situation and experience).
4. Preliminary determination of site calculation model and clear construction procedure
And establishing a numerical model according to the determined contents of the constitutive model, soil parameters, loads, design drawings and the like, wherein the model establishment needs to meet the construction practice (including the consistency of model components and construction drawings, the consistency of excavation steps and construction planning procedures and the like), and the accuracy of a calculation result needs to meet engineering requirements.
5. Construction plan optimization
Before construction, the deformation influence of each sub-engineering construction procedure, especially foundation pit excavation, on adjacent building (structure) is analyzed through three-dimensional numerical simulation, and the influence of factors including construction live load, peripheral pile load, traffic live load, groundwater seepage and the like in construction environments is considered to determine the deformation control optimal construction scheme.
6. Deformation control value decomposition
And according to the optimal construction scheme of deformation control, combining the design deformation control value and the calculation result of each construction procedure, and determining the deformation control standard of each construction stage.
7. Dynamic construction
The early warning mechanism is as follows:
1) The data is stable and controllable, and the foundation pit and the environment deformation at the lower stage are predicted to guide the construction through parameter optimization according to normal dynamic construction.
2) When the deformation is too large and approaches or exceeds the established safety control standard, comprehensively analyzing the factors influencing the environmental change according to the monitoring result, and taking measures in time.
And comparing the numerical calculation result with the monitoring result in the whole construction process, reducing or amplifying the calculation parameters after the deformation value early warning, comparing and selecting a group of calculation parameters closest to the monitoring value after resetting a plurality of groups of calculation parameters, verifying by using the subsequent monitoring points, and repeating inversion work if deviation occurs. Some computing software such as Midas GTS has a parameter analysis function at present, and the operation can be rapidly realized.
The embodiment also provides a planning system for the earthwork excavation construction scheme of the soft soil deep foundation pit, which comprises a processor and a memory;
a memory for storing a computer program;
and the processor is used for realizing any one of the method steps in the planning method of the soil excavation construction scheme of the soft soil deep foundation pit when executing the program stored in the memory.
The system for planning the soil excavation construction scheme of the soft soil deep foundation pit can realize all the embodiments of the method for planning the soil excavation construction scheme of the soft soil deep foundation pit, can achieve the same beneficial effects, and is not repeated here.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. The planning method for the earthwork excavation construction scheme of the soft soil deep foundation pit is characterized by comprising the following steps of:
acquiring a soft soil type and soil parameters of soft soil of a target construction area, and selecting a corresponding constitutive model according to the soft soil type;
determining an influence range of deep foundation pit construction, and collecting load parameters of a building in the influence range;
constructing a three-dimensional numerical simulation model according to the soil parameters, the constitutive model and the load parameters, and analyzing the deformation influence of the deep foundation pit construction process on the building in the influence range through the three-dimensional numerical simulation model;
and adjusting the deep foundation pit construction procedure of the target construction area based on the deformation influence, and determining the deformation control optimal construction scheme.
2. The method for planning a soil excavation construction scheme of a soft soil deep foundation pit according to claim 1, wherein the obtaining the soft soil type and the soil parameters of the soft soil of the target construction area comprises:
and performing on-site investigation on the soft soil of the target construction area, and determining the soft soil type and the soil parameters of the soft soil of the target construction area based on the on-site investigation result.
3. The method for planning a soil excavation construction scheme of a soft soil deep foundation pit according to claim 1, wherein the selecting a corresponding constitutive model according to the soft soil type comprises:
when the soft soil type is complex soft soil type, a small strain elastoplastic model is selected as a constitutive model;
and when the soft soil type is a soft soil type with small strain parameters which are difficult to obtain, selecting a hardening elastoplastic model as the constitutive model.
4. The method for planning a soil excavation construction scheme of a soft soil deep foundation pit according to claim 1, wherein the collecting the load parameters of the building within the influence range comprises:
and carrying out field investigation on the building in the influence range to obtain the position relation between the building and the foundation pit construction area, the basic form of the building and the load of the building, and taking the position relation, the basic form and the total load of the building as load parameters in the foundation pit influence range.
5. The method for planning a soil excavation construction scheme of a soft soil deep foundation pit according to claim 1, wherein analyzing the deformation influence of the deep foundation pit construction process on the building within the influence range by using a three-dimensional numerical simulation model comprises: preliminarily determining various foundation pit excavation schemes according to construction conditions of a foundation pit construction site;
and calculating deformation influence of the building in the influence range under the influence of conditions such as construction load, peripheral pile load, traffic dynamic load, groundwater seepage and the like of different excavation schemes through a three-dimensional numerical simulation model.
6. The method for planning a deep foundation pit earth excavation construction scheme according to claim 1, wherein the adjusting the deep foundation pit construction process in the target construction area based on the deformation influence comprises:
and controlling an optimal construction scheme according to the deformation influence, and adjusting the deep foundation pit construction procedure by combining the deformation control value.
7. The method for planning a soft soil deep foundation pit earthwork excavation construction scheme according to claim 1, wherein the method further comprises:
early warning is carried out based on the deep foundation pit construction procedure of the target construction area, wherein an early warning mechanism comprises:
the data is stable and controllable, and the foundation pit and the environment deformation at the lower stage are predicted to guide construction through parameter optimization according to normal dynamic construction;
when the deformation is too large and approaches or exceeds the designated safety control standard, comprehensively analyzing the factors influencing the environmental change according to the monitoring result, and taking measures in time.
8. The system for planning the earthwork excavation construction scheme of the soft soil deep foundation pit is characterized by comprising a processor and a memory;
a memory for storing a computer program;
a processor for implementing the method steps of any one of claims 1-7 when executing a program stored on a memory.
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