CN110241870A - Layout method of foundation pit excavation monitoring system and foundation pit excavation monitoring system - Google Patents

Abstract

The invention belongs to the technical field of civil engineering, and in particular relates to a method for arranging a foundation pit excavation monitoring system and a foundation pit excavation monitoring system. The invention provides a method for arranging a foundation pit excavation monitoring system, including: establishing a foundation pit The generalized model of site engineering geology; the establishment of the excavation response analysis and calculation model of the foundation pit; the simulation of the excavation response of the foundation pit; the division of the impact range of the excavation deformation environment according to the simulation results, and the maximum impact on the support structure Positioning the force part; laying at least one foundation pit excavation response data acquisition device on the foundation pit wall; setting a data collection and transmission device. The layout method of the foundation pit excavation monitoring system provided by the present invention is based on the generalized model of the engineering geology of the foundation pit site and the analysis and calculation model of the excavation response of the foundation pit engineering, and determines the setting of the foundation pit excavation response data acquisition device according to the simulation simulation results Points can accurately locate dangerous points, improving the accuracy of system data collection and analysis.

Description

Layout method of foundation pit excavation monitoring system and foundation pit excavation monitoring system

technical field

The invention belongs to the technical field of civil engineering, and in particular relates to an arrangement method of a foundation pit excavation monitoring system and a foundation pit excavation monitoring system.

Background technique

The foundation pit is an earth pit excavated at the foundation design position according to the base level and foundation plane size. Before excavation, the excavation plan should be determined according to the geological and hydrological data, combined with the conditions of the buildings near the site, and the waterproof and drainage work should be done well.

In order to monitor the response of deep foundation pit excavation and control the risks in the construction process, it is necessary to arrange various types of monitoring items in the buildings around the foundation pit, subway tunnels, etc., mainly including the lateral deformation observation of the pit wall, foundation pit Support internal force monitoring, surrounding soil settlement observation, building and tunnel deformation observation, etc.

The existing excavation response monitoring of foundation pit engineering mostly determines the monitoring points based on the actual operation experience of the construction personnel. There is often a large deviation between the monitoring points obtained in this way and the dangerous points or key points of the actual project, making it impossible for the system to collect Critical data reduces the accuracy of system analysis.

Contents of the invention

The purpose of the embodiment of the present invention is to provide a layout method of the foundation pit excavation monitoring system, aiming at solving the problem that the existing foundation pit engineering excavation response monitoring mostly determines the monitoring points according to the actual operation experience of the construction personnel. There is often a large deviation between the monitoring point and the dangerous point or key point of the actual project, which makes the system unable to collect key data and reduces the accuracy of system analysis.

The embodiment of the present invention is achieved in this way, a method for arranging a foundation pit excavation monitoring system, the method includes the following steps:

Establish a generalized engineering geological model of the foundation pit site based on engineering geology, hydrogeological survey data and foundation pit excavation design data;

Establishing a foundation pit engineering excavation response analysis and calculation model according to the foundation pit support structure data and the engineering geological generalization model of the foundation pit site;

According to the analysis and calculation model of the excavation response of the foundation pit engineering and the physical and mechanical parameters of the rock and soil mass of the foundation pit, the hydraulic parameters and the physical and mechanical parameters of the support structure, the excavation response of the foundation pit is simulated;

According to the simulation results, the scope of influence of the excavation deformation environment is divided, and the maximum force-bearing part of the support structure is positioned;

According to the division result of the scope of influence of the excavation deformation environment and the positioning result of the maximum stressed part of the support structure, at least one foundation pit excavation response data acquisition device is arranged on the wall of the foundation pit;

A data collection and transmission device is provided, and the data collection and transmission device is connected to the foundation pit excavation response data collection device for summarizing the collected foundation pit excavation response data and sending it to the client and/or server.

Another object of the embodiments of the present invention is to provide a foundation pit excavation monitoring system, the system comprising:

At least one foundation pit excavation response data collection device, the position of the foundation pit excavation response data collection device is determined according to the method described in claim 1; and

A data collection and transmission device, the data collection and transmission device is connected to the foundation pit excavation response data acquisition device, and is used to summarize the collected foundation pit excavation response data and send it to the client and/or server;

The client and/or server communicate with the data collection and transmission device for remote monitoring of foundation pit excavation response.

The layout method of the foundation pit excavation monitoring system provided by the embodiment of the present invention is based on the analysis and calculation model of the excavation response of the foundation pit engineering, and utilizes the physical and mechanical parameters of the rock and soil body of the foundation pit, the hydraulic parameters and the parameters of the support structure. Physical and mechanical parameters, simulate the excavation response of the foundation pit to determine the maximum force-bearing part of the support structure, and set the foundation pit excavation response data acquisition device at the determined maximum force-bearing position to collect the dangerous points of the project or The response data of key points improves the accuracy of system data collection and analysis, which is conducive to ensuring construction safety.

Description of drawings

Fig. 1 is a flowchart of an arrangement method of a foundation pit excavation monitoring system provided by an embodiment of the present invention;

Fig. 2 is the generalized model of foundation pit site engineering geology provided by the embodiment of the present invention;

Fig. 3 is the schematic diagram of foundation pit supporting structure provided by the embodiment of the present invention;

Figure 4 is a schematic diagram of the short-side section of the distribution of the excavation deformation affected area;

Figure 5 is a schematic diagram of the long side section of the distribution of excavation deformation affected areas;

Figure 6 is a schematic diagram of the force of the foundation pit support structure;

Fig. 7 is the layout plan of foundation pit monitoring;

Fig. 8 is a structural diagram of an arrangement system of a foundation pit excavation monitoring system provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

It can be understood that the terms "first", "second" and the like used in the present application may be used to describe various elements herein, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first xx script could be termed a second xx script, and, similarly, a second xx script could be termed a first xx script, without departing from the scope of the present application.

Fig. 1 shows a flow chart of an arrangement method of a foundation pit excavation monitoring system provided by an embodiment of the present invention, which may specifically include steps S102 to S112.

Step S102, establishing a generalized engineering geological model of the foundation pit site according to the engineering geology, hydrogeological survey data and foundation pit excavation design data.

In the embodiment of the present invention, as shown in Figure 2, the engineering geological data include but not limited to the geological structure of the construction site, topography, physical properties of soil and rock, natural geological phenomena, natural building materials, etc.; hydrogeological survey data include but It is not limited to the distribution, origin and movement rules of underground and surface water; the design data of foundation pit excavation includes the position coordinates of the foundation pit, the dimensions of length, width and depth, etc.

In the embodiment of the present invention, the generalized model is a model established according to the generalized theory, ignoring some factors that have little influence on the result. The engineering geological generalized model of the foundation pit site is the model of the foundation pit construction site established according to the generalization theory. Its specific establishment process and tools used are well known to those skilled in the art, and will not be repeated in the embodiments of the present invention.

In the embodiment of the present invention, the generalized engineering geological model of the foundation pit site at least includes a soil layer structure model and a foundation pit excavation area represented on the soil layer structure model. The soil layer structure model shows the distribution of the soil layer in the vertical direction and the relative position and size of the excavation area, which is a necessary element of the engineering geological generalization model of the foundation pit site. In addition, depending on the specific excavation site conditions, the generalized engineering geological model of the foundation pit site may also include one or more of the building action area, subway tunnel, lake, and hill represented on the soil layer structure model, For foundation pit excavation, in addition to the geological structure of the soil layer, topographic features such as lakes and hills will also affect the response of foundation pit excavation. In addition, artificial facilities will also have a greater impact on the excavation of the foundation pit, especially when excavating in underground areas, the impact of the surrounding buildings on the foundation pit cannot be ignored.

In the embodiment of the present invention, engineering geology, hydrogeological survey data and foundation pit excavation design data are data that have been determined in the engineering design and planning stage, and their sources can be obtained from the on-site collection of the construction site and the analysis of the collected samples. , calculated by using software simulation, etc., the embodiment of the present invention does not specifically limit the specific source of each data. Since the above-mentioned various types of data are necessarily involved in the excavation project of the foundation pit, from the perspective of data sources, the use of the present invention will not increase the burden of engineering planning and design, and the safety of the project can be improved by making full use of the existing data. provide assurance.

In the embodiment of the present invention, as a specific way that can be realized, the foundation pit excavation design data can be derived from the Autocad design drawings; the engineering geological generalization model can be established using ANSYS software.

Step S104, establishing a foundation pit engineering excavation response analysis and calculation model according to the foundation pit support structure data and the generalized engineering geological model of the foundation pit site.

In the embodiment of the present invention, as shown in FIG. 3 , the foundation pit support structure includes but is not limited to structures such as internal supports, columns, support piles, waist beams, and crown beams. The embodiment of the present invention does not specifically limit the number of structures and the connection relationship between each other. The above-mentioned structures are commonly used support structures in the excavation process of foundation pits. specific layout. The foundation pit support structure data in the embodiment of the present invention includes the material, physical properties, size, position and connection mode of each support structure, and its basic requirement is to meet the needs of force analysis.

In the embodiment of the present invention, the excavation response analysis and calculation model of the foundation pit is based on the generalized model of the engineering geology of the foundation pit site, adding the foundation pit support structure, and considering the surrounding artificial facilities and natural features to excavate the foundation pit. Response effects are modeled through simulation software. By simulating the excavation response of the foundation pit through the model, the analysis results can be obtained before construction or in the early stage of construction, so as to guide the construction.

In the embodiment of the present invention, as a specific way that can be realized, the excavation response analysis calculation model of pit engineering can be established in FLAC3D software.

In step S106, the excavation response of the foundation pit is simulated according to the analysis and calculation model of the excavation response of the foundation pit, the physical and mechanical parameters of the rock and soil body, the hydraulic parameters of the foundation pit, and the physical and mechanical parameters of the support structure.

In the embodiment of the present invention, the physical and mechanical parameters and hydraulic parameters of the rock and soil mass of the foundation pit and the physical and mechanical parameters of the supporting structure have been determined in the planning and design before the excavation of the foundation pit, and they are directly Just use existing data. The embodiment of the present invention does not specifically limit the tools used for simulation.

Step S108, according to the simulation results, the scope of influence of the excavation deformation environment is divided, and the maximum stress-bearing part of the support structure is located.

In the embodiment of the present invention, the distribution of the area affected by the excavation deformation and the magnitude of the stress at each position of the supporting structure can be determined through the simulation results. As shown in Figure 4-5, the regional distribution of excavation deformation can be determined by dividing the scope of influence of excavation deformation environment. Among them, the scope of influence of excavation deformation environment can be divided into main influence area and secondary influence area according to the size of the impact As well as the no-influence area, according to the force of the support structure in the main influence area, the dangerous points and key points of the support structure can be determined, as shown in Figure 6; among them, the dangerous point mainly means that the force is close to or reaches the preset The key points mainly refer to the points that are prone to damage or have great influence on other structures. Through the positioning of these two types of points, the status of the entire project can be better monitored to ensure the safety of the construction.

Step S110, according to the division result of the range of influence of the excavation deformation environment and the location result of the maximum force-bearing part of the support structure, laying at least one foundation pit excavation response data acquisition device on the wall of the foundation pit.

In the embodiment of the present invention, the foundation pit excavation response data acquisition device is selected from one or more of foundation pit soil deformation acquisition devices, support structure force acquisition devices, groundwater level buried depth acquisition devices, and pore water pressure acquisition devices. Among them, the foundation pit soil deformation collection device can use the foundation pit wall soil inclinometer, the support structure stress collection device can use the support structure stress gauge, and the groundwater level buried depth collection device can use the foundation pit pit and The underground water level gauge in the pit and the pore water pressure acquisition device can use a pore water pressure gauge. The results after layout can be drawn in the foundation pit monitoring plan, as shown in Figure 7, which is convenient for viewing at any time.

Step S112, setting up a data collection and transmission device, the data collection and transmission device is connected to the foundation pit excavation response data collection device, and is used to collect the collected foundation pit excavation response data and send it to the client and/or server.

In the embodiment of the present invention, at or near the excavation site of the foundation pit, a data collection and transmission device can also be set up to collect the collected response data of the foundation pit excavation and send it to the client and/or server. The data collection and transmission device It is connected with the foundation pit excavation response data acquisition device through wired or wireless means, and can actively acquire or passively receive the foundation pit excavation response data collected by the foundation pit excavation response data acquisition device, and the data collection and transmission device is also connected with the client And/or the server is connected, and the aggregated data can be sent to the client and/or the server to realize the remote monitoring of the system. As an optimization method, the client and/or the server can also control each foundation pit excavation response data acquisition device through the data collection and transmission device, such as switch control and the like.

The layout method of the foundation pit excavation monitoring system provided by the embodiment of the present invention is based on the analysis and calculation model of the excavation response of the foundation pit engineering, and utilizes the physical and mechanical parameters of the rock and soil body of the foundation pit, the hydraulic parameters and the parameters of the support structure. Physical and mechanical parameters, simulate the excavation response of the foundation pit to determine the maximum force-bearing part of the support structure, and set the foundation pit excavation response data acquisition device at the determined maximum force-bearing position to collect the dangerous points of the project or The response data of key points improves the accuracy of system data collection and analysis, which is conducive to ensuring construction safety.

In one embodiment, step S202 is further included in addition to step S110.

Step S202, according to the division result of the scope of influence of the excavation deformation environment and the location result of the maximum force-bearing part of the support structure, determine the deformation of the foundation pit wall soil mass and the diameter, depth and verticality of the groundwater level observation borehole parameter.

In the embodiment of the present invention, according to the division result of the environmental influence range of the excavation deformation and the location result of the maximum stressed part of the support structure, it is also possible to determine the relationship between the soil deformation of the foundation pit wall and the groundwater level observation borehole. Aperture, depth, perpendicularity parameters. Among them, the diameter and depth of the borehole directly affect the accuracy of the collected data, and the diameter of the borehole is required to match the excavation response data acquisition device of the foundation pit; the depth will also have an impact on the excavation response data acquisition device of the foundation pit, For example, when the drilling depth is too small, the foundation pit excavation response data acquisition device is too close to the foundation pit wall, which is easily affected by the unstable factors of the foundation pit wall, while when the depth is large, the foundation pit excavation response data acquisition device The wall deformation data cannot be obtained well; in addition, the verticality of the borehole will also affect the installation of the excavation response data acquisition device of the foundation pit, and some instruments require vertical installation.

The layout method of the foundation pit excavation monitoring system provided by the embodiment of the present invention can not only locate the dangerous points and key points of the project, but also quantitatively give references to the amount of deformation and stress. Using these data, it is possible to determine The size of the installation borehole of the foundation pit excavation response data collection device, because whether the installation borehole matches the foundation pit excavation response data collection device will directly affect the accuracy of data collection, so the present invention can Improve the accuracy of data collection.

In one embodiment, step S302 is further included in addition to step S110.

Step S202, according to the division result of the scope of influence of the excavation deformation environment and the location result of the maximum force-bearing part of the support structure, determine the acquisition device for the deformation of the foundation pit soil, the force acquisition device for the support structure, and the groundwater level The range, resolution and accuracy of buried depth acquisition devices and pore water pressure acquisition devices.

In the embodiment of the present invention, according to the division result of the scope of influence of the excavation deformation environment and the location result of the maximum force-bearing part of the support structure, the maximum deformation and stress of the support structure or foundation pit soil can be determined range, so that the range, resolution and accuracy of the foundation pit soil deformation acquisition device, support structure force acquisition device, groundwater depth acquisition device, and pore water pressure acquisition device can be determined, so that the foundation pit excavation response data acquisition The device fits the range of deformation or stress, which can improve the accuracy of data collection and prevent data errors caused by inappropriate range, resolution and accuracy.

The layout method of the foundation pit excavation monitoring system provided by the embodiment of the present invention can not only locate the dangerous points and key points of the project, but also quantitatively give references to the amount of deformation and stress. Using these data, it is possible to determine The range, resolution and accuracy of the foundation pit excavation response data acquisition device, because the range, resolution and accuracy of the foundation pit excavation response data acquisition device directly affect whether the collected data is accurate, so the present invention provides a basic The reference of the range, resolution and accuracy of the pit excavation response data acquisition device can improve the accuracy of data acquisition.

Fig. 8 shows that the embodiment of the present invention also provides a foundation pit excavation monitoring system, the system includes:

At least one foundation pit excavation response data collection device, the position of the foundation pit excavation response data collection device is determined according to the method described in claim 1; and

A data collection and transmission device, the data collection and transmission device is connected to the foundation pit excavation response data acquisition device, and is used to summarize the collected foundation pit excavation response data and send it to the client and/or server;

The client and/or server communicate with the data collection and transmission device for remote monitoring of foundation pit excavation response.

In the embodiment of the present invention, the installation position, borehole size, range, resolution and accuracy of the foundation pit excavation response data acquisition device can be determined according to the layout method of the foundation pit excavation monitoring system provided in the embodiment of the present invention. This part For the content, please refer to the previous description, and will not go into details here.

In the embodiment of the present invention, the data collection and transmission device is connected to each foundation pit excavation response data collection device through wires or wirelessly, and collects the collected data before sending them to the client or server. It can be understood that, in addition to the functions of data collection and communication with the client or server, the data collection and transmission device may also have the function of preliminary data processing, which is not specifically limited in the embodiment of the present invention.

In the embodiment of the present invention, multiple clients or servers can be set, and the collected field data can be processed respectively through multiple clients or servers, so as to achieve the function of monitoring the distance of the construction site.

The embodiment of the present invention provides a foundation pit excavation monitoring system, which determines the setting position of the foundation pit excavation response data acquisition device, the drilling size, range, resolution and accuracy for installation by simulating the construction site , so that the accuracy of data collection can be improved; in addition, a data collection and transmission device connected to the client or server is set up, which can summarize the data collected by each foundation pit excavation response data collection device and send it to the client or server , so as to realize the remote monitoring of the construction site, which is conducive to ensuring the safety of the construction.

It should be understood that although the various steps in the flow charts of the embodiments of the present invention are shown sequentially according to the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in each embodiment may include multiple sub-steps or multiple stages, these sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, the sub-steps or stages The order of execution is not necessarily performed sequentially, but may be performed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (8)

1. a kind of method for arranging of excavation of foundation pit monitoring system, which is characterized in that the described method comprises the following steps:

Foundation pit sitework geological generalization mould is established according to engineering geology, Hydrogeologic Survey data and excavation of foundation pit design data Type；

Base pit engineering, which is established, according to foundation pit supporting construction data and the foundation pit sitework geological generality model excavates response Analysis and calculation model；

Rock And Soil physical and mechanical parameter, the hydraulics ginseng of response analysis computation model and foundation pit are excavated according to the base pit engineering Several and the supporting construction physical and mechanical parameter, responds excavation of foundation pit and carries out analogue simulation；

It is divided, to Deformational Environment coverage is excavated to supporting construction maximum weighted position according to simulation results It is positioned；

According to the positioning at the division result of the excavation deformation environmental influence range and supporting construction maximum weighted position As a result, laying at least one excavation of foundation pit response data acquisition device in the foundation pit crater wall；

Tidal data recovering transmitting device is set, and the tidal data recovering transmitting device and the excavation of foundation pit response data acquisition device connect It connects, for summarizing collected excavation of foundation pit response data and being sent to client and/or server.

2. a kind of method for arranging of excavation of foundation pit monitoring system according to claim 1, which is characterized in that the foundation pit field Ground engineering geology form general model includes soil layer construction model and the excavation of foundation pit area that represents on the soil layer construction model.

3. a kind of method for arranging of excavation of foundation pit monitoring system according to claim 2, which is characterized in that the foundation pit field Ground engineering geology form general model further include the building zone of action represented on the soil layer construction model, subway tunnel, One of lake, massif are a variety of.

4. a kind of method for arranging of excavation of foundation pit monitoring system according to claim 1, which is characterized in that the foundation pit branch Protection structure includes inner support, column, support pile, waist rail, crown beam.

5. a kind of method for arranging of excavation of foundation pit monitoring system according to claim 1, which is characterized in that the foundation pit is opened It digs response data acquisition device and is selected from soil mass of foundation pit deformation acquisition device, supporting construction by force acquisition device, groundwater level depth One of acquisition device, pore water pressure force acquisition device are a variety of.

6. a kind of method for arranging of excavation of foundation pit monitoring system according to claim 5, which is characterized in that described according to institute The division result of excavation deformation environmental influence range and the positioning result at supporting construction maximum weighted position are stated, described Foundation pit crater wall lays at least one excavation of foundation pit response data acquisition device, furthermore further include:

According to the positioning at the division result of the excavation deformation environmental influence range and supporting construction maximum weighted position As a result, determining the aperture of foundation pit crater wall soil deformation and observation of groundwater levels drilling, depth, verticality parameter.

7. a kind of method for arranging of excavation of foundation pit monitoring system according to claim 1, which is characterized in that described according to institute The division result of excavation deformation environmental influence range and the positioning result at supporting construction maximum weighted position are stated, described Foundation pit crater wall lays at least one excavation of foundation pit response data acquisition device, furthermore further include:

According to the positioning at the division result of the excavation deformation environmental influence range and supporting construction maximum weighted position As a result, determine soil mass of foundation pit deformation acquisition device, supporting construction by force acquisition device, groundwater level depth acquisition device, Range, resolution ratio and the precision of pore water pressure force acquisition device.

8. a kind of excavation of foundation pit monitors system, which is characterized in that the system comprises:

At least one excavation of foundation pit response data acquisition device, the position of the excavation of foundation pit response data acquisition device is according to power Benefit require 1 described in method determine；And

Tidal data recovering transmitting device, the tidal data recovering transmitting device are connect with the excavation of foundation pit response data acquisition device, For summarizing collected excavation of foundation pit response data and being sent to client and/or server；

The client and/or server are communicated with the tidal data recovering transmitting device, the long-range prison for excavation of foundation pit response Control.