Method for monitoring water level by replacing foundation pit appearance logging with layered pore pressure monitoring device
Through the layered hole pressure monitoring device, the hole pressure gauge distribution is adjusted according to the soil layer pore water pressure data, which solves the problem that multi-point hole pressure gauge on the outer periphery of the foundation pit in the existing technology is difficult to accurately monitor the soil layer pressure, and realizes the inside of the foundation pit The accurate monitoring of each soil layer and the efficient positioning of leakage risks have improved monitoring accuracy and efficiency, replacing the traditional foundation pit external observation wells.
Patent Information
- Application Number
- CN202411536952.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2024-12-13
AI Technical Summary
In the prior art, it is difficult to accurately monitor the pore water pressure pressure of soil layers with different thicknesses in the multi-point periphery of the foundation pit, resulting in the difficulty of accurately positioning of soil layers with high leakage risk, and it is difficult to achieve timely and efficient use of the prior art. , convenient leakage detection and repair.
Using a layered hole pressure monitoring device, the initial monitoring equipment is buried by presetting multiple holes on the periphery of the foundation pit, collecting pore water pressure data of each soil layer, determining the leakage risk based on the data, adjusting the distribution of the hole pressure gauge group, increasing or decreasing Hole pressure gauge accurately monitors high and low risk soil layers to improve monitoring accuracy and efficiency.
Accurate monitoring of pore water pressure in each soil layer in the foundation pit, improves the positioning accuracy and monitoring efficiency of leakage risks, can timely and dynamically monitor the groundwater level outside the foundation pit, replaces the traditional foundation pit observation wells, and improves construction and use. Safety and efficiency in the process.
Smart Images
Figure CN119122027A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of foundation pit water stopping monitoring, and in particular to a method for replacing a foundation pit external observation well with a layered pore pressure monitoring device to monitor water level. Background Art
[0002] The foundation pit is an earth pit excavated at the foundation design position according to the base elevation and foundation plane dimensions. During the construction of underground projects, a water-stop curtain is usually set up to isolate the hydraulic connection between the inside and outside of the foundation pit, to prevent groundwater recharge outside the pit from affecting the dryness of the working surface in the foundation pit, to prevent engineering disasters such as leakage and sudden surges, and at the same time to reduce surface settlement outside the foundation pit caused by precipitation in the pit.
[0003] During the construction and subsequent use, the water-stop curtain may be damaged due to quality problems, and accidents such as water leakage and sand leakage often occur. In order to reduce the impact of leakage and repair the water-stop curtain, it is necessary to timely, efficiently and conveniently detect the leakage of the water-stop curtain and locate the location and degree of leakage.
[0004] In the prior art, a multi-point monitoring method can be buried around the periphery of the foundation pit to monitor the water pressure of the soil layer near the inner wall of the foundation pit. The multi-point monitoring is to preset a plurality of preset holes that vertically pass through a plurality of soil layers on the periphery of the foundation pit, and bury monitoring equipment for monitoring pore water pressure in the plurality of preset holes, so as to realize the monitoring of the soil layer water pressure near the inner wall of the foundation pit, and facilitate timely repair of the inner wall area corresponding to the water-stop curtain according to the monitoring data of the monitoring equipment.
[0005] However, in the prior art, the burying method of multi-point piezometers still has limitations in actual use. In the prior art, a plurality of equidistantly distributed piezometers are usually installed on the monitoring equipment to realize pore water pressure monitoring of multiple soil layers and multiple points. However, according to the actual site and depth of the foundation pit construction, there will be multiple soil layers of different thicknesses on the inner wall of the foundation pit. If the piezometers are evenly installed on the monitoring equipment, it is difficult to ensure accurate monitoring of the pore water pressure of the soil layer with high leakage risk. Therefore, there is an urgent need for a technical solution for burying multiple monitoring equipment that can accurately locate the soil layer with high leakage risk in the preset hole for monitoring. Summary of the invention
[0006] The purpose of the present invention is to provide a method for monitoring water level by using a layered pore pressure monitoring device to replace an observation well outside a foundation pit, so as to solve the problems in the prior art.
[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: The method of using a layered pore pressure monitoring device to replace an observation well outside a foundation pit to monitor water level includes the following steps: S1: According to the geological survey data, the typical soil layer distribution of the foundation pit site is determined, and multiple preset holes for burying monitoring equipment are preset around the foundation pit, and the initial monitoring equipment is buried in any preset hole; S2: The data acquisition device receives the pore water pressure data of each soil layer uploaded by the monitoring device in the buried hole; S3: The data processing device determines the leakage risk of each soil layer in the preset hole according to the uploaded pore water pressure data of each soil layer, and obtains leakage risk information about each soil layer in the preset hole; S4: According to the leakage risk of each soil layer in the preset hole, the distribution of multiple groups of piezometers on the next initial monitoring device for monitoring the pore water pressure of each soil layer is adjusted to obtain an adjusted monitoring device; S5: burying the adjusted monitoring device in another preset hole adjacent to the preset hole that has been tested, and repeating steps S2-S4 until all monitoring devices are buried in the corresponding preset holes.
[0008] As a preferred solution of the present invention, in step S1, the preset hole vertically passes through all soil layers contained on the inner wall of the foundation pit, and there is a spacing between the preset hole and the inner wall of the foundation pit, and there is a spacing between any adjacent preset holes; The initial monitoring device is provided with piezometer groups corresponding to the preset number of soil layers in the hole, each piezometer group is located in the corresponding soil layer, each piezometer group has one piezometer, and one piezometer of each piezometer group is evenly distributed in the middle position of the corresponding soil layer, and the data lines of all piezometers are distributed along the monitoring device and connected to the data acquisition instrument.
[0009] As a preferred solution of the present invention, in step S2, the pore water pressure data of each soil layer includes: peak value data of the pore water pressure of each soil layer per unit time and maximum difference data of the pore water pressure of each soil layer per unit time.
[0010] As a preferred solution of the present invention, in step S3, the leakage risk information of each soil layer includes no leakage risk, low risk and high risk; The specific steps for determining the leakage risk of each soil layer in the preset hole are as follows: S31: Determine the peak value of the pore water pressure uploaded by the piezometer in the lowest soil layer in the preset hole. If the peak value data is greater than the first peak value threshold, determine that the leakage risk of the soil layer is high risk; if the peak value data is not greater than the first peak value threshold but greater than the second peak value threshold, determine that the leakage risk of the soil layer is low risk; if the peak value data is not greater than the second peak value threshold, execute the next step; S32: Determine the maximum difference data of the pore water pressure uploaded by the piezometer in the soil layer. If the maximum difference data is greater than a first pressure difference threshold, determine that the leakage risk of the soil layer is high risk; if the maximum difference data is not greater than the first pressure difference threshold but greater than a second pressure difference threshold, determine that the leakage risk of the soil layer is low risk; if the maximum difference data is not greater than the second pressure difference threshold, determine that there is no leakage risk in the soil layer; S33: Repeat steps S31-S32 for the adjacent soil layers above the soil layer for which the leakage risk determination has been completed, until the leakage risk determination of all soil layers in the preset hole is completed.
[0011] As a preferred solution of the present invention, in step S4, the specific steps of adjusting the next initial monitoring device according to the preset risk of leakage in the hole are: S41: adjusting the position of any piezometer in the piezometer group corresponding to the low-risk soil layer area on the monitoring device, and adding a new piezometer to the piezometer group; S42: adding two new piezometers to any piezometer group corresponding to the high-risk soil layer area of the monitoring equipment; S43: Repeat steps S41-S42 until all piezometer groups corresponding to low-risk soil layers and all piezometer groups corresponding to high-risk soil layers on the monitoring device are modified, and all modified piezometers are calibrated to obtain an adjusted monitoring device.
[0012] As a preferred solution of the present invention, in step S41, the thickness value of the low-risk soil layer area on the monitoring device is set to D1, and the original piezometer position is changed from Adjusted to A new piezometer was installed at Place.
[0013] As a preferred solution of the present invention, in step S42, the thickness value of the high-risk soil layer area on the monitoring device is set to D2, and the piezometers in the piezometer group are located at One of the two new piezometers added is located at Another new piezometer is located at Place.
[0014] As a preferred solution of the present invention, in step S5, after all the monitoring devices are buried, the first buried initial monitoring device can be taken out from the soil, and based on the pore water pressure data of the last adjusted monitoring device, steps S3-S4 are repeated to modify the number and distribution of pore pressure gauges in each pore pressure gauge group in the first initial monitoring device, and finally obtain the adjusted first initial monitoring device.
[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention utilizes a static pressure-type stratified pore pressure monitoring device, which can achieve the deployment of multiple pore pressure gauge groups containing various soil layers in the corresponding preset holes at a single point, so that each soil layer has a pore pressure gauge for monitoring the pore water pressure data of the corresponding soil layer, so that before the next monitoring device is buried, the number and distribution of pore pressure gauges in each pore pressure gauge group can be adjusted according to the last buried monitoring device, so that soil layers with low leakage risk and high leakage risk can be monitored more accurately, thereby improving measurement accuracy and monitoring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0017] Figure 1 The figure is an overall flow chart of the method described in the first embodiment of the present invention.
[0018] Figure 2 This is a distribution diagram of the external layered pore pressure monitoring device of the foundation pit section of the present invention.
[0019] Figure 3 It is a schematic diagram of the layered pore pressure monitoring device of the present invention. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.
[0022] Embodiment 1 Combine the following Figures 1 to 3 As shown, the embodiment of the present invention provides a method for monitoring water level by using a layered pore pressure monitoring device to replace an observation well outside a foundation pit, comprising the following steps: S1: According to the geological survey data, the typical soil layer distribution of the foundation pit site is determined, and multiple preset holes for burying monitoring equipment are preset around the foundation pit, and the initial monitoring equipment is buried in any preset hole; In step S1, the preset hole vertically passes through all soil layers contained on the inner wall of the foundation pit, and there is a distance between the preset hole and the inner wall of the foundation pit, and there is a distance between any adjacent preset holes; The initial monitoring equipment is provided with piezometer groups corresponding to the number of preset soil layers in the hole, each piezometer group is located in the corresponding soil layer, each piezometer group has one piezometer, and one piezometer of each piezometer group is evenly distributed in the middle of the corresponding soil layer, and the data lines of all piezometers are distributed along the monitoring equipment and connected to the data acquisition instrument; S2: The data acquisition device receives the pore water pressure data of each soil layer uploaded by the monitoring device in the buried hole; In step S2, the pore water pressure data of each soil layer includes: peak value data of the pore water pressure of each soil layer within a unit time and maximum difference data of the pore water pressure of each soil layer within a unit time; S3: The data processing device determines the leakage risk of each soil layer in the preset hole according to the uploaded pore water pressure data of each soil layer, and obtains leakage risk information about each soil layer in the preset hole; In step S3, the leakage risk information of each soil layer includes no leakage risk, low risk and high risk; The specific steps for determining the leakage risk of each soil layer in the preset hole are as follows: S31: Determine the peak value of the pore water pressure uploaded by the piezometer in the lowest soil layer in the preset hole. If the peak value data is greater than the first peak value threshold, determine that the leakage risk of the soil layer is high risk; if the peak value data is not greater than the first peak value threshold but greater than the second peak value threshold, determine that the leakage risk of the soil layer is low risk; if the peak value data is not greater than the second peak value threshold, execute the next step; S32: Determine the maximum difference data of the pore water pressure uploaded by the piezometer in the soil layer. If the maximum difference data is greater than a first pressure difference threshold, determine that the leakage risk of the soil layer is high risk; if the maximum difference data is not greater than the first pressure difference threshold but greater than a second pressure difference threshold, determine that the leakage risk of the soil layer is low risk; if the maximum difference data is not greater than the second pressure difference threshold, determine that there is no leakage risk in the soil layer; S33: Repeat steps S31-S32 for the adjacent soil layers above the soil layer for which the leakage risk determination has been completed, until the leakage risk determination of all soil layers in the preset hole is completed; S4: According to the leakage risk of each soil layer in the preset hole, the distribution of multiple groups of piezometers used to monitor the pore water pressure of each soil layer on the next initial monitoring device is adjusted to obtain an adjusted monitoring device; In step S4, the specific steps of adjusting the next initial monitoring device according to the preset risk of leakage in the hole are: S41: adjusting the position of any piezometer in the piezometer group corresponding to the low-risk soil layer area on the monitoring device, and adding a new piezometer to the piezometer group; In step S41, the thickness value of the low-risk soil layer area on the monitoring device is set to D1, and the original piezometer position is changed from Adjusted to A new piezometer was installed at Department; S42: adding two new piezometers to any piezometer group corresponding to the high-risk soil layer area of the initial equipment; In step S42, the thickness value of the high-risk soil layer area on the monitoring device is set to D2, and the piezometers in the piezometer group are located at One of the two new piezometers added is located at Another new piezometer is located at Department; S43: Repeat steps S41-S42 until all piezometer groups corresponding to low-risk soil layers and all piezometer groups corresponding to high-risk soil layers on the monitoring device are modified, and all modified piezometers are calibrated to obtain an adjusted monitoring device; S5: burying the adjusted monitoring device in another preset hole adjacent to the preset hole that has been tested, and repeating steps S2-S4 until all monitoring devices are buried in the corresponding preset holes.
[0023] In step S5, after all monitoring devices are buried, the first buried initial monitoring device can be taken out of the soil, and steps S3-S4 can be repeated based on the pore water pressure data of the last adjusted monitoring device, so as to modify the number and distribution of pore pressure gauges in each pore pressure gauge group in the first initial monitoring device, and finally obtain the adjusted first initial monitoring device.
[0024] In the accompanying drawings, A represents the piezometer group corresponding to the low-risk soil layer, B represents the piezometer group corresponding to the high-risk soil layer, C1 represents the piezometer originally existing on the initial monitoring equipment, C2 represents the new piezometer, and E represents the monitoring equipment. In addition, D1 and D2 appearing in this embodiment are preset according to actual construction parameters.
[0025] The present invention utilizes a static pressure-type stratified pore pressure monitoring device, which can achieve the deployment of multiple pore pressure gauge groups containing various soil layers in a corresponding preset hole at a single point, so that each soil layer has a pore pressure gauge for monitoring the pore water pressure data of the corresponding soil layer, so that before the next monitoring device is buried, the number and distribution of pore pressure gauges in each pore pressure gauge group can be adjusted according to the last buried monitoring device, so that soil layers with low leakage risk and high leakage risk can be monitored more accurately, the measurement accuracy and monitoring efficiency can be improved, and single-hole measurement of groundwater levels at multiple depths can be achieved. Automated monitoring is adopted during monitoring, which can achieve timely and dynamic monitoring of groundwater levels outside the foundation pit, replacing traditional observation wells outside the foundation pit.
[0026] Embodiment 3 This embodiment includes a computer-readable storage medium, on which a data processing program is stored. The data processing program is executed by a processor to implement a gas collection and analysis method for a gas production wellhead in embodiment 1.
[0027] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.
Claims
1. A method for monitoring water level by using a layered pore pressure monitoring device instead of an observation well outside a foundation pit, characterized in that: The steps include: S1: According to the geological survey data, the typical soil layer distribution of the foundation pit site is determined, and multiple preset holes for burying monitoring equipment are preset around the foundation pit, and the initial monitoring equipment is buried in any preset hole; S2: The data acquisition device receives the pore water pressure data of each soil layer uploaded by the monitoring device in the buried hole; S3: The data processing device determines the leakage risk of each soil layer in the preset hole according to the uploaded pore water pressure data of each soil layer, and obtains leakage risk information about each soil layer in the preset hole; S4: According to the leakage risk of each soil layer in the preset hole, the distribution of multiple groups of piezometers on the next initial monitoring device for monitoring the pore water pressure of each soil layer is adjusted to obtain an adjusted monitoring device; S5: burying the adjusted monitoring device in another preset hole adjacent to the preset hole that has been tested, and repeating steps S2-S4 until all monitoring devices are buried in the corresponding preset holes.
2. The method for monitoring water level by using the layered pore pressure monitoring device to replace the observation well outside the foundation pit according to claim 1 is characterized in that: In step S1, the preset hole vertically passes through all soil layers contained on the inner wall of the foundation pit, and there is a distance between the preset hole and the inner wall of the foundation pit, and there is a distance between any adjacent preset holes; The initial monitoring device is provided with piezometer groups corresponding to the preset number of soil layers in the hole, each piezometer group is located in the corresponding soil layer, each piezometer group has one piezometer, and one piezometer of each piezometer group is evenly distributed in the middle position of the corresponding soil layer, and the data lines of all piezometers are distributed along the monitoring device and connected to the data acquisition instrument.
3. The method for monitoring water level by using the layered pore pressure monitoring device to replace the observation well outside the foundation pit according to claim 1 is characterized in that: In step S2, the pore water pressure data of each soil layer includes: peak value data of the pore water pressure of each soil layer within a unit time and maximum difference data of the pore water pressure of each soil layer within a unit time.
4. The method for monitoring water level by using the layered pore pressure monitoring device to replace the observation well outside the foundation pit according to claim 3 is characterized in that: In step S3, the leakage risk information of each soil layer includes no leakage risk, low risk and high risk; The specific steps for determining the leakage risk of each soil layer in the preset hole are as follows: S31: Determine the peak value of the pore water pressure uploaded by the piezometer in the lowest soil layer in the preset hole. If the peak value data is greater than the first peak value threshold, determine that the leakage risk of the soil layer is high risk; if the peak value data is not greater than the first peak value threshold but greater than the second peak value threshold, determine that the leakage risk of the soil layer is low risk; if the peak value data is not greater than the second peak value threshold, execute the next step; S32: Determine the maximum difference data of the pore water pressure uploaded by the piezometer in the soil layer. If the maximum difference data is greater than a first pressure difference threshold, determine that the leakage risk of the soil layer is high risk; if the maximum difference data is not greater than the first pressure difference threshold but greater than a second pressure difference threshold, determine that the leakage risk of the soil layer is low risk; if the maximum difference data is not greater than the second pressure difference threshold, determine that there is no leakage risk in the soil layer; S33: Repeat steps S31-S32 for the adjacent soil layers above the soil layer for which the leakage risk determination has been completed, until the leakage risk determination of all soil layers in the preset hole is completed.
5. The method for monitoring water level by using the layered pore pressure monitoring device to replace the observation well outside the foundation pit according to claim 1 is characterized in that: In step S4, the specific steps of adjusting the next initial monitoring device according to the preset risk of leakage in the hole are: S41: adjusting the position of any piezometer in the piezometer group corresponding to the low-risk soil layer area on the monitoring device, and adding a new piezometer to the piezometer group; S42: adding two new piezometers to any piezometer group corresponding to the high-risk soil layer area of the monitoring equipment; S43: Repeat steps S41-S42 until all piezometer groups corresponding to low-risk soil layers and all piezometer groups corresponding to high-risk soil layers on the monitoring device are modified, and all modified piezometers are calibrated to obtain an adjusted monitoring device.
6. The method for monitoring water level by using the layered pore pressure monitoring device to replace the observation well outside the foundation pit according to claim 5 is characterized in that: In step S41, the thickness value of the low-risk soil layer area on the monitoring device is set to D1, and the original piezometer position is changed from Adjusted to A new piezometer was installed at Place.
7. The method for monitoring water level by using the layered pore pressure monitoring device to replace the observation well outside the foundation pit according to claim 5 is characterized in that: In step S42, the thickness value of the high-risk soil layer area on the monitoring device is set to D2, and the piezometers in the piezometer group are located at One of the two new piezometers added is located at Another new piezometer is located at Place.
8. The method for monitoring water level by using the layered pore pressure monitoring device to replace the observation well outside the foundation pit according to claim 1 is characterized in that: In step S5, after all monitoring devices are buried, the first buried initial monitoring device can be taken out of the soil, and based on the pore water pressure data of the last adjusted monitoring device, steps S3-S4 are repeated to modify the number and distribution of piezometers in each piezometer group in the first initial monitoring device, and finally obtain the adjusted first initial monitoring device.