Dynamic monitoring system and monitoring method of deep foundation pit confined water drawdown

A technology of dynamic monitoring and pressurized water, which is applied in basic structure engineering, basic structure test, construction, etc., can solve the problems affecting the accuracy of measurement and reading data, easy bending and deformation, etc., and achieves wide application range, reduced workload and The effect of error and easy operation

Active Publication Date: 2015-08-12
宁波用信建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Dynamic monitoring system and monitoring method of deep foundation pit confined water drawdown
  • Dynamic monitoring system and monitoring method of deep foundation pit confined water drawdown
  • Dynamic monitoring system and monitoring method of deep foundation pit confined water drawdown

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A deep foundation pit pressurized water precipitation dynamic monitoring system, such as figure 1 As shown, including the monitoring well 10, the monitoring well 10 is provided with a dewatering well pipe 1, the bottom of the dewatering well pipe 1 is provided with a filter pipe 6 in the region of the confined water layer 11 to be measured, and the bottom of the filter pipe 6 is provided with a The sedimentation pipe 7 for sand and soil, the bottom of the sedimentation pipe 7 is sealed, the sealing clay 2 is filled between the upper part of the downwater well pipe 1 and the hole wall of the monitoring well 10, the lower part of the downwater well pipe 1 and the hole wall of the monitoring well 10 Water-stop clay 4 is filled in between, gravel filter material 5 is filled between the filter pipe 6 and the hole wall of the monitoring well 10 and between the sedimentation pipe 7 and the hole wall of the monitoring well 10, and the inner wall of the dewatering well pipe 1 is ...

Embodiment 2

[0041] A method for dynamic monitoring of confined water precipitation in deep foundation pits, specifically comprising the following steps:

[0042] (1) Setup of dynamic monitoring system for confined water precipitation

[0043] Install several pore pressure sensors 3 at equal intervals longitudinally on the inner wall of the dewatering well pipe 1, connect the bottom of the dewatering well pipe 1 to the filter pipe 6 and the sedimentation pipe 7 in sequence, and seal the bottom of the sedimentation pipe 7; In the monitoring well 10, a sedimentation pipe 7, a filter pipe 6 and a downwater well pipe 1 are set up in the monitoring well 10 from bottom to top, and the sedimentation pipe 7 and the filtration pipe 6 are arranged in the area of ​​the confined water layer 11 to be tested, Backfill gravel filter material 5 between the hole wall of the monitoring well 10 and the sedimentation pipe 7 and between the hole wall of the monitoring well 10 and the filter pipe 6, and backfil...

Embodiment 3

[0065] Ningbo Rail Transit City Government Station is located on the northeast side of the intersection of Zhongshan East Road and Jiefang North Road. It is now the municipal green space of Sunshine Square. The foundation pit of Line 1 station is 20.5-24.8m wide and 168.6m long. The depth of the foundation pit of Xiduantou well is 25.3m; the depth of foundation pit of the standard section is about 23.8m. The phreatic static water level is high (only 5.0m from the surface), and the confined water in the first layer of pores occurs in ⑥ 5 and ⑧ 1 In the silt, fine sand, coarse sand, gravel and round gravel layers, the water permeability is good, the average permeability coefficient is about 30.5m / d, the confined water head is 1.8m, and the water volume is abundant. According to the engineering geological and hydrogeological conditions provided by the survey data, the possibility of foundation pit inrush is calculated, and the water inflow of the foundation pit is calculated ac...

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Abstract

The invention discloses a dynamic monitoring system and a monitoring method of deep foundation pit confined water drawdown. The dynamic monitoring system comprises a monitoring well and is characterized in that a drawdown well pipe is arranged in the monitoring well; the bottom of the drawdown well pipe is provided with a filter pipe in a confined water layer area to be tested; the bottom of the filter pipe is provided with a precipitation pipe; the bottom of the precipitation pipe is sealed; a gap between the upper part of the drawdown well pipe and the hole wall of the monitoring well is filled with hole sealing clay; the gap between the lower part of the drawdown well pipe and the hole wall of the monitoring well is filled with waterstop clay; the gap between the filter pipe and the hole wall of the monitoring well as well as the gap between the precipitation pipe and the hole wall of the monitoring well is filled with gravel filter materials; the inner wall of the drawdown well pipe is longitudinally uniformly provided with a plurality of hole pressure sensors; each hole pressure sensor is respectively connected with a data acquisition instrument via a lead; the data acquisition instrument is connected with a monitoring computer; the filter pipe is communicated with an external water suction pump via a water suction pipe. The dynamic monitoring system has the advantages that confined water level drawdown can be dynamically, precisely and reliably measured, foundation pit confined water drawdown can be judged in real time, and time for a pumping well to stop working is determined.

Description

technical field [0001] The invention relates to a dynamic monitoring technology for foundation pit engineering precipitation, in particular to a dynamic monitoring system and monitoring method for deep foundation pit pressurized water precipitation. Background technique [0002] In recent years, foundation pit engineering has developed to a large depth and large area, and the groundwater problem it faces has become more and more serious. Especially, the pressurized water in the lower part of the excavation surface of the foundation pit will cause problems such as pit bottom uplift and floor surge, which will lead to foundation Pit instability, the control of confined water has become the key to the smooth progress of the entire foundation pit project. The basis for judging the stability of a foundation pit is that the earth pressure between the bottom of the foundation pit and the roof of the confined aquifer should be greater than the jacking force of the confined water, na...

Claims

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Application Information

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IPC IPC(8): E02D33/00E02D19/10
Inventor 刘干斌黄勇陈斌陆海冰
Owner 宁波用信建设有限公司
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