Method for detecting seepage passage hidden trouble of waterproof curtain

A technology of a water-stop curtain and a detection method, which is applied in the field of geophysical detection and can solve the problems of complex hydrogeological conditions, rarely used on construction sites, and complex construction detection.

Active Publication Date: 2010-02-03
JIANGSU EAST CHINA GEOLOGICAL CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before the excavation of the foundation pit, the better detection method recognized at home and abroad is to conduct a pumping test on the foundation pit inside the curtain to determine the location of the hidden danger of leakage, but this method is complicated in construction and detection, and is rarely used in construction sites
Due to the complex hydrogeological c

Method used

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  • Method for detecting seepage passage hidden trouble of waterproof curtain
  • Method for detecting seepage passage hidden trouble of waterproof curtain
  • Method for detecting seepage passage hidden trouble of waterproof curtain

Examples

Experimental program
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Embodiment

[0029] Example: Simulation test results of water-stop curtain tank

[0030] Simulated tank size: length 5m, width 4.2m, depth 2.4m. A water-stop curtain with a four-sided structure is simulated with a bottomless concrete trough with nylon reinforcement. Curtain size: 2cm thick, 1.0m high, 1.5m side length; the leakage point is located in the center of one curtain, which is a horizontal hole of 2cm×2cm.

[0031] The simulated water-stop curtain vertically enters the water at a depth of 1.0m; the power supply electrode A is located in the center of the curtain, and the B electrode is located 3m from the edge of the tank. The distance between MNs is 10cm, the x direction is vertically downward, and the origin corresponds to the position of the leakage point.

[0032] The measuring instrument is DDC-6 electronic automatic compensation instrument produced by Chongqing Geological Instrument Factory.

[0033] Measurement steps:

[0034] (1) The vertical measurement hole is on the...

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Abstract

The invention relates to a method for detecting seepage passage hidden trouble of a waterproof curtain, comprising the following steps: vertically embedding a power supply electrode A in the central of a non-excavated foundation pit of a curtain, installing a power supply electrode B at the periphery of the foundation pit, wherein the power supply electrode B is driven underground; vertically drilling a probe hole outside of the curtain, placing a determination electrode M and a determination electrode N with fixed electrode distance, and connecting the determination electrodes M and N to an input of an electronic automatic compensator by lead, wherein the determination record point is the midpoint of the distance between M and N and the depth is x; determining natural potential differenceof delta V0(x) between the electrode M and the electrode N at the depth point x by the electronic automatic compensator; facilitating the reading of the determined potential difference of delta V0(x)to be zero by the natural potential compensation of the electronic automatic compensator; providing a current I to the electrodes A and B, and determining a potential difference of V1(x) at the two electrodes of M and N at the depth point x by the electronic automatic compensator and normalizing V1(x) by I; drawing the curves of delta V0(x) and V1(x)/I changed with the depth x on a depth coordinate graph; and if a plus-minus/minus-plus transition phenomenon appears on the curve of V1(x)/I, the zero value point between the plus value and the minus value corresponds to the existing position anddepth of the hidden trouble of the seepage.

Description

technical field [0001] The invention relates to a geophysical detection method, in particular to a detection method for locating hidden dangers in leakage channels of water-stop curtains. Background technique [0002] As the price of land becomes more and more expensive, making full use of underground space has become a trend in the development of urban buildings. The excavation and support of deep foundation pits are widely used in high-rise buildings and subway projects. Due to the constraints of construction equipment, surrounding environment, geology and hydrology, etc., water-stop curtains often cannot achieve complete lap joints. Therefore, it is difficult to fundamentally change the current situation of "ten pits and nine leaks" in foundation pits in sandy soil areas. During the excavation of foundation pits, leakage dangers often occur. If the quality of the water-stop curtain can be detected before the foundation pit is excavated after the water-stop curtain is for...

Claims

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Application Information

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IPC IPC(8): G01V3/02
CPCY02A90/30
Inventor 谢兴楠程知言邹宝祥朱德兵蒋齐云卢明车平周建华
Owner JIANGSU EAST CHINA GEOLOGICAL CONSTR GROUP
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