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Method for monitoring springback amount of pit bottom of foundation pit

A rebound volume and foundation pit technology, which is applied in the field of foundation soil survey, infrastructure engineering, construction, etc., can solve problems such as the trouble of burying the rebound mark and observation, and the inability to achieve layered observation or automatic real-time observation. , to achieve the effect of convenient installation and burying, good economic and social benefits, and accurate observation data

Pending Publication Date: 2018-01-23
POWERCHINA HUADONG ENG COPORATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the embedment and observation of the rebound marker are very troublesome, and layered observation or automatic real-time observation cannot be achieved

Method used

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  • Method for monitoring springback amount of pit bottom of foundation pit
  • Method for monitoring springback amount of pit bottom of foundation pit
  • Method for monitoring springback amount of pit bottom of foundation pit

Examples

Experimental program
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Effect test

Embodiment Construction

[0015] Taking the foundation pit with support structure as an example, the specific implementation is as follows:

[0016] (1) On the original ground 5, use a drilling rig to lay the sensor optical cable 1 and install the borehole 3 to the non-resilient rock and soil layer. The diameter of drilling 3 can be selected from 76mm to 108mm.

[0017] (2) Install the protective pipe 4 in the soil layer 7 at the borehole opening, and bury the protective pipe 4 in the soil layer 9 10-20mm below the foundation pit surface 8, and the diameter of the protective pipe 4 can be 108mm-130mm.

[0018] (3) Place the sensing optical cable 1 in the borehole 3, and fill the borehole 3 with bentonite balls 2.

[0019] (4) The sensing optical cable 1 is connected to the optical fiber sensing induction deformation demodulator 10 . The sensing cable 1 is a quasi-distributed fiber grating string or a distributed sensing fiber; the sensing cable strain demodulator 10 is a fiber grating demodulator or ...

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Abstract

The invention provides a method for monitoring the springback amount of the pit bottom of a foundation pit. Before the foundation pit is excavated, a device for monitoring the springback amount of thepit bottom of the foundation pit is formed through the steps that a drill hole is drilled; a protecting pipe is embedded; a sensing optical cable is mounted; the drill hole is filled with bentonite;and the sensing optical cable and a sensing optical cable strain demodulation instrument are connected. Strain values of the sensing optical cable at testing points of all the depths within the drilling depth range under the bottom face of the foundation pit are tested; in the foundation pit excavating process or after foundation pit excavating, the strain values of the sensing optical cable at the testing points of all the depths within the drilling depth range under the bottom face of the foundation pit are tested again; the epsilon <j, i>-hi relation curve and the delta S<j, i>-hi relationcurve are drawn, and accordingly the springback amount and distribution of the springback amount of the testing points of each soil layer under the bottom of the foundation pit are obtained. The magnitude and distribution of the springback amount of each soil layer under the bottom of the foundation pit can be automatically observed, the strain change of each testing point is accurately tested, and the springback amount of each testing point is calculated. The method has the advantages that the principle is simple, mounting and embedding are convenient, automatic observing can be achieved, theobserved data are accurate, and good economic and social benefits are achieved.

Description

technical field [0001] The invention relates to a device and method for monitoring the springback amount of the bottom of a foundation pit. Applicable to the technical field of geotechnical engineering. Background technique [0002] The rebound amount of the foundation pit is the amount of rebound within the influence range inside and outside the foundation pit due to the removal of the self-weight of the foundation pit after the excavation of the foundation pit relative to that before the excavation, also known as the uplift amount of the foundation pit bottom. Monitoring the size and distribution of the springback of each soil layer under the foundation pit is of great significance for guiding construction and optimizing design. At present, the springback of the foundation pit is generally carried out by arranging and burying the springback marker. The springback mark should be buried 20-30cm below the bottom of the foundation pit. According to the excavation depth and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D1/02E02D1/08
Inventor 陈文华王群敏黄江华王烨晟张文成郭剑锋
Owner POWERCHINA HUADONG ENG COPORATION LTD
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