Device for monitoring lateral displacement of soil in situ and using method of device

Abstract

The invention relates to a device for monitoring lateral displacement of soil in situ and a using method of the device, and belongs to the field of geotechnical engineering. The device for monitoringthe lateral displacement of soil in situ comprises a static penetration machine, a sleeve, a steel strip adhered with a fiber grating and a probe, wherein the probe is pressed and contacted at the bottom end of the sleeve, the probe is fixedly connected with the steel belt, and the static penetration machine drives the sleeve to move into a soil body through a built-in driving part, so as to enable the probe and the steel belt to be pressed into the soil to a predetermined depth; the sleeve is pulled out by the static penetration machine, the steel belt adhered with the fiber grating remainingin the soil body deforms together with the soil body, and the fiber grating measures and outputs the deformation amount, so that the purpose of monitoring the lateral displacement of the soil body isrealized. The fiber grating in the device has small volume, plastic geometric shape and strong electromagnetic interference resistance; with the deformation of soil, the steel strip can be automatically monitored in real time and warned in time; the static penetration machine does not need pre-drilling, the equipment is simple and the operation is convenient; and meanwhile, the device has the advantages that the precision is high and manual measurement errors can be avoided.

Description

technical field [0001] The invention relates to an in-situ monitoring device for soil lateral displacement and a method for using it, belonging to the field of geotechnical engineering. Background technique [0002] With the rapid development of urban underground space in our country, more and more deep and large foundation pits are used in the process of urban construction. If the monitoring of the lateral displacement of the soil is not timely and accurate, it will have a serious impact on the safety of the support design and subsequent construction. At the same time, it may also cause risk events such as wall cracking, tilting and collapse of existing buildings built on soft soil foundations. Therefore, it is particularly important to accurately and real-time monitor the lateral displacement of the surrounding soil during the excavation of the foundation pit. [0003] Currently, the inclinometer is routinely used to monitor soil displacement. There are two sets of guid...

AI Technical Summary

Problems solved by technology

However, the use of an inclinometer requires pre-drilling, cumbersome procedures, and cannot achieve real-time and automatic monitoring. It mainly relies on manual measurement readings, which may cause deviations in results due to the experience of the surveyors and improper operations, and the inclinometer is expensive.

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