Underground structure construction-oriented soil performance monitoring device and working method thereof

Abstract

The invention discloses an underground structure construction-oriented soil performance monitoring device and a working method thereof. Corresponding laser transmitters and receivers are arranged on the outer walls of circuit protection boxes and the inner walls of soil pressure contact plates, and circuits in each circuit protection box are connected in parallel and turned on after two metal conductive rods are conductive in water. Disturbance of soil is reflected by monitoring the displacement of the soil pressure contact plates via a laser ranging technology, and accurate measurement on multi-directional deformation of soil is realized; meanwhile, the pressure change value of the soil in each direction is calculated via the displacement measured by laser ranging with the use of Hooke's law; besides, the change of underground water level can be displayed via the change of main circuit trunk current by using the Ohm's law; multi-depth and multi-directional automation degree test on the soil is realized, the monitoring data is reliable, the safety of underground structure construction and surrounding buildings is ensured, and the device has broad engineering application prospect and will produce remarkable social and economical benefits.

Description

technical field [0001] The invention relates to the field of underground structures in civil engineering, in particular to a soil monitoring device and a working method thereof. Background technique [0002] In recent years, the monitoring of underground soil has become an important means and research hotspot for the quality and safety evaluation of geotechnical engineering projects and the prediction of geological disasters. It can go deep into the interior of rock and soil for dynamic monitoring of geological parameters such as horizontal displacement, settlement, stress, and water level at different depths underground. Therefore, it can accurately detect underground displacement and deformation information, determine the deformation range, and then study the deformation mechanism, disaster status, and development trend. and disaster forecasting. However, the invisibility and complexity of monitoring lead to the slow development of underground monitoring technology, which...

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Problems solved by technology

Secondly, the earth pressure cell is buried in the soil, which cannot realize multi-depth measurement at the measuring point. If you want to test the earth pressure at different depths, you need to bury more than one, and the price is relatively expensive.

(2) The soil inclinometer also has several common problems in the process of measuring the horizontal displacement of the soil. The torsion of the guide groove of the aluminum alloy inclinometer tube is small, while the torsion problem of the plastic inclinometer tube is more serious; the inclinometer tube reaches the limit After deformation, the horizontal displacement below the limit bending part cannot be further measured; the two ends of the inclinometer tube are relatively fixed, and the stiffness of the inclinometer tube is much greater than that of the saturated soft soil, resulting in the uncoordinated deformation of the soft soil and the inclinometer tube

When a large amount of precipitation comes, it is easy to flow directly from the mouth of the inclinometer pipe, resulting in a sharp change in the water level in the pipe, and the communication between the inclinometer pipe and the groundwater level is not smooth, so the measured groundwater level is not real-time and cannot be timely Reflect changes in groundwater levels

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