A device and method for monitoring subsidence of soil layers

Abstract

The invention discloses a soil layered settlement monitoring device and method. The device includes a plurality of settlement monitoring mechanisms, the settlement monitoring mechanism includes an anchor mechanism, a displacement sensor and a displacement transmission rod, and the anchor mechanism includes a sleeve, a piston and a compression spring reset Mechanism, as well as anchoring parts, the lower end of the sleeve is provided with a sealing cover and a bottom cover, the upper end of the sleeve is provided with a top cover, the bottom cover is provided with a hydraulic pipe part that provides hydraulic oil for the piston, and a hydraulic pump is provided outside the top of the buried hole The method comprises the following steps: 1. Drilling of buried holes; 2. Temporary assembly of the settlement monitoring mechanism on the ground; 3. Hanging of the settlement monitoring mechanism and installation of displacement sensors; 5. Backfilling of buried holes; 6. Acquisition of layered settlement monitoring data. The invention has reasonable design, realizes settlement deformation monitoring at different depths of the soil body, has high monitoring precision and high degree of automation.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering monitoring, and in particular relates to a device and method for monitoring layered settlement of soil. Background technique [0002] In high-fill foundations, high-fill roadbeds, earth-rock dams and other projects, it is often necessary to monitor the sub-layer settlement of the soil body, and to master the settlement of different depths and different periods of the soil layer, which can be used to predict the settlement trend after the completion of the project and judge the project. stable state. At present, the monitoring of soil stratified settlement mainly adopts the deep punctuation level method and the electromagnetic settlement method. External casing protection is used to lead the measuring rod out of the ground, and then artificial leveling and elevation measurement method is used for observation. Often, only one deep punctuation point can be arranged in a borehole, which is onl...

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Problems solved by technology

At present, the subsidence monitoring of soil layers mainly adopts the deep punctuation level method and the electromagnetic settlement method. Casing protection is used outside to lead the measuring rod out of the ground, and then the leveling elevation measurement method is used for manual observation. Usually, only one deep mark point can be arranged in one borehole, which is only applicable to the situation where there are few measuring points. The measurement process is greatly affected by weather conditions. When the distance between the monitoring point and the reference point is far away, long-distance measurement is required, and the measurement process is time-consuming and laborious; the electromagnetic settlement method is to bury the settlement tube vertically in the soil, and measure the distance in layers in the axial direction of the settlement tube Set up the subsidence magnetic ring, the outside of the subsidence magnetic ring has reed claws extending into the hole wall soil, the subsidence magnetic ring settles with the hole wall soil, and the initial position and post-settlement position of the magnetic ring are measured by the electromagnetic probe, and the two are compared The layered settlement of the soil layer can be calculated, but due to the weak anchoring force of the reed claws of the magnetic ring, it is difficult to tightly grasp the borehole wall, and the gap between the settlement tube and the settlement magnetic ring is easily filled by the soil, which will affect the settlement. The magnetic ring produces a large resistance, which often makes it difficult for the subsidence magnetic ring to settle synchronously with the soil layer, and the human error is large. The measurement process requires regular calibration of the elevation of the settlement tube nozzle, and it is impossible to observe the settlement of the soil layer in real time.

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