Soil body layered settlement monitoring device and method

Abstract

The invention discloses a soil body layered settlement monitoring device and a method. The device comprises a plurality of settlement monitoring mechanisms; each settlement monitoring mechanism comprises an anchoring mechanism, a displacement sensor and a displacement transmission rod; each anchoring mechanism comprises a sleeve, a piston, a compression spring reset mechanism and an anchoring part; a sealing cover and a bottom cover are arranged at the lower end of each sleeve; a top cover is arranged at the upper end of each sleeve; a hydraulic pipe component for providing hydraulic oil for the pistons is arranged on the bottom covers; and a hydraulic pump is arranged outside the top of a embedding hole. The method includes the steps of step one, drilling the embedding hole; step two, temporarily assembling the settlement monitoring mechanisms on the ground; step three, lifting the settlement monitoring mechanisms and installing the displacement sensors; step four, continuously lifting the settlement monitoring mechanisms and anchoring the anchoring mechanisms; step five, backfilling the embedding hole; and step six, acquiring layered settlement monitoring data. The soil body layered settlement monitoring device is reasonable in design, the settlement deformation monitoring of soil at different depths is achieved, the monitoring precision is high, and the automation degree ishigh.

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 soil layered settlement. Background technique [0002] In high-fill foundations, high-fill subgrades, earth-rock dams and other projects, it is often necessary to monitor the sub-layer settlement of the soil body to grasp the settlement of different depths and periods of the soil layer, which is used to predict the settlement trend after the completion of the project and judge the project stable state. 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...

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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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