Pull rod type testing device and method for unsaturated undisturbed loess slope soil pressure

Abstract

The invention relates to a pull rod type testing device and method for unsaturated undisturbed loess slope soil pressure, wherein the device and method are used for testing the soil pressure and the change rule of an unsaturated undisturbed loess vertical slope. The pull rod type testing device for the unsaturated undisturbed loess slope soil pressure comprises an anchor rod, a rebar stress detector, an anchor plate and a data collection box, wherein the two ends of the rebar stress detector are welded to the anchor rod; one end of the anchor rod is fixedly connected with the anchor plate; the other end of the anchor rod is anchored to an anchor pile; the rebar stress detector is connected with the data collection box through a data line. A casing pipe is arranged on the periphery of the anchor rod and the rebar stress detector. When the pull rod type testing device is used, a concrete pile serves as the anchor pile at one end of the anchor rod, the other end of the anchor rod is anchored to the free face of the slope, the loess slope is vertically cut from top to bottom, the tested natural undisturbed loess slope is cut to be a vertical slope, in the process of cutting the slope, due to large unloading on the undisturbed slope, the soil stress is released to produce acting force on the anchor plate, the anchor rod and the rebar stress detector are made to produce strain, and then the soil pressure at the tested point can be tested; the intensity of the soil pressure on the anchor plate can also be tested.

Description

technical field [0001] The invention belongs to a method for actually measuring side slope soil pressure in the field of geotechnical engineering, and is mainly used for testing the magnitude and change rule of the soil pressure of the unsaturated undisturbed loess vertical slope, specifically the invention relates to the unsaturated undisturbed loess slope earth pressure The rod-type testing device, the present invention also relates to a method for using the rod-type testing device to test the soil pressure of the unsaturated undisturbed loess slope. Background technique [0002] Earth pressure is the result of the interaction between the soil and the supporting structure. According to the direction and size of the displacement of the retaining structure, the traditional design theory only considers the earth pressure in three limit states, namely active, passive and static earth pressure. The classic earth pressure theory of Coulomb (1773) and Rankine (1857) is widely ...

AI Technical Summary

Problems solved by technology

[0007] It is difficult to accurately measure the real earth pressure of the excavated soil by using rigid retaining structures and earth pressure boxes in the earth pressure test

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