Device and method for lateral pressure testing of layered excavation of foundation pit and non-uniform displacement support

Abstract

The invention provides a device and method for testing lateral pressure of a support of a foundation pit during stratified excavation and non-uniform displacement. The device comprises a spliced barrier wall, loading bolts, loading corners, micro soil pressure sensors, a rubber thin film and a model box, wherein the spliced barrier wall and the loading bolts are arranged on one side wall of the model box; the spliced barrier wall is located on the inner side of the side wall and parallel to the side wall; a plurality of longitudinal reinforcing ribs and transverse reinforcing ribs are arranged on the outer side of the side wall; the spliced barrier wall is formed by splicing a plurality of equal-height wall pieces; the micro soil pressure sensors are arranged on all the wall pieces; the rubber thin film covers and is adhered to the wall pieces; one end of each of the multiple loading bolts penetrates through the side wall from the outside of the model box to splice all the wall pieces of the barrier wall; the loading bolts can be twisted. The device can simulate the lateral pressure of a support structure in a stratified excavation process of the foundation pit to provide a basis for engineering design and supporting; a distribution rule of the lateral pressure of the support structure during non-uniform displacement and a ruler that the lateral pressure changes with the displacement can be researched.

Description

technical field [0001] The invention relates to an indoor model test of geotechnical engineering, in particular to a support side pressure test device and method under the condition of layered excavation of foundation pit and non-uniform displacement. Background technique [0002] The foundation pit is gradually excavated and unloaded. The distribution law of the earth pressure on the support structure is an important content of the foundation pit engineering research, and it is also the basis for the design of the foundation pit support. The change law of the earth pressure of the support structure with the excavation process is also a important scientific issues in soil engineering. [0003] There are many studies on the earth pressure of rigid retaining walls. In actual engineering, in addition to gravity retaining walls, other supporting structures will undergo deflection and deformation during use, reflecting the characteristics of flexible retaining walls. Non-uniform...

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Problems solved by technology

[0004] Up to now, there are not many test devices for studying the unloading soil pressure of excavation at home and abroad, and the number of layers is small, and the one-time unloading depth is too large, which makes it difficult to simulate the actual working conditions; Experimental setups for earth pressure are even rarer

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