Model test device for soil reinforcement at bottom of rectangular foundation pit in soft soil area and test method

Abstract

The invention discloses a model test device for soil reinforcement at the bottom of a rectangular foundation pit in a soft soil area and a test method. The device comprises a model box, a retaining pile model, a crown beam model, an inner supporting model, a soil stress measuring device, a pile strain measuring device, a foundation pit displacement measuring device and tested soil. The model box is composed of steel plates and polymethyl methacrylate. The retaining pile model and the inner supporting model are made of PVC round pipes and PVC square pipes, and the crown beam model is made of wood. The soil stress measuring device is composed of miniature resistance soil pressure boxes. The pile strain measuring device is composed of strain gauges. By the adoption of the model test device and the test method, the process of the rectangular foundation pit extraction in the soft soil area after the pit bottom soil reinforcement can be simulated, the blank of the foundation pit bottom soilreinforcement model test research can be filled, effective experimental data support can be provided for the research on the influence of the foundation pit excavation on the foundation pit excavationand the surrounding area after the foundation pit bottom soil reinforcement, and reference can be provided for the design and construction of the foundation pit engineering.

Description

technical field [0001] The invention relates to a soil reinforcement model test device and test method at the bottom of a rectangular foundation pit in a soft soil area, in particular to a model test device and a test method for foundation pit excavation simulation under different soil reinforcement forms at the bottom of a foundation pit, which can be used for Measure foundation pit soil pressure and foundation pit deformation under different foundation pit excavation conditions. Background technique [0002] There are many factors involved in foundation pit deformation, such as soil properties, excavation methods, groundwater conditions, surrounding environment, etc. The control of foundation pit deformation is usually considered from two aspects of design and construction. In the design, choosing a suitable maintenance structure, a reasonable support structure system, applying prestress to the anchor rods and supports, reinforcing the soil at the bottom of the foundation ...

AI Technical Summary

Problems solved by technology

However, the numerical simulation method, the establishment of the numerical model is more complicated, the calculation is time-consuming and there will be a gap with the actual situation.

The on-site monitoring method is time-consuming, labor-intensive, and expensive, and mechanical construction has a great impact on monitoring

At present, no one has conducted research on the model test of soil reinforcement at the bottom of the foundation pit.

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