Test device and test method for compressive deformation modulus and strength of soil in deep hole

Abstract

The invention relates to a testing device and a testing method for compressive deformation modulus and strength of soil in a deep hole. The most direct and reliable way to evaluate the state of engineering foundations is the load plate test, but there is currently no device for the load plate test in the hole. In the present invention, the hydraulic rubber film is placed outside the support ring, and the support ring is placed on the support plate outside the lower core tube, then the jack and the pressure sensor are connected to the top of the lower core tube, and the displacement sensor is fixed on the support ring; the air pressure rubber The membrane is set outside the upper core tube, and then the upper and lower covers are fixed; the test system is arranged, and the air pump and hydraulic pump are turned on to record the measured values ​​of the pressure sensor and the displacement sensor. In the present invention, an air pressure friction reaction device, a loading device and a testing device are combined into an independent load plate test system in a hole. The system provides support and reaction force support for the system through the friction between the air pressure film and the hole wall, and the test sensor directly measures the settlement of the load plate. The test of the load plate test in the hole is realized.

Description

technical field [0001] The invention belongs to the technical field of in-situ testing of geotechnical engineering, and in particular relates to a testing device and a testing method for compressive deformation modulus and strength of soil in a deep hole. Background technique [0002] The physical and mechanical properties of soil in nature vary widely due to the influence of its genetic conditions, climate and environment. Obtaining accurate physical and mechanical parameters of soil is not only an important content of engineering investigation, but also directly related to the safety and rationality of engineering design. sex. In engineering, the test results of geotechnical laboratory are often used as the design basis, but soil is a typical three-phase granular bulk accumulation, and the disturbance during sampling, the change of boundary conditions, the transportation process, and the size effect all have certain influence on the test results, so Carrying out in-situ t...

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Problems solved by technology

However, there is currently no test system and method for the load plate in the hole. Generally, the hole is manually excavated and placed in a large-diameter load plate and then loaded at the hole. The dowel bar is used to provide the reaction force for the load plate at the bottom of the hole. Measuring the displacement of the load plate at the bottom of the hole on the surface, longer dowel rods and displacement rods have a greater impact on the micron-level test accuracy requirements, and the risk of manual digging is high, the depth is small, the cost is high, and the cycle is long. Only in important subways There are few applications in design project survey

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