Shearing strength testing device for pile-soil interface

Abstract

The invention provides a shearing strength testing device for a pile-soil interface. The body structure includes a rack, an upper shearing box, a lower shearing box, a roller shaft, a hydraulic pressure control device, a horizontal jack, a vertical jack, a counter-force board, a top board, a first force-measuring steel rod, a second force-measuring steel rod, a force sensor and a force display control instrument. Compared with the prior art, a problem that inaccurate testing of the shearing force of the pile-soil interface can be solved well. The force sensor can be connected with the force measuring steel rods simply, the operability is high and the value change of the shearing force of the pile-coil interface can be tested timely. The shearing strength testing technique provided by the invention provides an effective testing means for studying mechanical characteristics of a pile and stress transmission mechanism.

Description

technical field [0001] The invention belongs to the technical field of pile foundation engineering, and relates to a device for testing the mechanical properties of the pile-soil interface, in particular to a device for testing the shear stress of the pile-soil interface. Background technique [0002] At present, there are few studies on the mechanical properties of the pile-soil interface at home and abroad. The on-site test is to install test elements on the side of the pile to actually test the lateral friction of the soil around the pile. However, this test method takes a long time, is expensive, and the test results are inaccurate. The indoor test has not yet formed a standard test method, and the test equipment is not perfect. The principle of the direct shear test device is often used. The large direct shear instrument used is generally composed of upper and lower shear boxes, vertical force loading system, and horizontal force loading system. , device providing react...

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Problems solved by technology

[0002] At present, there are few studies on the mechanical properties of the pile-soil interface at home and abroad. The on-site test is to install test elements on the side of the pile to actually test the lateral friction of the soil around the pile. However, this test method takes a long time, is expensive, and the test results are inaccurate. The indoor test has not yet formed a standard test method, and the test equipment is not perfect. The principle of the direct shear test device is often used. The large direct shear instrument used is generally composed of upper and lower shear boxes, vertical force loading system, and horizontal force loading system. , device providing reaction force, vertical displacement test system and horizontal displacement test system, the test of pile-soil interface shear stress is calculated by horizontal displacement, which cannot guarantee the accurate test of pile-soil interface shear stress, and cannot obtain the constant value of shear stress Variety

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