A test device for shear mechanical properties of pile-soil contact surface

Abstract

The invention discloses a pile-soil contact surface shearing mechanical-characteristic testing device which comprises a supporting device, a pressure chamber, a pressure device, multiple thrust devices and multiple horizontal fixing devices. The supporting device comprises a frame, a supporting plate and a counter-force frame arranged above the supporting plate. The pressure chamber is arranged onthe supporting plate and comprises a top plate, a base plate and multiple outer-side vertical plates slidingly arranged between the top plate and the base plate, the base plate, the top plate and themultiple outer-side vertical plates jointly define a cavity for containing a pile sample and a soil sample, and the horizontal cross section of the cavity can be adjustable in size. The testing device can exert horizontal thrusts to different sides of the pressure chamber through the multiple thrust devices so as to exert horizontal forces to the sides of the pile sample by extruding the soil sample, and can effectively simulate the pile foundation stress working conditions under the situation that soil body pressures exerted in different directions around a pile are different and make the working conditions have high similarity with actual working conditions. The testing device can test pile foundations of round and square piles and the like with regular-shaped cross sections.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a device for testing the shear mechanical properties of pile-soil contact surfaces. Background technique [0002] With the rapid development of urban construction in our country, in order to build more building areas in a smaller land area, buildings have to develop to high-rise buildings. Therefore, in recent years, more and more high-rise and super high-rise buildings have been constructed. The bearing capacity of the foundation foundation is required to be high, and the pile foundation is widely used in foundation engineering as a main foundation form. tend to diversify. For example, retaining piles are mostly used for supporting and retaining soil at the initial stage of the project. However, in order to give full play to the role of retaining piles and reduce project cost, retaining piles will be used for vertical bearing. Therefore, the study of retaining piles B...

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Problems solved by technology

[0003] Chinese patent application CN201710050592.1 discloses a pile-soil contact surface shear test device that can simulate changes in overlying pressure. The device includes a circular model box, a loading plate, a reaction beam and a servo loading motor. The circular model box consists of Composed of a circular frame and a base, the inside of the model box needs to be filled with a certain degree of dense sand, and an earth pressure sensor is placed inside the sand to test the vertical and horizontal earth pressure; the loading plate is placed on the upper surface of the sand layer to apply the overlying pressure through a jack The servo loading motor can adopt two loading methods: displacement control and load control. The model pile at the center of the model box is loaded through the servo motor. During the loading process, the load and displacement applied by the servo motor can be automatically collected; but this device can only be used for Study on Friction Performance of Pile-Soil Contact Surface under Different Overlying Pressure

However, the horizontal loading mechanism in this device acts on the model, and cannot be used to simulate the stress conditions of the pile foundation under the different horizontal ground pressures on the sides of the pile in actual engineering.

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