Device and method for measuring frictional angle of interface of retaining wall and contact soil

Abstract

The invention relates to a device and a method for measuring a frictional angle of an interface of a retaining wall and contact soil. The device comprises a base, a counter-force frame, a roller slide rail, a bearing sliding table, a shear force applying cylinder, a loading force applying cylinder, a screw rod lifter, a screw rod lifter mounting rack, a retaining wall sample shearing box and a contact soil sample shearing box; the counter-force frame and the roller slide rail are fixedly arranged on the base; the loading force applying cylinder is vertically fixed at the top end of the counter-force frame; the shear force applying cylinder is horizontally and fixedly arranged on the base; pressure sensors are arranged at the ends of piston rods of the loading force applying cylinder and the shear force applying cylinder; the contact soil sample shearing box, the retaining wall sample shearing box, the screw rod lifter mounting rack, the bearing sliding table and the roller slide rail are arranged from top to bottom on the base. The method comprises the following steps: preparing the sample; mounting the sample; applying a loading force till reaching a preset value; applying a shear force to the contact soil sample, shearing and damaging; repeating multiple sets of shear damaging tests; and fitting the straight line of the loading force and the shear force, wherein an inclined angle of a fitting straight line is the frictional angle of the interface.

Description

technical field [0001] The invention belongs to the technical field of rock and soil mechanics tests, and in particular relates to a device and method for measuring the friction angle of the interface between a retaining wall and a contact soil body. Background technique [0002] In the design process of the retaining wall, the interface friction angle between the retaining wall and the contact soil is a necessary parameter for the calculation of the earth pressure, and the accuracy of the interface friction angle is also directly related to the accuracy of the calculation of the earth pressure and the accuracy of the retaining wall. Design success or failure. [0003] At present, the interface friction angle between the retaining wall and the contact soil is usually based on the type of soil and the empirical value given by similar projects, such as "Technical Code for Building Slope Engineering" (GB50330-2013), etc., resulting in the interface friction angle The numerical...

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Problems solved by technology

For the Chinese patent whose publication number is CN102012220A, it discloses a kind of granular material friction angle or angle of repose measuring device and measuring method, although the friction angle of granular material can be obtained based on the principle of inclinometer, but only the granular material and angle of repose can be obtained. The interface friction angle between the instruments, but the interface friction angle between two different materials cannot be obtained, and the obtained interface friction angle is significantly different from the interface friction angle between the retaining wall and the contact soil in the actual project

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