Flexible loading device and method for simulating uniform stress on surface of cylindrical anchorage model

Abstract

The invention discloses a flexible loading device and method for simulating uniform stress on the surface of a cylindrical anchorage model. The flexible loading device comprises a constraint force device, an annular high-pressure loading air bag, air pipes, a flexible and retractable hoop sleeve and flexible force transfer rubber, wherein the annular high-pressure loading air bag is of an annular cylinder structure; the flexible and retractable hoop sleeve is attached to the inner ring surface of the annular high-pressure loading air bag, comprises arc sleeves, arc compressed springs, arc connecting rods and arc loading force transfer plates, and is of a cylindrical structure; the flexible force transfer rubber is attached to the inner surfaces of the arc loading force transfer plates and makes direct contact with the cylindrical anchorage model. The flexible and retractable hoop sleeve can retract inwards automatically under the loading constraint action of the annular high-pressure loading air bag, and the cross section of the model in a retracting process keeps round all along. The flexible loading device can be used for effectively simulating a radial uniform stress effect on the surface of the model in an indoor pull-out test of the cylindrical anchorage model, and the cross section of the cylindrical model in a loading process keeps round all along.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering anchor rod (cable) tests, in particular to an axisymmetric flexible restraint loading device and a use method for simulating the radial uniformly distributed surrounding rock stress on the surface of an indoor cylindrical anchor model. Background technique [0002] Geotechnical anchoring technology can give full play to and improve the self-strength and self-stabilization ability of rock and soil, significantly reduce the volume of structures and reduce the weight of structures, and effectively control the deformation of rock and soil. It is the most widely and effective method in the field of geotechnical engineering. Moreover, with the current economic and social progress and the development of science and technology, various new types of anchor rods and anchor cables are also showing a trend of continuous emergence. According to incomplete statistics, there are currently more t...

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Problems solved by technology

However, this factor is seldom considered in the existing drawing tests, and the relevant experimental research results have never seen

In particular, people are generally accustomed to processing the anchor solid specimen composed of anchor (cable) rod body, anchoring agent and rock-soil body into a cylindrical model. If a traditional hydraulic cylinder is used with a rigid thruster, the It is difficult to apply radially uniform surrounding rock pressure, and special design of the oil cylinder structure is required to meet the requirements, and the contact area between the rigidly loaded thruster and the cylindrical anchor model specimen surface is also small due to the traditional hydraulic cylinder. Very limited, unable to guarantee the uniformity of the surrounding rock pressure distribution along the circumferential direction of the surface of the cylindrical model

Once the cylindrical anchor model is subjected to non-uniform loading pressure during the test process and cracks or extrusion deformation occurs, it will be difficult to ensure a circular cross-section of the anchor model, which will not be able to effectively simulate the stress of the surrounding rock uniformly distributed on the surface of the model, reducing the test performance. precision

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