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| Development of a rock gradient stress loading test device and its primary application |
| JIN Jiefang1，ZHANG Rui1，WANG Xibo1，WU Yue2，YU Xiong1，ZHONG Yilu1#br# |
| (1. School of Architectural and Surveying Engineering，Jiangxi University of Science and Technology，Ganzhou，Jiangxi 341000，China；2. School of Resource and Environmental Engineering，Jiangxi University of Science and Technology，Ganzhou，Jiangxi 341000，China) |
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Abstract The surrounding rock is subjected to linear or nonlinear gradient geo-stress. However, there is no ideal loading test method and device for applying gradient stress on rock，which has severely restricted the investigation of mechanical properties of rock under gradient stresses. Based on the distribution regularities of the tangential and radial stresses around underground circular opening，a new test device was developed to simulate the gradient static stress environment on a long rock specimen. The loading device system consists of a base platform and horizontal close load-bearing bracket，an axial loading device，a transverse loading device，and some auxiliary parts and tools. The key test techniques for determining the normal forces on upper and lower lateral sides of specimens，the thickness of the rubber blanket，the static friction coefficient between red sandstone/stainless steel and rubber blanket were studied. The long specimens were prepared with stainless steel and red sandstone. The gradient stress loading tests of stainless steel and red sandstone specimens were carried out to verify the feasibility of the proposed test method and device system. The results show that the test method and device system can ideally simulate linear and nonlinear gradient static stress on a long specimen，and that the test device system is easy to operate and can realize various static stress gradient modes. When the uniform bolt tightening torque is applied on red sandstone specimens，the cross-section of specimens will have linear gradient static stress and nonlinear gradient static strain. With increasing the bolt tightening torque，the curvature of the gradient strain curve becomes smaller and smaller. When the non-uniform bolt tightening torque is applied on red sandstone specimens，both the stress and the strain on the cross-section of red sandstone specimens are nonlinear. As the non-uniform gradient of the bolt tightening torque increases，the non-linear gradient of the axial compressive strain becomes larger.
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2020, Vol. 39 
