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节理、裂隙作为高陡边坡常见的地质缺陷,对其长期变形和稳定造成重大危害。为研究节理、裂隙岩体卸荷流变力学特性,以贯通裂隙岩体为试验对象,进行不同卸荷路径下的流变试验。试验结果表明:贯通裂隙岩体轴向及侧向流变各向异性显著,侧向流变变形在节理、裂隙作用下随流变时间延长,围压卸荷量增大较轴向更为显著;在一次及分级卸荷流变对比试验中,相同条件下分级卸荷流变变形发展更充分,对岩体扰动更大,但试样破坏形态分析表明一次卸荷流变更易导致岩体破坏。根据试验成果,利用Burgers流变模型,分析卸荷流变参数,建立各参数在不同卸荷路径下的线性函数关系,并将函数关系代入Burgers流变模型,得到能综合反映不同卸荷路径影响的岩体流变模型。研究成果可为高陡边坡长期稳定理论研究及工程设计提供参考。
Joints and fissures, as common geological defects on high steep slopes, have caused great harm to their long-term deformation and stability. In order to study the rheological properties of joints and fractured rock mass unloading, the rheological tests under different unloading paths were carried out with fractured rock mass as test object. The experimental results show that the axial and lateral anisotropy of the through rock mass is significant, and the lateral rheological deformation is prolonged with the rheological time under the action of joints and fractures. The increase of the unloading of the confining rock mass is more significant than that of the axial direction In the first and graded unloading rheological comparison tests, the rheological deformation of graded unloading under the same conditions developed more fully, which disturbed the rock mass more greatly. However, the morphological analysis of the specimen showed that the unloading flow was more likely to lead to the failure of the rock mass . According to the experimental results, the Burgers rheological model was used to analyze the unloading rheological parameters and to establish the linear function of each parameter under different unloading paths. The functional relationship was substituted into the Burgers rheological model, and the effect of different unloading paths Rock mass rheological model. The research results can provide references for the long-term stability theoretical research and engineering design of high-steep slope.