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Experimental Study on Shear Behavior and Failure Mechanism of Bolted Heterogeneous Rock Joints under Different Anchorage Conditions
Geofluids ( IF 1.7 ) Pub Date : 2021-06-07 , DOI: 10.1155/2021/9958352
Xianzhen Cheng 1, 2 , Hengjie Luan 1, 2 , Yujing Jiang 1, 2, 3 , Sunhao Zhang 1, 2 , Chuanyang Jia 4
Affiliation  

Despite their frequent natural occurrence and engineering encounter, heterogeneous rock joints (rock joints with different lithological characters on both sides of the joint surface) have been studied much less systematically. To study the shear behavior and failure mechanism of bolted heterogeneous rock joints, laboratory tests were performed on the heterogeneous rock joints having different joint roughness coefficients (JRC) under different anchorage conditions. The results indicate that shear strength increases with the increase of JRC, showing exponential growth. Under the same roughness, the shear strengths of rock joints from large to small are fully grouted, end anchorage, and without anchorage. The mechanical characteristics of the bolt and joint are poorly matched under the end anchorage condition, which is easy to cause these two to be broken one by one. Under fully grouted, the extrusion force caused by the rock bolt will diffuse around the anchorage agent and will not cause partial continuous damage. The surface damage of heterogeneous rock joints increases with the increase of JRC and presents obvious heterogeneous characteristics. The shear dislocation between the blocks under shear load results in the interaction between the bolt and surrounding media. Under the action of shear force, the bolt body produced both axial and transverse deformation, which leads to breakage of anchorage agent and rock mass. Rock bolt has a significant impact on the shear behavior of the anchorage system, and the damage of the rock bolt to rock mass should be considered in rock engineering reinforcement design.

中文翻译:

不同锚固条件下锚杆非均质岩石节点剪切行为及破坏机理试验研究

尽管它们经常发生自然发生和工程遭遇,但对非均质岩石节理(节理面两侧具有不同岩性特征的岩石节理)的研究较少。为研究锚固异质岩石节理的剪切行为和破坏机制,在不同锚固条件下对具有不同节理粗糙度系数(JRC)的异质岩石节理进行了室内试验。结果表明,剪切强度随着JRC的增加而增加,呈指数增长。在相同粗糙度下,岩石节理的抗剪强度由大到小分别为全灌浆、端部锚固和不锚固。在端部锚固条件下,螺栓与接头的力学特性匹配不良,这很容易导致这两个被一一打破。在完全灌浆情况下,锚杆产生的挤压力会在锚固剂周围扩散,不会造成局部连续破坏。非均质岩石节理的表面损伤随着JRC的增加而增加,呈现明显的非均质特征。在剪切载荷下块体之间的剪切错位导致螺栓与周围介质之间的相互作用。在剪切力的作用下,锚杆体产生轴向和横向变形,导致锚固剂和岩体破裂。锚杆对锚固系统的剪切行为有显着影响,在岩石工程加固设计中应考虑锚杆对岩体的破坏。锚杆产生的挤压力会在锚固剂周围扩散,不会造成局部连续破坏。非均质岩石节理的表面损伤随着JRC的增加而增加,呈现明显的非均质特征。在剪切载荷下块体之间的剪切错位导致螺栓与周围介质之间的相互作用。在剪切力的作用下,锚杆体产生轴向和横向变形,导致锚固剂和岩体破裂。锚杆对锚固系统的剪切行为有显着影响,在岩石工程加固设计中应考虑锚杆对岩体的破坏。锚杆产生的挤压力会在锚固剂周围扩散,不会造成局部连续破坏。非均质岩石节理的表面损伤随着JRC的增加而增加,呈现明显的非均质特征。在剪切载荷下块体之间的剪切错位导致螺栓与周围介质之间的相互作用。在剪切力的作用下,锚杆体产生轴向和横向变形,导致锚固剂和岩体破裂。锚杆对锚固系统的剪切行为有显着影响,在岩石工程加固设计中应考虑锚杆对岩体的破坏。非均质岩石节理的表面损伤随着JRC的增加而增加,呈现明显的非均质特征。在剪切载荷下块体之间的剪切错位导致螺栓与周围介质之间的相互作用。在剪切力的作用下,锚杆体产生轴向和横向变形,导致锚固剂和岩体破裂。锚杆对锚固系统的剪切行为有显着影响,在岩石工程加固设计中应考虑锚杆对岩体的破坏。非均质岩石节理的表面损伤随着JRC的增加而增加,呈现明显的非均质特征。在剪切载荷下块体之间的剪切错位导致螺栓与周围介质之间的相互作用。在剪切力的作用下,锚杆体产生轴向和横向变形,导致锚固剂和岩体破裂。锚杆对锚固系统的剪切行为有显着影响,在岩石工程加固设计中应考虑锚杆对岩体的破坏。在剪切力的作用下,锚杆体产生轴向和横向变形,导致锚固剂和岩体破裂。锚杆对锚固系统的剪切行为有显着影响,在岩石工程加固设计中应考虑锚杆对岩体的破坏。在剪切力的作用下,锚杆体产生轴向和横向变形,导致锚固剂和岩体破裂。锚杆对锚固系统的剪切行为有显着影响,在岩石工程加固设计中应考虑锚杆对岩体的破坏。
更新日期:2021-06-07
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