加锚异质岩层压剪脱黏破坏及锚固失效机理分析  

Analysis of de-bonding and failure mechanism of anchored composite strata under compression shear load

作　　者：赵增辉[1,2] 陈宝森 冯元慧[1,2] 孙伟[1] 刘浩[1] ZHAO Zenghui;CHEN Baosen;FENG Yuanhui;SUN Wei;LIU Hao(College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学能源与矿业工程学院,山东青岛266590 [2]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590

出　　处：《煤矿安全》2022年第3期221-228,共8页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51774196)。

摘　　要：针对异质岩层锚固失效,基于锚杆双线性强化本构模型,考虑黏结层拉压刚度劣化,构建了异质岩层-黏结层-锚杆锚固系统的三维精细化数值计算模型,分析了花岗岩-花岗岩、花岗岩-砂岩、砂岩-花岗岩、砂岩-砂岩4类不同岩性组合下锚杆应力传递规律以及锚固系统的变形破坏特征,揭示了不同岩性组合对加锚复合岩层剪切力学特性的影响规律。结果表明:压剪状态下穿层锚杆层理面局部区域为抗剪主体,层理面附近存在最大切应力;锚杆正应力的峰值与锚杆的穿层顺序有关;在同一边界条件下,锚杆限制同质硬岩的剪切移动效果最好;层理面附近锚固系统易发生脱黏破坏,黏结层刚度折减率大的位置总位于软岩部分。Aiming at the anchoring failure of heterogeneous rock strata, based on bolt bilinear strengthening constitutive model and considering the deterioration of tension and compression stiffness of bonded layer, a three-dimensional refined numerical calculation model of heterogeneous rock strata, bonded layer and bolt anchoring system was constructed. The stress transfer law of anchor bolt and deformation and failure characteristics of anchor system under granite-granite(H-H), granite-sandstone(H-S), sandstonegranite(S-H) and sandstone-sandstone(S-S) rock combinations were analyzed, and the influence law of different lithologic combinations on shear mechanical properties of anchor composite rock strata was revealed. The results show that the shear resistance is mainly in the local area of the bedding surface under compression shear state, and the maximum shear stress exists near the bedding surface. The peak value of bolt normal stress is related to the sequence of bolt penetration. Under the same boundary condition, the effect of rock bolt limiting shear movement of homogeneous hard rock is the best. The anchorage system near the bedding surface is prone to de-bonding failure and the position with large reduction rate of the stiffness of the bonded layer is always located in the soft rock part.

关 键 词：复合岩层 穿层锚固 结构效应 脱黏破坏 刚度折减率 

分 类 号：TD353[矿业工程—矿井建设]