文献类型：期刊文献

中文题名：加锚异性结构面剪切破坏及声发射特征研究

英文题名：Study on Shear Failure and Acoustic Emission Characteristics of Anchored Anisotropic Structural Plane

作者：高军强[1];刘广建[1];杜时贵[1,2];贾瑞锋[1];王康宇[1];徐钰东[1]

机构：[1]绍兴文理学院土木工程学院,浙江绍兴312000;[2]宁波大学土木与环境工程学院,浙江宁波315211

年份：2023

期号：9

起止页码：37

中文期刊名：金属矿山

外文期刊名：Metal Mine

收录：CSTPCD、、Scopus、北大核心、北大核心2020

基金：国家自然科学基金项目(编号:42107177);浙江省自然科学基金项目(编号:LQ20E040002)。

语种：中文

中文关键词：加锚;异性结构面;直剪;抗剪强度;声发射

外文关键词：add anchor;heterosexual structural plane;direct shear;the shear strength;acoustic emission

中文摘要：自然界中广泛存在着两侧岩性不同的结构面,工程中常用锚杆抑制结构面的滑动。为了研究加锚异性结构面的直剪特性,开展了室内直剪试验,结合声发射监测结果,探讨了加锚异性结构面的抗剪强度、破坏类型及裂隙演化规律。研究结果表明:随着加锚异性结构面弱侧壁岩强度增加,抗剪强度呈非线性增加趋势,结构面加锚时的抗剪强度相比未加锚时依次提高了200%、267%、303%,破坏类型依次为剪切、拉剪、劈裂,且主裂纹方向与剪切方向基本一致;加锚异性结构面剪切—位移曲线分为压密、弹性、屈服、破坏4个阶段,压密阶段锚固剂出现挤压破坏,弹性阶段岩体与锚杆挤压处出现裂隙,屈服阶段锚杆承担主要抗剪力且发生了变形,破坏阶段岩样被剪碎;当结构面弱侧壁岩强度较低时,声发射事件集中在弹性阶段,当其壁岩强度较高时,声发射事件集中在屈服阶段;随着结构面弱侧壁岩强度增加,当λ<1时岩样产生大尺度剪切裂隙,当λ≥1时岩样产生小尺度剪切裂隙。

外文摘要：There are structural planes with different lithology on both sides in nature,and anchors are commonly used in engineering to inhibit the sliding of structural planes.In order to study the direct shear characteristics of anchored anisotropic structural plane,the direct shear experiment was carried out.Combined with the results of acoustic emission monitoring,the shear strength,failure type and crack evolution law of the anchored anisotropic structural plane are discussed.The results show that:With the increase of the strength of the weak sidewall rock in the anisotropic structural plane with anchor,the shear strength increases nonlinearly.The shear strength of the structural plane with anchor increases by 200%,267%and 303%re-spectively compared with that without anchor.The failure types are shear,tensile shear and splitting,and the main crack direc-tion is basically the same as the shear direction;The shear-displacement curve of anchoring anisotropic structural plane is di-vided into four stages:compaction,elasticity,yield and failure.In the compaction stage,the anchoring agent is squeezed and de-stroyed.In the elastic stage,cracks appear at the extrusion position of rock mass and anchor bolt.In the yield stage,the anchor bolt undertakes the main shear resistance and deforms.In the failure stage,the rock sample is cut and broken.When the strength of the weak side rock of the structural plane is low,the acoustic emission events are concentrated in the elastic stage.When the strength of the wall rock is high,the acoustic emission events are concentrated in the yield stage;With the increase of strength of weak sidewall rock in structural plane,whenλ<1 rock specimen produces large-scale shear cracks,whenλ≥1 rock specimen produces small-scale shear cracks.