全长粘结式锚杆与隧道围岩相互作用研究  

STUDY ON THE INTERACTION OF WHOLE BONDED ROCK BOLT AND TUNNEL SURROUNDING ROCK

作　　者：方勇[1] 何川[1] 

机构地区：[1]西南交通大学地下工程系,成都610031

出　　处：《工程力学》2007年第6期111-116,共6页Engineering Mechanics

基　　金：国家高技术研究发展专项(863计划)经费资助(2006AA11Z116)

摘　　要：提出了一种新的锚杆计算模型,建立了对应的物理、几何和平衡方程,在此基础之上分析了接触面产生滑移时锚杆的内力分布。该模型体现了锚杆与均质围岩之间的力学作用本质,将锚杆内力描述为围岩位移的函数,与有限元法结合,可以求得复杂情况下的锚杆内力分布,而锚杆对围岩的作用等效于一组节点荷载施加到围岩节点上。实例计算表明,锚杆可以减少围岩位移和塑性区范围,其内力分布和中性点位置受锚杆长度、埋设位置、围岩状况、粘结强度等因素的影响。该模型为确定合理的锚杆支护参数提供了一种新途径。A new computational model for rock bolt has been developed, and its physical, geometrical and equilibrant equations have also been built. On the basis of this model the distribution of internal force along the bolt with interface slipping was analyzed. This model indicates the essences of the interaction between bolts and homogeneous surrounding rocks, describes the internal force of bolt as the function of surrounding rock displacement. Combined with finite element method, internal force distribution in complex conditions can be obtained, and the bolt＇s action on the surrounding rock is equal to a group of nodal loads that are applied to the surrounding rock nodes. A sample computation shows that bolts can reduce the displacement and plasticity zone of surrounding rock, and the internal force distribution and neutral point site are affected by bolt length, burying site, surrounding rock conditions, bonding intensity, and so on. The proposed model provides a new way to determine reasonable parameters for rock bolt supporting.

关 键 词：隧道 锚杆 围岩 接触面 中性点 内力分布 

分 类 号：TU311[建筑科学—结构工程]