破碎岩体深埋隧洞锚承载特性现场试验研究  

In-situ Experimental Study on Bearing Characteristics of Deep-Buried Tunnel Anchorage in Fractured Rock Mass

作　　者：郭喜峰[1] 王中豪[1] 吴相超[1] GUO Xifeng;WANG Zhonghao;WU Xiangchao(Chongqing Branch Changjiang River Scientific Research Institute,Chongqing 400026,China)

机构地区：[1]长江科学院重庆分院,重庆400026

出　　处：《西南交通大学学报》2020年第6期1240-1246,共7页Journal of Southwest Jiaotong University

基　　金：国家重点研发计划(2016YFC0401801,2016YFC0401803);四川省交通运输科技项目(2013 A1-3,2014-C-1);交通运输部建设科技项目(2013318800020)。

摘　　要：为了研究破碎岩体深埋隧洞锚承载特性,以泸定大渡河特大桥为工程背景,根据原位试验获得的混凝土与岩体接触面峰值抗剪强度参数计算锚塞体抗拔安全系数;介绍了1∶10现场原型缩尺试验成果,研究了模型锚极限荷载和强度特性;最后对隧洞锚稳定性作出了整体评价,并提出了工程施工建议.研究结果表明:锚塞体抗拔安全系数为3.48,满足规范规定的稳定性要求;模型锚极限荷载为7.80P(P为设计荷载),模型锚碇系统屈服载荷的特征点为5.25P.In order to study the bearing characteristics of the deep-buried tunnel anchorage in the fractured rock mass,and in the engineering background of Luding Dadu river Bridge,according to the peak shear strength parameters of the contact surface between concrete and rock mass obtained by in-situ test,the safety factor of the anchor plug was obtained.The in-situ test results of the 1∶10 scale model anchor were introduced,and the ultimate load and strength characteristics of the model anchor were studied.Finally,the overall stability of the tunnel anchor was evaluated,and the construction proposal was put forward.The results show that the safety factor of the anchor plug is 3.48,which meets the stability requirements of the specification.The model anchor has a limit load of 7.80P(P is the design load)and the model anchor system yield load characteristic point of 5.25P.

关 键 词：隧洞锚 原型缩尺试验 承载特性 安全系数 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]