文献类型：期刊文献

中文题名：昌宁隧道软岩大变形及NPR锚索开挖补偿支护技术

英文题名：Large deformation of soft rock and NPR anchor cable excavation compensation support technology in Changning tunnel

作者：陶志刚[1,2];张博[3];杨康[4];杨毅[4];郭鹏飞[5]

机构：[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083;[2]中国矿业大学(北京)力学与建筑工程学院,北京100083;[3]河北地质大学城市地质与工程学院,河北石家庄050031;[4]广西路桥工程集团有限公司,广西南宁530200;[5]绍兴文理学院土木工程学院,浙江绍兴312000

年份：2023

卷号：52

期号：4

起止页码：660

中文期刊名：中国矿业大学学报

外文期刊名：Journal of China University of Mining & Technology

收录：CSTPCD、、EI(收录号：20233614686743)、Scopus、CSCD2023_2024、北大核心、CSCD、北大核心2020

基金：国家自然科学基金项目(41941018)。

语种：中文

中文关键词：隧道工程;NPR锚索;控制技术;模型试验;现场试验

外文关键词：tunnelling engineering;NPR anchor cable;control technology;model test;field test

中文摘要：为控制昌宁隧道的软岩大变形,基于NPR锚索的恒阻吸能特性,通过物理模型试验和现场试验,研究了NPR锚索支护隧道围岩的变形力学机制和NPR锚索支护的控制效果.结果表明:在模型试验中,随着围岩应力增大,隧道两肩的收敛变形大于拱顶沉降,构造应力对围岩稳定性影响较大;在NPR锚索支护下,围岩未发生大面积破坏,隧道周围岩体应力分布较为均匀,应力集中现象不明显,NPR锚索支护起到了应力补偿效果;在隧道开挖过程中,NPR锚索的轴力从增长阶段过渡到稳定状态后,围岩变形收敛并停止增长,有效控制了围岩的变形.在现场试验中,NPR锚索能够将围岩变形量从原来的大于2 m减小到108 mm,并且减小了支护结构的受力,有助于避免昌宁隧道初期支护变形和二次衬砌破坏的隐患.

外文摘要：To control the large deformation of soft rock in the Changning tunnel,research was performed based on the constant resistance and energy absorption characteristics of the NPR anchor cable.The deformation mechanism of the surrounding rock in the tunnel supported by the NPR anchor cable and the controlling effect of the NPR anchor cable support were studied through physical tests and field tests.The results show that in the laboratory test,the convergence deformation of the shoulders is greater than the settlement of the vault in the tunnel,and the tectonic stress has a greater impact on the stability of the surrounding rock,with increasing stress in the surrounding rock.Under the support of the NPR anchor cable,large areas of the surrounding rock are not damaged,the stress distribution of the rock mass around the tunnel is relatively uniform,there is no obvious stress concentration,and the NPR anchor cable support plays a role in stress compensation.During tunnel excavation,there is a transition in the axial force of the NPR anchor cable from the growth stage to the stable state,and then the deformation of the surrounding rock converges and stop growing,which effectively controls the deformation of the surrounding rock.In the field test,the NPR anchor cable reduces the deformation of the surrounding rock from more than 2 m to 108 mm and reduces the stress of the support structure,which helps prevent deformation of the initial support and damage of the secondary lining of the Changning tunnel,two hidden types of dangerous conditions.