浙江省某超长输水隧洞围岩收敛施工期观测分析  

Observation and Analysis on the Convergence of Surrounding Rocks during Construction of a Super-long Water Conveyance Tunnel in Zhejiang

作　　者：徐刚 魏海云[1,2,3] 黄剑锋 赵震波 卢立 XU Gang;WEI Hai-yu;HUANG Jian-feng;ZHAO Zhen-bo;LU Li(Zhejiang Institute of Hydraulics&Estuary,Hangzhou 310020,Zhejiang,China;Zhejiang Guangchuan Engineering Consultation Co.Ltd.,Hangzhou 310020,Zhejiang,China;Zhejiang Provincial Key Laboratory of Hydraulic Disaster Prevention and Mitigation,Hangzhou 310020,Zhejiang,China;Zhejiang Design Institute of Water Conservancy and Hydroelectric Power,Hangzhou 310002,Zhejiang,China)

机构地区：[1]浙江省水利河口研究院,浙江杭州310020 [2]浙江广川工程咨询有限公司,浙江杭州310020 [3]浙江省水利防灾减灾重点实验室,浙江杭州310020 [4]浙江省水利水电勘测设计院,浙江杭州310002

出　　处：《浙江水利科技》2020年第3期34-37,40,共5页Zhejiang Hydrotechnics

基　　金：浙江省基础公益研究计划项目(LGF18E090003)。

摘　　要：通过浙江省某超长输水隧洞围岩收敛施工期观测分析,总结"新奥法"施工的隧洞收敛变形一般规律。由于围岩开挖的时空效应,开挖初期位移增大,随着时间的增加和测点离掌子面的距离越来越远,一般情况下围岩的变形速率越来越小,位移逐渐趋于稳定。硬质围岩变形在较短时间内趋于稳定,且收敛变形较小;软质围岩变形蠕变时间长,收敛变形较大。工程观测结果反映围岩变形发展动态,并及时报警并采取加强支护的措施,加固后变形速率逐渐减小,围岩变形趋于稳定,确保工程施工安全和经济性。By observing and analyzing the convergence of surrounding rocks during construction of a super-long water conveyance tunnel in Zhejiang,this paper summarizes general rules of tunnel convergence by using New Austrian Tunneling Method (NATM).Due to the time-space effect of surrounding rock excavation,the displacement increases at the initial stage of excavation.With the increase of time and the distance from the measuring point to the working area,the deformation rate of surrounding rock becomes smaller and smaller,and the displacement tends to be stable gradually.The deformation of hard surrounding rock tends to be stable in a short time,and the convergence deformation is small;the deformation of soft surrounding rock takes a long time,and the convergence deformation is large.The observation results of the project reflect the development trend of surrounding rock deformation,and give an alarm in time and take measures to strengthen support.After reinforcement,the deformation rate decreases gradually,and the surrounding rock deformation tends to be stable,so as to ensure the safety and economy of the project construction.

关 键 词：输水隧洞 硬质围岩 软质围岩 收敛变形 拱顶下沉 

分 类 号：TV672[水利工程—水利水电工程]