摘要
引汉济渭输水隧洞横穿秦岭山脉,是影响和控制引汉济渭整体工程进度的关键区段。而秦岭造山带复杂的岩性和构造特征对输水隧洞的施工和维护影响巨大。对输水隧洞围岩的变形构造特征进行深入的地质分析,可以为工程建设提供重要的地质依据。在野外地质工作基础上,文章结合对典型岩石样品薄片的镜下观察以及岩石力学试验,获取了南秦岭段围岩构造数据及力学特性数据。根据围岩宏观与微观构造特征可将南秦岭段划分为四个岩性区段:高角闪岩相片麻岩段、低角闪岩相变质岩段、浅变质岩段和花岗岩段。对围岩工程特性影响制约的变形构造进一步可划分为两类:其一为发育脆性变形的围岩,受中新生代以来陆内构造演化阶段的影响,脆性变形极为发育,对工程施工的影响最为直观明显;另一类为具软弱结构面的围岩,软弱结构面的发育使整个岩体的力学特性具有显著的各向异性,而软弱结构面的倾向与主应力方向的关系制约着围岩力学性质。
The water conveyance tunnel of the Hanjiang-to-Weihe River Valley Water Diversion Project,which crosses the Qinling Mountains,is a key section that affects the overall progress of the Project.The complex lithology and tectonic characteristics of the Qinling Orogenic Belt have a huge impact on the construction and maintenance of the water conveyance tunnel.An in-depth geological analysis of the tentonic characteristics of the tunnel surrounding rocks can provide an important geological basis for the construction of the Project.Based on field geological work,this paper combines microscopic observation of typical rock sample slices and rock mechanics tests to obtain the tectonic data and mechanical properties of the surrounding rocks in the South Qinling section.The South Qinling section can be divided into four lithological sections according to the macro and micro tectonic characteristics of the surrounding rocks:gneisses section of upper amphibolite facies,metamorphic rock section of lower amphibolite facies,epimetamorphic rock section and granite section.The deformed structure that affects and constrains the engineering characteristics of the surrounding rocks can be further divided into two categories:one is the surrounding rocks that develop brittle deformation,which are affected by the intracontinental tectonic evolution since the Middle Cenozoic with the brittle deformation extremely developed and have the most intuitionistic and obvious impact on the project construction.The other is the surrounding rocks with weak structural surfaces,which causes the mechanical properties of the whole rock mass to have significant anisotropy,and the relationship between the occurrence of weak structural surfaces and the orientation of principal stress governs the mechanical properties of the surrounding rocks.
作者
张杰
李玮
李立民
万继伟
丁卫华
贾超
ZHANG Jie;LI Wei;LI Limin;WAN Jiwei;DING Weihua;JIA Chao(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi′an 710069;China Railway First Survey and Design Institute Group Co.,Ltd.,Xi′an 710043;Hanjiang-to-Weihe River Valley Water Diversion Project Construction Co.,Ltd.,Shaanxi Province,Xi′an 710010;Institute of Geotechnical Engineering,Xi′an University of Technology,Xi′an 710048)
出处
《现代隧道技术》
CSCD
北大核心
2021年第3期23-32,共10页
Modern Tunnelling Technology
基金
国家自然科学基金(41572179,41372204)
国家重点研发计划(2016YFC0401804)
2013年陕西省科技统筹创新工程计划项目(2013KTZB03-01-01)
陕西省引汉济渭工程建设有限公司科研项目(引汉建函[2014]93号)
西北大学大陆动力学国家重点实验室科技部专项经费联合资助。
关键词
引汉济渭
输水隧洞
构造特征
工程特性
秦岭造山带
Hanjiang-to-Weihe River Valley Water Diversion Project
Water conveyance tunnel
Tentonic characteristics
Engineering characteristics
Qinling Orogenic Belt
作者简介
张杰(1994-),男,硕士研究生,主要从事隧道及工程地质方面的研究工作,E-mail:939112257@qq.com;通讯作者:李玮(1973-),男,教授,博士生导师,主要从事造山带构造地质和构造变形的研究工作,E-mail:liwei@nwu.edu.cn.
