川藏铁路板块碰撞结合带地质建造特征的工程地质研究

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• 英文论文题名：Engineering Geological Research in Formations-structural Features of the Sichuan-Tibet Railway Plate Collision Junction
• 论文作者：蒋良文 ; 李渝生 ; 易树健 ; 毛邦燕 ; 黄超 ; 刘凯
• 英文论文作者：Jiang Liangwen ; Li Yusheng ; Yi Shujian ; Mao Bangyan ; Huang Chao ; Liu Kai ; China Railway Eryuan Engineering Group Co.Ltd ; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection ; Chengdu University of Technology
• 年：2016
• 作者机构：中铁二院工程集团有限责任公司劳模(专家)地质创新工作室;成都理工大学地质灾害防治与地质环境保护国家重点实验室;
• 论文关键词：板块结合带 ; 地质建造 ; 川藏铁路 ; 工程地质
• 英文论文关键词：plate junction ; geological formation ; Sichuan-Tibet railway
• 会议召开时间：2016-10-14
• 会议录名称：“川藏铁路建设的挑战与对策”2016学术交流会论文集
• 语种：中文
• 分类号：U212.22
• 学会代码：ZGTD
• 会议名称：“川藏铁路建设的挑战与对策”2016学术交流会
• 会议地点：中国四川成都
• 主办单位：中国铁道学会、中国铁道学会工程分会、中国中铁股份有限公司、中铁二院工程集团有限责任公司
• 学会名称：中国铁道学会
• 页数：12
• 文件大小：4809k
• 原文格式：O
• 会议级别：全国

摘要

本文通过对结合带地质建造、构造动力学特征及地壳岩体应力形变的深入分析,论证了结合带对川藏铁路区域工程地质环境的控制作用,分析由此产生的若干工程效应问题。①金沙江结合带由不同时代、性质的岩块和基质混杂而成,其岩体NE向压缩变形、西侧岩浆岩体的高地应力及东侧三叠系的软岩大变形,是制约铁道工程的主要工程地质问题;③澜沧江结合带对区域沉积建造、火山活动、构造变质变形等具有明显的控制作用,结合带表现为强烈的挤压逆冲及压缩变形,西侧地块表现出较为活跃的构造动力学特点,东侧则处于相对的稳定状态,对铁道工程的影响主要是岩体压缩变形及西侧岩浆岩体的高地应力问题;③怒江结合带控制着区域工程地质条件的形成与发展,南西侧表现为沉积建造和陆缘火山岛弧建造,北东侧则为陆相碎屑岩沉积建造,结合带岩体的工程问题主要为兼具右旋剪切的强压缩变形、南西侧高地应力以及北东侧软岩隧道的大变形问题;④雅鲁藏布结合带现已基本"焊接愈合",地壳岩体发生南北向压缩变形,地应力积累和断裂活动主要发生在结合带的南边界断裂,结合带关键工程地质问题是高地应力效应、北侧花岗岩体的地热异常问题、南侧边坡岩体稳定及地下工程塑性围岩的大变形问题。
Through in-depth analysis of the structure combined with the dynamic characteristics of rock mass stress and crustal deformation effect,demonstrating in conjunction with geological formations-tectonic control of the Sichuan-Tibet Railway regional engineering geological environment,the article analyzed a number of engineering problems which junction zone caused.①The Jinshajiang combination zone mixed together by different times,different nature of the rock matrix.The junction NE compression deformation,the west side of magma rock mass high stress and the soft rock on the eastern side of the Triassic rocks area large deformation are the main engineering geological problems restricting tunnel project.②Lancangjiang junction zone obviously controlled regional sedimentary formations,volcanic activity,tectonic metamorphism and deformation.Belt rock mass is mainly for strong thrust and compression deformation.The west side of plots show that the active tectonic dynamics characteristics,the east of continental blocks,on the other hand,in a relatively stable state.Influence on railway engineering is mainly compressive deformation of rock mass,the west side of magmatic rock and high ground stress problem.③ Nujiang junction zone controlled the formation and development of regional engineering geological conditions.In the southwest side,the land is composed of sedimentary formation and continental margin volcanic arc construction.Northeast South land mass is mainly continental clastic sedimentary formation.The main problems of junction zone rock engineering are for the strong effect of both dextral shear and compression,high stress of the southwest side and north east side soft rock tunnel big deformation.④The Yarlung Zangbo combination zone has been basically "weld healing".The crust rock performance for the north-south compression,and the accumulation of stress and faulting occurred in conjunction with the southern boundary fault.The key engineering geological problems of tectonic melange are high stress and rock mechanical effects,geothermal unusual problem of the north granite and large deformation of rock slope stability and underground engineering plastic rock in the south.

引文

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