川藏铁路交通廊道板块碰撞结合带地壳应力—形变特征及工程效应研究

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• 英文论文题名：The Study on Crustal Stress-Deformation Features and Engineering Effects of Plate Collision Zone of Sichuan-Tibet Railway
• 论文作者：毛邦燕 ; 李渝生 ; 黄超 ; 蒋良文 ; 刘凯 ; 易树健
• 英文论文作者：Mao Bangyan ; Li Yusheng ; Huang Chao ; Jiang Liangwen ; Liu Kai ; Yi Shujian ; Geological Innovation Studio of CREEC ; State Key Lab.of Geo-hazard Prevention and Geo-environment Protection ; Chengdu University of Technology
• 年：2016
• 作者机构：中铁二院地质创新工作室;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：川藏铁路 ; 板块碰撞结合带 ; 地壳应力—形变 ; 数值模拟
• 英文论文关键词：Sichuan-Tibet railway ; plate collision zone ; crustal stress-deformation ; numerical simulation
• 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：14
• 文件大小：5997k
• 原文格式：O
• 会议级别：全国

摘要

川藏铁路工程区穿越金沙江结合带、澜沧江结合带、怒江结合带及雅鲁藏布江结合带4条规模巨大的板块碰撞结合带。结合带地壳岩体的应力—形变问题,对铁道工程的规划选线及优化设计有着较大的影响。本文基于对结合带地质建造—构造特征深入的现场调查,结合区域地球物理场及深部构造信息,建立了结合带地壳结构的地质—力学概念模型。采用数值模拟分析方法,对结合带地壳岩体应力—应变特征、构造动力学机理以及工程效应等诸方面问题,进行了深入的探讨。研究成果表明,各结合带的应力应变特征有所差异。金沙江结合带地壳深部的两层低速软弱层,以"传送带"的动力模式驱动上地壳岩体运移,结合带西侧岩浆岩对地壳岩体应力—形变作用起到显著的"屏蔽"作用。该结合带对铁道工程的影响主要为NE向压缩变形、西侧岩浆岩段隧道工程的高地应力问题以及东侧软岩的大变形问题。澜沧江结合带及其西侧的岩浆岩体对应力应变的传递有显著的消减作用,导致在结合带部位产生明显的应力集中。该结合带对铁道工程的影响主要表现在NE向压缩变形、结合带及其西侧岩浆岩体隧道工程的高地应力问题,其东侧为相对稳定的地块,工程建设条件相对较好。雅鲁藏布江结合带对南侧印度板块巨大推力产生的水平位移有显著的消减作用,主要表现为结合带内部岩体的压缩变形和南边界断裂的应力集中。该结合带对铁道工程的作用主要为结合带内部岩体强烈的压缩变形、南边界断裂的活动性及高地应力问题,结合带北侧具块状刚性特征的冈底斯地块是铁道工程建设较为理想的区域。
Sichuan-Tibet railway is going to across four huge scale plate collision zone including JinSha Jiang combination zone,LanCang Jiang cmbination zone,Nu Jiang combination zone and Yaluzangbu Jiang combination zone.The crustal rock stress-deformation of these collision belts have greatly influence and restriction to railway engineering construction.Based on field investigation of geological formations and structure,a geomechanics conceptual model of crustal structure of collision belts was established combining geophysical data.The stress-deformation features and engineering effects were analyzed by using finite element numerical simulation method.The results indicate that the crustal rock stress-deformation of these collision belts are different.For JinSha Jiang combination zone,two high-conductivity weak layers in the crust flow to NE driving upper rock,forming a dynamic model like "conveyor belt",the magmatite on the west of JinSha Jiang combination zone plays a shielding role in the stress and movement of crust.Three aspects on railway engineering were caused by combination zone:compressive deformation along NE,high ground stress of tunnel in the magmatite region,large deformation of soft rock on the east of combination zone.LanCang Jiang combination zone and western magmatite have a remarkable subduction to stress-deformation of crustal rock,causing stress concentration on these sections of combination zone.Its impacts on railway engineering mainly include compressive deformation of rock mass and high geostress problem in tunnel engineering of the west side magmatic rock mass,its east is a relatively stable block,which is benefit to the construction of railway engineering.Yaluzangbu Jiang combination zone has a remarkable subduction to the displacement generated by India plate pushing,major performances were compression deformation of internal rock mass of combination zone,stress concentration of southern boundary fault.Its impacts on railway engineering mainly include strong compression deformation of internal rock mass of combination zone,activity of southern boundary fault and high ground stress.The north part of combination zone is Gandise massif,which is an ideal area for railway engineering.

引文

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