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| Research on the Stress Deformation and Engineering Effect of the Lancangjiang Fault in Sichuan - Tibet Railway |
| LI Yu - sheng1，YI Shu - jian1，JIANG Liang - :en2，MAO Bang - yan2，HUANG Chao1，LIU Kai1 |
| (1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection， Chengdu University of Technology， Chengdu，Sichuan 610059，China;2. China Railway Eryuan Engineering Group Co. Ltd ，Chengdu，Sichuan 610031， China) |
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Abstract Research purposes ： Tectonic dynamic problems of the Lancangjiang fault such as activity characters and stress - deformation characteristics of crustal rock mass，greatly influence and restrict Sichuan - Tibet Railway engineering. Through field investigation and research of the fault geological formations - structural features， and combining with regional geophysical fields and the deep structure information， the authors have established the geomechanics conceptual model of the fault zone crustal structure. On this basis， we use ANSYS finite element numerical simulation metliod，to analyze stress deformation field characteristics of tlie fault crustal rock mass and explore its engineerng effect problems. Research conclusions ：( 1) The Lancangjiang fault mainly shows the characterstic of strong press - thrst，and cnstal rock compressive deformation. (2) Transfer of crustal stress and deformation is cut off by the fault and magmatic rocks on the west side，and makes stress and deformation intensity of both sides differ. (3 ) Two horzontal weak rock belts in the deep cmst， which drive the upper geological bodies to eastward migration，is the main dynamic factor affecting the regional tectonic movement. (4 ) The fault zone infuences in railway engineering mainly include compressive deformation of rock mass and high geostress problem in tunnel engineering of tlie west side magmatic rock mass. ( 5 ) The research results are mainly applied to the geological route selection and design optimization of Changdu to Basu in SLhuan - Til)et Railway.
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Received: 29 January 2016
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2016, Vol. 33 
