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映秀隧洞进口段地处2008年“5.12”大地震的震源中心地带,“5.12”大地震产生的剧烈地层挤压、振动、剪切运动等,使岩层断裂带松散破碎加剧,节理裂隙进一步发育,裂隙变成断裂带,节理变成裂隙,闭合裂隙变成张性裂隙,嚼合裂隙变成错位裂隙等。由于洞口岩体极为破碎,构造节理极为发育,且边坡高陡,极易产生崩塌落石,容易造成明洞偏压,存在较大的安全隐患。针对这一技术难题,介绍明洞基础处理、明洞浇筑、洞门墙施工、抗滑桩桩基加固和明洞回填等关键技术,为类似工程施工提供借鉴。
The inlet section of Yingxiu Tunnel is located in the center of the epicenter of the 2008 5.12 earthquake and the severe formation extrusion, vibration and shearing caused by the May 12 earthquake have aggravated the loose fracture of the rock fracture zone. The joints Further development of fissures, fissures into a fracture zone, joints become cracks, closed fissures into tension cracks, chewing fissures into dislocation cracks. Due to the extremely broken rock mass at the mouth, the joints of the structure are extremely developed and the slope is steep and prone to collapsing and falling rocks, which will easily result in the bias of Myeong-dong and pose a great potential safety hazard. In response to this technical problem, key technologies such as the basic treatment at Myeong-dong, pouring at Myeongdong, construction of the doorway walls, reinforcement of anti-slide piles and backfilling of the Myeongdong are introduced to provide references for similar projects.