【摘要】 根据调查资料对西气东输二线工程1#隧道南口的地质安全进行分析评价.1#隧道工程地质安全隐患为进硐口的危岩崩塌、不稳定斜坡、弃渣边坡和围岩稳定性.对隧道围岩计算得出岩体强度应力比均大于6.该隧道围岩能够承受围岩应力的作用,不会产生过大的整体塑性变形、剪切及弯折等变形破坏,但围岩中体存在分离块松动坍塌的可能性.从预防、治理和监测3个方面提出对策建议.更多还原

【Abstract】 The security assessment of the southern entrance of tunnel No.1 on the pipeline project-Ⅱ of west-to-east gas transportation is to be performed on the basis of investigation data.There are hidden troubles of security such as some crag,rockfall,unstable slope,tunnel constructing dregs’s slop and adjoining rock stability in the entrance of tunnel No.1.It was found after computation that the strength-stress ratios of wall rocks were more than 6.The stress,plastic metamorphose,shearing,and flexure deformations that might take place would be within acceptable range.Nevertheless,it might be possible that some cohesionless stuff collapse in separated blocks of adjoining rock would happen.A helpful suggestion was provided in this paper in connection with their preventing,treating and monitoring.更多还原