摘要
为保证超小净距近接交叉隧道施工安全,以盘道岭隧道交叉施工段为研究对象,提出交叉隧道施工优化支护方案。基于超前地质预报方法和围岩地质评级系统,提出交叉隧道节理岩体的地质强度指标(GSI)。采用Hoek-Brown强度准则峰后应变软化模型及数值计算方法,研究下行隧道施工过程中围岩位移场的变化特性。结果表明:数值计算得到的下行隧道拱顶变形量与现场实测结果相吻合;根据现场实测数据分析下行隧道拱顶下沉量和支护压力的相互作用关系可知,用优化支护方案能够保证交叉隧道施工的安全稳定性,数值计算能反映现场的实际情况。
In order to ensure the safety of super small clear distance crossing tunnels construction, the crossing tunnels construction section of Pandaoling tunnel in Dandong was taken as an object of study, and an optimal supporting scheme was developed for crossing tunnels construction. Based on an advanced geological prediction method and rating system of surrounding rock, geological strength indexes were determined for the crossing tunnel jointed rock mass. Hoek-Brown strength criterion post-peak strain softening model and a numerical method were used to study the variation characteristics of displacement field in the process of downlink tunnel construction. Research results indicate that the downlink tunnel vault deformation obtained by numerical calculation coincides with measured results, that the optimal support scheme ensures the safety and stability of crossing tunnel construction by monitoring downlink tunnel vault settlement and support pressure, and that the results of numerical calculation reflects the actual situation on the construction site.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2016年第6期141-145,共5页
China Safety Science Journal
基金
国家自然科学基金资助(51174268
51274109)
