摘要
基于何家梁软岩隧道的工程地质条件与三维水压致裂地应力测试方法,测量并分析了工程区地应力分布规律,并采用FLAC3D数值分析软件对隧道开挖稳定性进行了评价。结果表明:自重应力是该地应力场中的主要影响因素,测区应力场为高应力水平,隧道开挖后,边墙中上部及拱顶有不同程度的下沉,周边位移相对值仍在规范允许范围之内。测试及数值分析结果可为工程区隧道开挖的稳定性分析及安全支护提供参考,可对类似软岩隧道的地应力测试及分析提供借鉴。
Based on the engineering geological conditions of Hejialiang tunnel in soft rock mass and the 3D hydro - fracturing test, the distribution law of in - situ stress in the engineering area was measured and analyzed, and the stability assessment on the surrounding rock mass after excavation was also carried out by FLAC3D. The results show that： gravity stress is the main influen- tial factor of the in - situ stress field ; the stress field of the test area is at high stress level; after tunnel excavated, the central and upper part of the side wall and the vault have different degrees of settlement, and the relative displacement of the surrounding area is still within the scope of the specification. The results of test and numerical analysis provide reference for stability analysis and safety support of tunnel excavation in the engineering area, as well as the in - situ stress measurement and analysis of similar soft rock tunnel.
作者
杨宗宝
白银
尹健民
张新辉
YANG Zongbao BAI Yin YIN Jianmin ZHANG Xinhui(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, China Hangzhou Company of China Railway Tunnel Group Co. , Ltd. , Hangzhou 310030, China)
出处
《人民长江》
北大核心
2017年第6期52-56,共5页
Yangtze River
基金
国家重点研发计划(2016YFC0401801)
国家自然科学基金项目(51204025)
中央级公益性科研院所基金项目(CKSF2013033
CKSF2014064YT
CKSF2015040/YT)
关键词
软岩
三孔交汇水压致裂法
地应力
开挖稳定性
何家梁隧道
soft rock
3D hydro- fracturing test
in- situ stress
stability of excavation
Hejialiang tunnel
