水压致裂法在长大隧道地应力测试中的应用研究
Research on the Application of Hydraulic Fracturing Method in Crustal Stress Test of Long and Large Tunnel
马玉杰1
作者信息
- 1. 西安中交公路岩土工程有限责任公司,陕西 西安 710054
- 折叠
摘要
文章以某新建高原隧道为研究对象,采用水压致裂法,测试地层原位地应力的大小和方向,确定隧道围岩的地应力状态.结果表明,隧道岩层不属于典型硬脆岩质,初步预测该隧道不存在典型岩爆,以变形偏大、洞壁岩体偏薄及剥离为主表现形式;埋深为146～285 m和286～465 m时,围岩开挖可能分别出现Ⅰ级、轻微大变形及Ⅱ级、中等大变形.埋深＞335 m时,围岩开挖后处于高初始应力状态;埋深＞660 m时,甚至出现极高初始应力状态,建议隧道施工时早封闭、勤测量.
Abstract
A newly-built plateau tunnel is taken as the research object,and the magnitude and direction of in-situ crustal stress in the stratum are tested by hydraulic fracturing method to determine the crustal stress state of tunnel surrounding rocks.The results show that the rock stratum of the tunnel is not typical hard and brittle rock.It is preliminarily predicted that there will be no typical rock burst in the tunnel,which is mainly manifested by large deformation,wall rock deviation and peeling.When the buried depth is 146-285 m and 286-465 m,the surrounding rock excavation may experience grade I,slight large deformation and grade II,medium large deformation respectively.When the buried depth is more than 335 m,the surrounding rock is in a high initial stress state after excavation;when the buried depth is more than 660 m,even extremely high initial stress state may occur.It is suggested that the tunnel should be closed early and measured frequently during construction.
关键词
水压致裂法/长大隧道/地应力/围岩变形/岩爆Key words
hydraulic fracturing method/long and large tunnel/crustal stress/surrounding rock deformation/rock burst引用本文复制引用
出版年
2024
NETL
NSTL
万方数据