摘要
针对高地应力强风化炭质板岩地层节理裂隙发育、围岩破碎,隧道施工过程中大变形灾害突出等问题,开展了围岩应力超前控制措施的现场试验研究。研究结果表明,常规支护措施无法有效解决高地应力强风化炭质板岩隧道的大变形问题,采用超前应力控制措施可以有效减小隧道的围岩变形,同时降低隧道钢架应力及围岩应力。相较于采用常规措施的对比段,进行超前钻孔和超前导洞试验段的水平收敛终值分别是152.93 mm和149.22 mm,降低了27.95%和29.70%;拱顶沉降终值分别是24 mm和15 mm,降低了61.29%和75.81%;钢架应力最大值分别是-143 MPa和-157 MPa,降低了23.12%和20.28%;围岩应力最大值分别是0.379 MPa和0.406 MPa,降低了77.44%和75.84%。
In view of the various problems caused by seriously weathered carbonaceous slate strata with high geostress,such as the development of joints and fractures,the fracture of the surrounding rock,and prominent large deformation hazards during the tunnelling process,this paper carries out a field test study on the advanced control measures for surrounding rock stress.The results show that conventional support measures cannot effectively solve the large deformation problem encountered by tunnels built in seriously-weathered carbonaceous slate with high geostress,and the use of advanced control measures for geostresses can effectively reduce the surrounding rock deformation of a tunnel while reducing the stress in the tunnel steel frame and surrounding rock.In contrast to the control section using conventional measures,the final values of horizontal convergence in the advanced borehole and pilot tunnel test sections are 152.93 mm and 149.22 mm,respectively,with a decrease of 27.95%and 29.70%;the final values of the crown settlement are 24 mm and 15 mm respectively,with a decrease of 61.29%and 75.81%;the maximum values of the steel frame stress are-143 MPa and-157 MPa,respectively,with a decrease of 23.12%and20.28%;and the maximum values of the surrounding rock stress are 0.379 MPa and 0.406 MPa,respectively,with a decrease of 77.44%and 75.84%.
作者
崔光耀
魏杭杭
王明胜
CUI Guangyao;WEI Hanghang;WANG Mingsheng(School of Civil Engineering,North China University of Technology,Beijing 100144;China Railway City Development and Investment Group Co.,Ltd.,Chengdu 610218)
出处
《现代隧道技术》
CSCD
北大核心
2022年第3期183-189,200,共8页
Modern Tunnelling Technology
基金
国家自然科学基金(52178378)
北京市青年拔尖人才培育计划(CIT&TCD201704013)
中铁隧道集团科技创新计划项目(隧研合2018-05).
关键词
隧道工程
高地应力
炭质板岩
应力控制
大变形
现场试验
Tunnel engineering
High geostress
Carbonaceous slate
Stress control
Large deformation
Field test
