摘要
为研究软岩巷道的支护技术,确保巷道稳定和正常使用,采用X射线衍射荧光光谱仪对三水平回风石门围岩进行了岩性组分分析,应用钻孔探测方法测出了围岩松动圈范围和裂隙分布区域.针对围岩岩性、松动圈范围和巷道所处的应力环境等因素,支护形式确定为初次柔性支护即锚网喷支护与预应力锚索支护,二次支护用高强度支护即锚索与全断面锚注加固组成的复合支护结构.工程实践结果表明：支护1个月后,顶底板及两帮移近量在30~35 mm范围内;累计观测75 d后,顶底板和两帮移近量均控制在45 mm以内,围岩变形量较小,保证了巷道的稳定和正常使用.
For the study of supporting technology in soft rock tunnel and to ensure its stability and normal use, the X ray diffraction fluorescence spectrometer was applied to analyze lithologic composition of surrounding rock on the three levels of return air cross-hole, Borehole detecting method was applied as well to measure the surrounding rock loose circle and fissure distribution area. Based on lithology, loose circle range, stress environment etc., of surrounding rock roadway, the flexible supporting form（spray anchor net supporting and pre-stressed anchor cable） was determined to be adopted for the first time, the reinforcement of composite supporting structure（namely anchor cable and the whole section grouting） was for secondary support. The engineering practice results show that the floor and both sides rock shifting were controlled within 30 to 35 mm after a month and the 45 mm after 75 d by total observation accumulatively, and the surrounding rock deformation was small, which was guaranteed the stability of the roadway and formal use.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2014年第6期745-751,共7页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金资助项目(50974118)
江苏省高校优势学科平台建设资助项目(SZBF2001-6-B35)
关键词
软岩
巷道支护
X射线衍射光谱分析
强度实验
松动圈测试
锚网喷支护
锚索
全断面注浆
soft rock
roadway support
x-ray diffraction spectrum analysis
strength experiment
borehole detection
spray anchor net supporting
pre-stressed anchor cable
the whole section grouting
