高应力软岩在铁路隧道施工中的工程地质特性探讨

Discussion on Engineering Geological Features of High Stress Soft Rock during Construction of Railway Tunnel

研究隧道高应力软岩的工程地质、变形机理、支护原理及支护结构的特性,寻求隧道设计和支护施工方案。以板岩为研究对象,通过施工编录、室内试验、物探PST、钻探、地应力测试和变形测量,从其岩石、岩体特征、岩体质量、地应力、围岩分级、施工变更、变形及破坏特点等方面进行探讨。总结出高地应力软岩在隧道施工中的工程地质特点、围岩变形、破坏规律、高应力和围岩级别的划分原则,明确了其地质条件的研究内容,给出解决隧道大变形、难支护问题的设计和支护对策。

Through research on the engineering geological features, deformation mechanism, supporting principle and the supporting structure for high stress soft rocks, the paper explores tunnel design and construction support schemes. Taking the slate as research object, by using constructional geological logging, laboratory test, geophysical prospecting PST, exploratory boring, ground stress testing and deformation measuring and other measures, the paper discusses several issues such as the rocks, rock features, rock mass quality, ground stress, surrounding rock classification, construction alteration, deformation and failure characteristics etc. Further, focusing on the high ground stress soft rock during tunnel construction, the paper summarizes the engineering geological features, surrounding rock deformation, failure lows, high stress and surrounding rock classification principles. Finally, after making clear the research content of other geological conditions, the paper proposes design and support solution measures for the tunnel suffering with large deformation and with difficulty on supporting measures.