程儿山隧道第三系砂岩施工地质问题研究

针对新建铁路原州区至王洼线程儿山长隧道工程通过第三系砂岩时出现的施工地质问题,在全面分析隧道区域地质、工程地质、水文地质条件的基础上,比拟在建兰渝线条件相近隧道工程、结合我国隧道勘察、设计现状和取样试验资料,深入分析第三系砂岩的工程特性,叙述砂岩黏粒含量、易溶盐含量2个因素对砂岩工程性质的控制作用和两者与含水率的关系,对地下水对砂岩稳定性影响及作用机理进行深入研究,针对性地提出工程处理措施,为隧道设计提供依据,为在第三系砂岩中的隧道施工安全奠定了基础。

Research on Geological Problems during Construction in Tertiary Sandstones Section of Chengershan Tunnel

Aiming at the geological problems during construction in tertiary sandstone section of Chengershan Tunnel on newly-built railway from Yuanzhou to Wangwa,on the basis of a comprehensive analysis of regional geology,engineering geology and hydrogeology conditions about this tunnel,in comparison with those tunnel projects having similar conditions on Lanzhou-Chongqing Railway which was being constructed,in combination with China's tunnel survey and design situations and the sampling test data,the author conducted an in-depth analysis on the engineering characteristics of tertiary sandstones.Then,the author illustrated the two factors of sandstones including the clay content and soluble salt content,which will exert control effect on sandstone engineering property and are related to water content.Furthermore,after deeply studying the impact of groundwater on sandstone stability and mechanism of action,the author put forward the targeted engineering measures.It provides reference for the design of the tunnel,laying foundation for the safety of tunnel constructed in tertiary sandstones.