T2b^2地层隧道围岩的主要工程地质问题及特性——以郑万高铁(重庆段)为例

Main Engineering Geological Problems and Characteristics of Tunnel Surrounding Rock with T2b^2 Formation——Taking ZhengWan High-Speed Railway(Chongqing Section)as an Example

通过新建郑万高铁(重庆段)隧道的施工开挖揭示情况,对巴东组二段(T2b^2)的围岩遇到的主要工程地质问题进行了阐述,并通过室内实验及现场施工情况对巴东组二段(T2b^2)泥岩与侏罗系(J)红层泥岩的主要工程地质特性进行了对比分析,得出了二者之间的特性差异及巴东组二段(T2b^2)地层隧道围岩问题发生的原因,对正在施工以及后期新建铁路遇到类似地层的隧道围岩分级情况及设计措施有较强的指导意义和引导作用。

Through the construction and excavation of the new ZhengWan high-speed railway(Chongqing section)tunnel,the main engineering geological problems encountered in the surrounding rock of the second section of Padang formation(T2b^2)are expounded.The main engineering geological characteristics of mudstone in the second member of Padong formation(T2b^2)and Jurassic(J)red layer mudstone were compared and analyzed by laboratory experiments and field construction,the characteristic differences between the two and the root causes of surrounding rock problems in the second segment of the Padang formation(T2b^2)are obtained.It has a strong guiding significance and guiding effect on the classification and design measures of surrounding rock of tunnel with similar stratum in construction and later stage of new railway construction.