深埋长隧洞软岩工程地质特性及变形预测研究

Study on engineering geological characteristics and deformation prediction of soft rock in deep-buried long tunnel

滇中引水工程香炉山深埋长隧洞穿越软岩(含断层破碎带)时,在高地应力和富水条件下易产生围岩大变形,变形量可达数十厘米到数米,如不及时支护或支护不当,不但给工程建设带来极大困难,而且整治费用高昂,同时会严重影响工期、延滞总体工程进度。根据软岩工程地质特性、软岩大变形分析评价方法、数值模拟结果对香炉山深埋长隧洞进行了软岩挤压大变形分析预测,提出了处理措施建议,避免了软岩大变形可能造成的危害。研究成果可为类似深埋长隧洞工程提供一定的借鉴。

When crossing the soft rock(including fault fracture zone),surrounding rock of Xianglushan deep-bur⁃ied long tunnels of Central Yunnan Water Diversion Project are prone to large deformation under the condition of high ground stress and rich water,and the deformation can reach tens of centimeters to several meters.If the sup⁃port is not timely or is improper,there will be great difficulty for engineering construction,and the treatment will be costly.At the same time,it will seriously affect the construction scheme for a project and delay the overall progress of the project.Based on the engineering geological characteristics of soft rocks,large deformation analysis and eval⁃uation method for soft rocks,and the numerical simulation analysis results,the large soft rock extrusion deforma⁃tion prediction is analyzed for Xianglushan deep-buried long tunnel.The treatment measures are proposed to avoid potential hazards caused by large soft rock deformation.The research results can be a reference for similar deep bur⁃ied long tunnel engineering.