深埋长隧洞勘察阶段高地应力研究的技术路线探讨

Discussion on Technology Roadmap in Study on High Crustal Stress for Deep Burial and Long Tunnels at Exploration Stage

深埋长隧洞地应力的测试工作目前以隧洞深埋段布置勘探钻孔,并在孔内进行原位测试为主,往往投入的工作量大,费用高、但效率低,且无法全面反应工程沿线地应力分布情况。针对上述问题,通过在深埋长隧洞勘察阶段对区域地形、地层及地质构造进行分析及遥感解译工作的基础上,布置StratagemMT和使用天然面波法,并采用地球物理勘探反演与孔内测试相结合的地应力与电阻率比以及剪切波速比的相关数学模型的技术路线,分析了物探勘察解译的重点调查区地应力的分布规律。结果表明,按上述技术路线对深埋长隧洞勘察阶段高地应力的研究,可较全面地对工程沿线地应力进行有效评价,提高了工作效率,降低了勘察费用。

At present,the work testing crustal stress for deep burial and long tunnels is mainly laying exploration drilling hole along deep burial parts of the tunnel,and carrying out original position testing in the holes.Doing like this,usually the workload inputting is great,the cost is high,but the efficiency is low,and there is no way showing comprehensively conditions about crustal stress distribution along the project.Aiming at the problems said above,the authors,on the foundation of analyzing and interpreting in a way of remote sensing terrain,stratum and geological structure in the region at exploration stage for deep burial parts of the tunnel,laid Stratagem MT and natural surface wave method,used geophysical exploration inversion combing with testing in the holes as well as the relative mathematical model including the ratio of the crustal stress and resistivity and shear wave velocity ratio technology roadmap,and analyzed distribution laws of the crustal stress in the regions as key investigating in geophysical exploration interpretation.The results show that according to technology roadmap said above,studying high crustal stress for deep burial and long tunnels at exploration stage can relatively comprehensively,effectively carry out evaluating the crustal stress along the project,improve work efficiency,and reduce exploration cost.