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对影响滚石的岩性、地形坡高和地质结构等因素进行现场地质调查和分析,初步确定存在潜在滚石的坡体。借助BJSD-2B型激光断面仪,选取上述坡体的4个典型剖面进行坡形测量。结合数值分析结果,确定块石A~F发生滚石的可能性较大。现场测量确定A~F块石的体积。在此基础上,利用Rocfall模拟软件对6块块石滚落的运动特征(运动距离、弹跳高度、动能和运动速度)进行预测和分析。结果表明:块石D的失稳对游客的生命安全威胁相对较小,但会直接导致7号洞洞室发生严重破坏;其余5块块石的失稳均会对游人的生命安全造成重大威胁,但不会严重影响到相应洞室的稳定。建议对上述6块块石所在坡体的关键部位及时采取工程措施进行加固。
On-site geological investigation and analysis of the lithology, topography slope height, geological structure and other factors that affect the rock, preliminary determine the existence of potential rock slope. With BJSD-2B laser profilometer, four typical sections of the slope were selected for slope measurement. Combined with the numerical analysis results, it is more likely to determine the occurrence of stones in blocks A ~ F. Field measurements to determine the volume of A ~ F block stone. On this basis, the Rocfall simulation software was used to predict and analyze the motion characteristics (moving distance, bouncing height, kinetic energy and moving velocity) of 6 blocks of rock mass. The results show that the instability of rock block D has a relatively small threat to the life safety of tourists, but it will directly lead to serious damage to tunnel caverns in Block 7. The other five stones will cause serious threats to the lives and safety of tourists. , But will not seriously affect the stability of the corresponding chamber. It is suggested to take timely engineering measures to reinforce the key parts of the slope where the above six blocks are located.