晋济高速K1071+250—450段高边坡危岩稳定性评价

Stability Evaluation of High Slope Dangerous Rock on K1071+250—450 Section of Jinji Expressway

晋济高速公路K1071+250—K1071+450段岩质高边坡因风化裂隙、节理裂隙、卸荷裂隙较发育等原因,形成陡崖和危岩体,严重影响公路运营安全,通过现场调查发现岩壁坡顶内卸荷裂隙极为发育,卸荷拉张裂缝最宽达0.2 m,稳定性差,极易发生崩塌落石。采用RocFall软件对危岩体进行稳定性分析,计算得到边坡潜在的落石弹跳高度4.1 m,落石总能量1 198 kJ,最大平移速度达37.8 m/s,破坏性极大。

Due to the development of weathering cracks, joint cracks and unloading cracks of high rock slope on K1071+250—450 section of Jinji Expressway, the steep cliffs and dangerous rock mass were formed,which seriously affected the safety of highway operation. Through the field investigation, it can be found that the unloading cracks were extremely developed in the the top of the rock slope, which had poor stability and was easy to collapse and fall rocks, and the maximum width of the unloading tensile crack was 0.2 m. The RocFall software was used to analyze the stability of dangerous rock mass. The calculation results of the rockfall showed that the potential jump height was 4.1 m, the total energy was 1 198 kJ, and the maximum translatory velocity was 37.8 m/s,and it can be seen that the rockfall was very destructive.