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“5.12”汶川地震触发了大量地质灾害,同时形成了大量震裂松动岩体,这些岩体除受控于自身节理裂隙和结构面,还受控于地震裂缝。极震区软岩崩塌十分发育,震裂斜坡岩体损伤大,借助西部交通科技项目和国家自然科学基金展开了对软岩崩塌的研究。基于对区域工程地质条件和震裂软岩裂隙和结构面组合的调查,阐述了崩塌危岩体的变形特征,进而采用赤平投影法和UDEC数值模拟对其成因机制和破坏模式进行了分析,在危岩体稳定性评价的基础上给出了防治措施建议。
“5.12 ” Wenchuan earthquake triggered a large number of geological disasters, while forming a large number of seismic loose rock mass, the rock mass in addition to being controlled by their own joint fissures and structural planes, but also controlled by seismic fractures. Soft rock avalanches in very earthquake zone are well developed and the damage of rock mass in the earthquake-ruptured slope is large. With the help of the western transportation science and technology project and the National Natural Science Foundation of China, the research on the soft rock collapse is carried out. Based on the investigation of regional engineering geological conditions and the combination of fractured soft rock fractures and structural planes, the deformation characteristics of collapsed rock mass are expounded, and the formation mechanism and failure mode of the collapsed rock mass are analyzed with the help of the stereographic projection method and UDEC numerical simulation. Based on the evaluation of the stability of dangerous rock mass, some preventive measures are given.