| dangerous rock is one of the type disaster of natural geological in the mountain areas in China. Especially along the roads, railways, rivers and urban areas, villages and other residential areas, the disaster always caused traffic disruption, blocking waterways, threatening life and property safety. As the development of the economic construction and the deepening process of urbanization, the destruction of the deformation mechanism and the control measures on the dangerous rock is showing the importance and urgency.In this paper, it studies on the Dangerous rock at Wang Xia, Wushan County, Chongqing City, China. A in-depth research paid on the deformation damage mechanisms and stability with a numerical simulation, then obtain the design and control measures proposed. The main achievements as following:(1) The Wang Xia dangerous rock is at nearly the Nuclear of the Heng Shixi Anticline, Flat terrain. Cut by the fissures, the dangerous rock formation of a large plate or cylindrical shape. The lithology of the dangerous rock is Thin to medium thick layer of chert siliceous argillaceous limestone, under that there are the Shale, siltstone, claystone coal line. It is the Hard rock on the slope of soft structure. So that it pressure-shear weak base by the gravity, the Tension cracks generated in the upper rock. The cracks tracks Bottom-up, development of fissures, through to the top. Cracks in the rock cliffs on the formation of cutting a number of independent rock column and block, a dangerous single rock formed.(2) Failure mode of the dangerous rock is located sliding. By the impact of gob and karst collapse, the weak base and the underlying coal seam which is at the foot of the diff are pressured, Rock fracture tracing the development of fissures, the heart weight shift backwards and the dangerous rock pedestal sinked and extrusion.(3) under the influence of the rain or vibration, The part of dangerous rock W2-1A, B which has been the disintegrated may occur a slip again. It is temporarily in stable. There is No slip occurred of the W2-1C. There may be a further damage the deformation instability to W2-2. There is a strong deformation rock slope under the dangerous rock. The rock avalanche is orderlessly piled up on the loose slope as a block or board, and continue rolling to the bottom of the slip slope. It is a Poor stability of the slope. A large avalanche of rock and soil is accumulated on the foot of second cliffs. Currently, it is in a stable state for fragments of stone deposited on the slope. Case of rain, it is easy to form debris flows or overland flow.(4) As the morphology and stability of the dangerous rock conditions change greatly, the pre-dangerous rock control management can not be continue. This issue should pay close attention to the poor stability of the W2-2, W2-1A B district dangerous rock block for emergency. After completion of the dangerous rock remove construction, it wil be the supporting and the drainage measures on the rear mather rock, and the implementation measures for the spoil and colluvial objects on the slope which is under the dangerous rock. |
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