The nearly horizontal red beds are widely distributed in the form of sand-mudstone interbeds in the Sichuan Basin,which is prone to collapse under tectonic and weathering forces.Four research areas were selected based on the principle of decentralized layout in the red beds'distribution area to measure the sandstone layers'thickness,joint spacing and dip angle.Furthermore,the dimension characteristics on the three-dimensional scale of the collapse rocks in the area were investigated.The corresponding relationship was studied between the surveyed parameters with joint spacing and layer thickness.The analysis revealed that a significant positive correlation approximately meets the ratio of 1∶1 between the thickness and the developed joint spacing of the low-dip sandstone layers.Combined with the deduction that joint spacing is the main control factor of collapse rocks'dimension,the calculation method of the collapse rock volume by layer thickness was obtained.The judgmet basis of rock fall hazard prediction of near-horizontal red layer is put forward.
关键词
盆地岩体/小倾角/崩塌落石/节理间距/块径特征/灾害预测
Key words
basin rock mass/small dip angle/collapse rocks/joint spacing/dimension characteristics/hazard prediction
维普
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