Rock avalanches are generally difficult to prevent and control due to their high velocities and the extensive destruction they cause.However,barrier structures constructed along the path of a rock avalanche can partia...Rock avalanches are generally difficult to prevent and control due to their high velocities and the extensive destruction they cause.However,barrier structures constructed along the path of a rock avalanche can partially mitigate the magnitudes and consequences of such catastrophic events.We selected a rock avalanche in Nayong County,Guizhou Province,China as a case to study the effect of the location and height of a retaining wall on the dynamic characteristics of rock avalanche by using both actual terrain-based laboratory-model tests and coupled PFC3D-FLAC3D numerical simulations.Our findings demonstrate that a retaining wall can largely block a rock avalanche and its protective efficacy is significantly influenced by the integrity of the retaining wall.Coupled numerical simulation can serve as a powerful tool for analyzing the interaction between a rock avalanche and a retaining wall,facilitating precise observations of its deformation and destruction.The impact-curve characteristics of the retaining wall depend upon whether or not the rock avalanche-induced destruction is taken into account.The location of the retaining wall exerts a greater influence on the outcome compared to the height and materials of the retaining wall,while implementing a stepped retaining-wall pattern in accordance with the terrain demonstrates optimal efficacy in controlling rock avalanche.展开更多
泥石流灾害是较常见且频发的地质灾害之一,常造成大量人员伤亡和财产损失。以空心寨沟泥石流为例,采用地面调查、室内试验、现场试验、定性分析及定量评价相结合的方法,分析了泥石流的基本特征,确定了相关的动力学参数,揭示了泥石流的...泥石流灾害是较常见且频发的地质灾害之一,常造成大量人员伤亡和财产损失。以空心寨沟泥石流为例,采用地面调查、室内试验、现场试验、定性分析及定量评价相结合的方法,分析了泥石流的基本特征,确定了相关的动力学参数,揭示了泥石流的形成规律及灾变机制。研究结果表明,空心寨沟泥石流为中频—暴雨—崩塌—滑坡—沟谷型黏性泥石流,目前处于壮年期,计算暴雨频率在P=5%条件下空心寨沟泥石流的平均流速为6.91 m/s,峰值流量达142.58 m 3/s,其中一次泥石流冲出流体总量为2.9104×104 m 3,冲出固体总量为1.5875×104 m 3。研究结果为制定空心寨沟泥石流灾害防治措施提供了重要依据。展开更多
基金Hunan Provincial key Laboratory of key Technology on Hydropower Development Open Research Fund (PKLHD202203)
文摘Rock avalanches are generally difficult to prevent and control due to their high velocities and the extensive destruction they cause.However,barrier structures constructed along the path of a rock avalanche can partially mitigate the magnitudes and consequences of such catastrophic events.We selected a rock avalanche in Nayong County,Guizhou Province,China as a case to study the effect of the location and height of a retaining wall on the dynamic characteristics of rock avalanche by using both actual terrain-based laboratory-model tests and coupled PFC3D-FLAC3D numerical simulations.Our findings demonstrate that a retaining wall can largely block a rock avalanche and its protective efficacy is significantly influenced by the integrity of the retaining wall.Coupled numerical simulation can serve as a powerful tool for analyzing the interaction between a rock avalanche and a retaining wall,facilitating precise observations of its deformation and destruction.The impact-curve characteristics of the retaining wall depend upon whether or not the rock avalanche-induced destruction is taken into account.The location of the retaining wall exerts a greater influence on the outcome compared to the height and materials of the retaining wall,while implementing a stepped retaining-wall pattern in accordance with the terrain demonstrates optimal efficacy in controlling rock avalanche.
文摘泥石流灾害是较常见且频发的地质灾害之一,常造成大量人员伤亡和财产损失。以空心寨沟泥石流为例,采用地面调查、室内试验、现场试验、定性分析及定量评价相结合的方法,分析了泥石流的基本特征,确定了相关的动力学参数,揭示了泥石流的形成规律及灾变机制。研究结果表明,空心寨沟泥石流为中频—暴雨—崩塌—滑坡—沟谷型黏性泥石流,目前处于壮年期,计算暴雨频率在P=5%条件下空心寨沟泥石流的平均流速为6.91 m/s,峰值流量达142.58 m 3/s,其中一次泥石流冲出流体总量为2.9104×104 m 3,冲出固体总量为1.5875×104 m 3。研究结果为制定空心寨沟泥石流灾害防治措施提供了重要依据。
