Zhangmu Town in Tibet of China,which lies in the southern piedmont of the median Himalayas,is a small but strategically important port of trade exchange between China and Nepal.Many rockfall events have occurred in Zh...Zhangmu Town in Tibet of China,which lies in the southern piedmont of the median Himalayas,is a small but strategically important port of trade exchange between China and Nepal.Many rockfall events have occurred in Zhangmu since 1970,resulting in huge economic losses and serious influence on the bilateral trade.We conducted a detailed field investigation on the high and steep slope in Zhangmu Town,and analyzed the distribution features,stability,failure modes and evolution of dangerous rocks of potential rockfalls.Then we numerically simulated the movement path,velocity and accumulation forms of the rockfall with PFC^(3D) program.The results indicated that the dangerous rock belt could be divided into three sections,namely,unstable section,slightly stable section and basically stable section.It was estimated that the rock debris and single dangerous rock would be unstable in the case of earthquakes or rainstorms.Due to the terrain constraints,the fallen rocks would scatter near the mouth of the Zhangmu ditch and in the Buqu River through multiple times of rolling,collision-induced diversion and bouncing.Without reinforcement,the rockfall could cause serious damage to the car parks,gas stations and National Highway 318 along the line from Zhangmu Town to Zhangmu ditch.Based on the field survey and numerical simulation,we recommended rockfall removal and interception as the major prevention measures,and protective sheds as auxiliary measure.展开更多
针对目前边坡稳定性评价中单一赋权方法的缺陷和组合赋权法的不足,引入相似性度量评价,建立基于基尼系数法和超标加权法的组合权重优化方法,并运用TOPSIS(Technique for Order Preference by Similarity to Ideal Solution)对岩质边坡...针对目前边坡稳定性评价中单一赋权方法的缺陷和组合赋权法的不足,引入相似性度量评价,建立基于基尼系数法和超标加权法的组合权重优化方法,并运用TOPSIS(Technique for Order Preference by Similarity to Ideal Solution)对岩质边坡稳定性进行评价,构建了基于组合权重-TOPSIS的评价模型;以10个水电岩质边坡为例,选取单轴抗压强度、结构面间距、结构面特征、RQD、地下水条件、结构面方向指标、开挖方法、边坡高度为评价指标,建立等级标准,依据该模型得到岩质边坡稳定性评价结果,并与其他模型结果及边坡实际情况进行了对比验证。结果表明,构建模型所得结果与实际情况一致,优于其他模型结果,该评价模型合理可行,可用于岩质边坡稳定性评价。展开更多
基金the National Key Research and Development Program(Grant No.2019YFC1509704)National Natural Science Foundation of China(Grant No.U1704243)。
文摘Zhangmu Town in Tibet of China,which lies in the southern piedmont of the median Himalayas,is a small but strategically important port of trade exchange between China and Nepal.Many rockfall events have occurred in Zhangmu since 1970,resulting in huge economic losses and serious influence on the bilateral trade.We conducted a detailed field investigation on the high and steep slope in Zhangmu Town,and analyzed the distribution features,stability,failure modes and evolution of dangerous rocks of potential rockfalls.Then we numerically simulated the movement path,velocity and accumulation forms of the rockfall with PFC^(3D) program.The results indicated that the dangerous rock belt could be divided into three sections,namely,unstable section,slightly stable section and basically stable section.It was estimated that the rock debris and single dangerous rock would be unstable in the case of earthquakes or rainstorms.Due to the terrain constraints,the fallen rocks would scatter near the mouth of the Zhangmu ditch and in the Buqu River through multiple times of rolling,collision-induced diversion and bouncing.Without reinforcement,the rockfall could cause serious damage to the car parks,gas stations and National Highway 318 along the line from Zhangmu Town to Zhangmu ditch.Based on the field survey and numerical simulation,we recommended rockfall removal and interception as the major prevention measures,and protective sheds as auxiliary measure.
文摘针对目前边坡稳定性评价中单一赋权方法的缺陷和组合赋权法的不足,引入相似性度量评价,建立基于基尼系数法和超标加权法的组合权重优化方法,并运用TOPSIS(Technique for Order Preference by Similarity to Ideal Solution)对岩质边坡稳定性进行评价,构建了基于组合权重-TOPSIS的评价模型;以10个水电岩质边坡为例,选取单轴抗压强度、结构面间距、结构面特征、RQD、地下水条件、结构面方向指标、开挖方法、边坡高度为评价指标,建立等级标准,依据该模型得到岩质边坡稳定性评价结果,并与其他模型结果及边坡实际情况进行了对比验证。结果表明,构建模型所得结果与实际情况一致,优于其他模型结果,该评价模型合理可行,可用于岩质边坡稳定性评价。
