九畹溪崩塌堆积体塌岸预测及对涌浪的影响分析
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摘要
三峡水库蓄水后库区涉水崩塌堆积体前缘会产生新的塌岸,进而对崩塌堆积体涌浪产生影响。为科学预测塌岸对崩塌堆积体涌浪灾害的影响,以三峡库区九畹溪崩塌堆积体为研究对象,通过工程地质调查,查明了其塌岸类型及其特征;运用岸坡结构法预测了崩塌堆积体的塌岸范围;采用改进条分法计算了塌岸前后崩塌堆积体运动速度;运用潘家铮法预测了塌岸前后九畹溪崩塌堆积体产生涌浪的初始高度,并对崩塌堆积体涌浪对岸点爬高进行了计算和对比。研究表明,三峡水库蓄水会导致九畹溪崩塌堆积体塌岸加剧,塌岸后崩塌堆积体初始涌浪高度及对岸点涌浪爬高会大幅度降低,表明塌岸减小了涌浪灾害的危害。
After the Three Gorges Reservoir impounded,the reservoir-related collapse accumulation's front would form new collapse,which will cause the surge in the reservoir. In order to scientifically forecast the influence of bank collapse on collapse accumulation stability and accumulation collapse on surge disasters,taking Jiuwanxi collapse accumulation as an example and based on the engineering geological investigation,we identify its bank collapse types and characteristics,analyze the bank collapse range of the collapse accumulation by applying bank slope structure prediction method,and calculate the collapse accumulation's movement velocity before and after bank collapse with the improved slices method,forecast the initial surge height before and after bank collapse by applying Panjiazheng method and the surge climbing height on the opposite bank. The research indicates that the impoundment of Three Gorges Reservoir will increase bank collapse risk of Jiuwanxi collapse accumulation,however,the initial surge height and climbing height on the opposite bank caused by accumulation collapse will decrease after bank collapse,and the harm of the surge disasters could be reduced.
After the Three Gorges Reservoir impounded,the reservoir-related collapse accumulation's front would form new collapse,which will cause the surge in the reservoir. In order to scientifically forecast the influence of bank collapse on collapse accumulation stability and accumulation collapse on surge disasters,taking Jiuwanxi collapse accumulation as an example and based on the engineering geological investigation,we identify its bank collapse types and characteristics,analyze the bank collapse range of the collapse accumulation by applying bank slope structure prediction method,and calculate the collapse accumulation's movement velocity before and after bank collapse with the improved slices method,forecast the initial surge height before and after bank collapse by applying Panjiazheng method and the surge climbing height on the opposite bank. The research indicates that the impoundment of Three Gorges Reservoir will increase bank collapse risk of Jiuwanxi collapse accumulation,however,the initial surge height and climbing height on the opposite bank caused by accumulation collapse will decrease after bank collapse,and the harm of the surge disasters could be reduced.
引文
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[2]张奇华,丁秀丽,张杰,等.三峡库区奉节河段库岸蓄水再造研究[J].岩石力学与工程学报,2002,21(7):1007-1012.
[3]吴益平,唐辉明,余宏明.三峡库区奉节县新址白马小区库岸再造工程地质研究[J].岩土力学,2003,24(增刊):361-364.
[4]G.史蒂瓦内拉.刘忠清译.滑坡引起波浪的估算[J].人民长江,1991,22(3):55-59.
[5]汪洋.水库库岸滑坡速度及其涌浪灾害研究[D].武汉:中国地质大学(武汉),2005.
[6]潘家铮.建筑物的抗滑稳定和滑坡分析[M].北京:水利出版社,1980.
[7]郭振,王刚,王世梅.三峡库区水库塌岸对滑坡稳定性影响分析[J].山西建筑,2016,43(3):44-46.
[8]阙金声.三峡工程涪陵区水库塌岸非线性预测研究[D].长春:吉林大学,2007.
[9]王伟.图解法预测水库塌岸方法比较[J].山西建筑,2007,12(36):350-353.
[10]许强,黄润秋,汤明高.山区河道型水库塌岸研究[M].北京:科学出版社,2009.
[11]王小东,戴福初.基于DEM的水位变幅带内稳定坡角的自动提取[J].地球科学-中国地质大学学报,2014,39(1):115-122.