藏东南高山峡谷区冰水堆积物塌岸预测方法选择  

Selection of Methods for Predicting Bank Collapse of Ice-Water Accumulations in Alpine Canyon Area of Southeast Tibet

作　　者：王群 李征征[1] 王璋 范文东 格桑欧珠 WANG Qun;LI Zhengzheng;WANG Zhang;FAN Wendong;Ge Sangouzhu(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;Geological Team,Bureau of Geology and Mineral Exploration and Development,Lhasa 850000,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]西藏自治区地质矿产勘查开发局第二地质大队,拉萨850000

出　　处：《西北水电》2024年第4期89-98,161,共11页Northwest Hydropower

基　　金：国家重点研发计划(2017YFC1501002);四川省教育厅重点科研项目(18ZA0045)。

摘　　要：由于冰川强大的搬运能力和较短的堆积路径,冰水堆积物易产生结构性脆弱破坏,黏聚力快速衰减。因此,冰水堆积物受外力影响下的库岸边坡稳定问题与传统地层有较大的差异,不能直接采用现有塌岸预测方法进行库岸边坡计算。以西藏某水电工程的库岸边坡为对象,通过现场试验、数值模拟等方法,分析采用不同塌岸计算方法在冰水堆积物计算中的准确性。结果表明:两段法和冲堆平衡法的计算结果相差了3倍(分别为620万m^(3)和218万m^(3)),冲堆平衡法预测结果更接近蓄水后的真实塌岸情况;库区不稳定坡体的塌岸方量为233万m^(3),与冲堆平衡法塌岸预测结果接近。因此,冲堆平衡法基本满足冰水堆积物水库塌岸的计算要求,可为高山峡谷区水库岸坡设计和治理提供借鉴。Due to the strong carrying capacity of glaciers and the short accumulation path,ice-water deposits are prone to structural fragility and rapid attenuation of cohesion.Therefore,the stability of the reservoir bank slope under the influence of external forces of ice-water deposits is quite different from that of traditional strata,and the existing bank collapse prediction method cannot be directly applied for the calculation of the reservoir bank slope.Taking the reservoir bank slope of a hydropower project in Tibet as the object,the accuracy of different bank collapse calculation methods in the calculation of ice-water deposits is analyzed through field tests,numerical simulation and other methods.The results show that the calculation results of the two-stage method and the flush-pile balance method differ by 3 times(6.2 million m^(3) and 2.18 million m^(3) respectively),and the prediction results of the flush-pile balance method are closer to the actual bank collapse volume after water storage;the bank collapse volume of the unstable slope in the reservoir area is 2.33 million m^(3),which is close to the prediction result of bank collapse volume by the flush-pile balance method.Therefore,the flush-pile balance method meets the calculation requirements of bank collapse of ice-water deposit reservoirs,and can provide reference for the design and management of reservoir slopes in mountainous canyon areas.

关 键 词：冰水堆积物 塌岸预测 通用两段法 简化冲堆平衡法 稳定分析 

分 类 号：P642.4[天文地球—工程地质学]