基于修正的两段法对某电站水库松散堆积体岸坡塌岸预测

水库塌岸是影响水电站库区移民工程的重要地质灾害问题,研究其塌岸模式、预测方法并预测最终塌岸宽度是十分必要的。通过对某水电站库区重点库段塌岸进行调查分析,该水电站库区塌岸模式以冲蚀磨蚀型和坍塌型为主;分析几种常用的塌岸预测方法,确定采用修正后的两段法预测该库区塌岸最终宽度;采用现场工程地质调查法、工程类比法等手段确定了库区塌岸预测参数,并对该水电站库区塌岸进行了预测,预测结果表明库区塌岸总长30.5km,塌岸预测最终宽度为5~50m。该研究可为库区移民工程提供重要依据。

Bank Collapse Prediction of the Loose Accumulation in a Hydropower Station Reservoir Based on the Modified Two-Section Method

Reservoir bank collapse is one of the most severe geological disasters,which influences the immi-gration engineering in the reservoir of hydropower stations.Therefore,it is necessary to study the types and forecasting methods of bank collapse and obtain the final width of bank collapse.Through investigating the geology about bank collapsing of the key segments of a hydropower station reservoir,this paper finds two main bank-collapsing types,namely,the wash and abrasion type,and the collapse sliding type.Then,the pa-per analyzes some common methods of forecasting bank collapse and determines to use the modified two-section method to predict the final width of bank collapse.With the methods of field survey and engineering analogy,the paper also ascertains the forecasting parameters.Finally,the results of bank collapse forecas-ting show that the total length of bank collapse is 30.5 km and the final width is 5~50m,which provides an important basis for the immigration engineering of the reservior.