滑坡涌浪下斜坡波压力经验估算方法的对比

斜坡波压力计算公式经验性较强,计算公式种类繁多。为了探讨经验公式在预测滑坡涌浪对斜坡作用力的适用性问题,构建几何比尺为1∶70的滑坡涌浪三维物理模型,试验研究了不同工况时滑坡涌浪最大波与有效波下斜坡作用力的变化规律,采用3种常用的斜坡波压力经验公式,对比分析了滑坡涌浪下滑坡入水点正对岸斜坡波压力大小、作用点位置及分布特性。结果表明,3种经验公式计算结果有较大的差异,基于试验结果,路基公式经修正后可用于预测滑坡涌浪下斜坡波压力大小;向金公式经修正后可用于预测滑坡涌浪破碎作用点位置;波压力在斜坡上的分布趋势与苏联公式是一致的。

Comparison and analysis of empirical estimation methods for slope wave pressure under landslide-generated impulse wave

The slo pe w ave pressur e calculation is hig hly empirical and has a w ide variety o f calculatio n fo rmulas. In order to ex2 plo re the applicability o f empirical fo rmulas in pr edicting t he pressur e o f landslide2g ener ated impulse w ave on the slo pe, we con2 str ucted a three2dimensio nal phy sical mo del of landslide2generated impulse w ave w ith a g eometric scale o f 1: 70. We studied the variatio n law o f slo pe wav e pressur e under the maximum and the effectiv e landslide2g ener ated impulse w aves under differ ent wo rking conditio ns. Three commo nly used empirical fo rmulas for slope w ave pressur e w ere used for comparison and analysis of the mag nitude, action po int positio n, and distributio n char acteristics of the pressur e of landslide2g ener ated impulse w ave o n the slope that was directly o pposit e the w ater entry point of the landslide. The r esults show ed that the results o f the three empirical formulas w ere quite different. Accor ding t o t he test r esults, the modified Subgr ade Fo rmula can be used to predict t he magnitude of the slo pe w ave pr essure under landslide2generated impulse w ave; the modified Fo rmula can be used to predict the br eaking point position of landslide2generated impulse w ave; the distribution t rend of the w ave pressur e o n the slo pe is consist2 ent w ith the So viet Standard Formula.