滑坡自然电场物理模拟研究

Physical simulation study of natural electric field in landslides

为了厘清自然电位法监测中岩土种类、含水率、坡度角在滑坡产生前的响应规律,研究了各因素作用下模拟滑坡时自然电位曲线的变化特征,通过厘清单因素、多因素综合影响的前提下滑坡产生前后自然电位如何变化,总结出实验条件下滑坡的自然电位响应规律。结果表明,采用自然电位法预测滑坡时与其自然电位数值无关,只与自然电位变化率有关;不同岩土类型和坡度角在发生滑坡之前自然电位信号值会升高,升高速率越大发生滑坡的严重程度越高;不同含水率实验在滑坡产生之前自然电位信号值会降低,且滑动前自然电位信号降低速率越快发生滑坡的严重程度越高。

In order to clarify the response law of rock and soil types,moisture content,and slope angle in natural potential method monitoring before landslide occurrence,the variation characteristics of natural potential curves during simulated landslide under the action of various factors were studied.By analyzing the comprehensive influence of single factor and multiple factors,the natural potential response law of landslides before and after landslide occurrence was summarized under experimental conditions.The results show that when using the natural potential method to predict landslides,it is not related to its natural potential value,but only to the rate of natural potential change.Different rock and soil types and slope angles will cause an increase in the natural potential signal value before landslides occur,and the higher the rate of increase,the higher the severity of landslides.The natural potential signal value will decrease before the landslide occurs in experiments with different water contents,and the faster the natural potential signal decreases before sliding,the higher the severity of the landslide.