多相土石复合介质推剪破坏电阻率响应特征试验研究

Experimental Study on Resistivity Response Characteristics of Push-Shear Failure of Multiphase Soil-Stone Composite Medium

为获得土石复合介质剪切破坏过程中电阻率的变化规律,分别建立土石质量比为4:6、5:5、7:3的模型,并在不同含水条件下进行推剪试验,得出不同模型在推剪力作用下电阻率变化的响应特征及破坏时的电阻率。试验表明:浸水条件下各模型剪切时的电阻率均较正常条件下低,且随土石质量比的减少模型初始电阻率增大,破坏过程中电阻率稳定阶段响应特征更加显著。不同土石质量比复合介质模型在剪切过程中电阻率的响应特征说明,不同土石质量比复合介质的响应差异性巨大,变化规律可为利用电阻率无损检测土石边坡滑动等提供可靠的数据支撑。

In order to obtain the change law of resistivity in the process of shear failure of soil-stone composite medium, the model of soil-stone mass ratio of 4 : 6, 5 : 5 and 7 : 3 is established respectively, and the push-shear test is carried out under different water-bearing conditions, and the response characteristics of the resistivity change and the resistivity of the failure under the action of push-shear force are obtained. The test results show that the resistivity of each model is lower in normal conditions under the immersion, and the initial resistivity of the model increases with the reduction of the mass ratio of soil and rock, and the response characteristics of stabilization stage of the resistivity are more significant during the failure process. The response characteristics of the resistivity of the composite medium model with different soil-stone mass ratios in the shear process show that the response of the composite medium model with different soil-stone mass ratios is greatly different, and the change law can provide reliable data support for the non-destructive detection of soil-stone slope sliding etc. by the resistivity.