灰岩-粉质黏土混合填料原位水平推剪试验研究

土石混合料是由土和岩块（碎石）组成的复合体。混合料中土的种类不同，岩块的种类及含量不同，剪切破坏特征亦不同，由于对它的剪切破坏机理研究还不够深入，在工程中难以确定这类填料的强度参数。为进一步探明土石混合填料的剪切破坏特征，对灰岩-粉质黏土混合填料进行了5个原位大型水平推剪试验。根据现场试验结果，将这类土石混合填料的水平推力-位移曲线划分为5个阶段，并对各个剪切破坏面进行三维还原。

Horizontal Push-shear In-situ Test Study on Limestone-silty Mixture

Rock-soil aggregate is a complex made of soil and rock (broken stone), wherein the variety and content of soil and rock are different, hence the shear failure characteristics are not the same as well. However, the study on the shear failure mechanism is not deep enough so that the strength parameter of such filler is hard to determined in the engineering. To further verify the shear failure characteristics of the soil-rock mixture, 5 large-scale horizontal push-shear in-situ tests were carried out on limestone-silty clay filler. According to the result of the field tests, the horizontal thrust-displacement curve of such mixed filler was divided into 5 stages, and each shear failure surface was restored in three dimensions.