不同水岩作用下板岩物理力学性质劣化实验研究

甘肃舟曲、武都地区是我国滑坡、泥石流等地质灾害发育最为密集、活动最为频繁的区域之一,该区广为出露的志留纪板岩的水岩劣化进程是滑坡、泥石流高度发育的主要原因之一。研究通过对经历不同次数饱水循环、干湿循环养护后板岩的宏观形态的观测,质量变化、弹性波速和单轴抗压强度的测试,对板岩在两种不同水岩作用方式下裂纹扩展过程、质量、波速和强度等相关指标的变化进行了对比研究,揭示了水岩作用方式下板岩的劣化规律,并初步探讨了板岩在不同水岩作用方式下的劣化机理,为滑坡、泥石流灾害的区划评价和防治提供有益的参考。

DRYING-WETTING -SATURATING EXPERIMENTS FOR DETERIORA-TION OF PHYSICAL AND MECHANICAL PROPERTIES OF SLATE

The region of Zhouqu and Wudu in Gansu province is one of the most intensive activities and the most frequent areas of geological disasters such as landslide and debris flow. The process of the water-rock interaction of the wide outcrop of Silurian slate in the area is one of the main reasons that the landslides and debris flow can highly develop. The paper observes the macro morphology and tests the variation of qualities in elastic wave velocity and uniaxial compressive strength of the slate samples after saturated cycles and wet and dry cycles in different times. It compares the process of crack propagations and the variations of quality, strength and such related indicators of slate sample under two kinds of water-rock interactions. The test results reveal the degradation law of slate under water-rock interaction. Preliminary discussions are given on the mechanism of degradation of slate under different water-rock interactions. The study provides a useful reference for evaluation and prevention of landslide and debris flow disasters.