抄録
Among various types of chemical weathering, rainwater is playing a vital role in degradation of soft rock slopes affecting its geotechnical properties. Conducting laboratory tests every year to determine shear strength of widespread mountainous slopes is critical and expensive, thus, a necessity of an empirical relationship is realized. This paper presents a laboratory developed relationship between shear strength and shear wave velocity for the weathering of soft rocks. Acidic nature of rainwater is simulated by laboratory reproduced weathering process on artificial soft rocks made by silica sand, gypsum and CaCO3. Negative ageing effects on the geo-material by deterioration of binding minerals is elucidated from decreasing trends of shear strength and shear wave velocity. It is revealed that the more is the acid contents in rainwater, the more is the decomposition of soft rocks. Moreover, field tests were conducted to acknowledge a general profile of the weathered rock slope.
