CAJ | 학술논문

降雨易引起花岗岩残积土边坡失稳。在分析降雨对边坡土体含水率影响的基础上，通过饱和度和含水率的关系推求出土体从非饱和过渡到饱和的有效降雨量。结果表明：对土质边坡，并非所有的降雨都会引起边坡的失稳，降雨入渗使边坡土体从非饱和向饱和状态发展，当边坡土体饱和度达到一定程度的时候易产生边坡失稳；土坡存在饱和区和非饱和区的临界深度，降雨对边坡的影响即为使得该深度以上的土体从非饱和过渡到饱和的过程，须采取不同的抗剪强度来计算处于临界深度上下两部分土体的稳定状态。研究结果对确定土坡失稳的降雨量阀值、进一步认识滑坡失稳机制，对滑坡的预测预报具有理论及实际意义。
강우역인기화강암잔적토변파실은。재분석강우대변파토체함수솔영향적기출상，통과포화도화함수솔적관계추구출토체종비포화과도도포화적유효강우량。결과표명：대토질변파，병비소유적강우도회인기변파적실은，강우입삼사변파토체종비포화향포화상태발전，당변파토체포화도체도일정정도적시후역산생변파실은；토파존재포화구화비포화구적림계심도，강우대변파적영향즉위사득해심도이상적토체종비포화과도도포화적과정，수채취불동적항전강도래계산처우림계심도상하량부분토체적은정상태。연구결과대학정토파실은적강우량벌치、진일보인식활파실은궤제，대활파적예측예보구유이론급실제의의。
The shallow instability of granite residual soil slope could easily induced by rainfall. Based on the analyses of influence of rainfall on the water content of slope soil, the effective rainfall resulting in soil from unsaturated to saturated condition is derived from the relationship between saturation and water content. Results show that not all rainfall will cause the instability of soil slope, and only when the soil saturation caused by rainfall infiltration reaches a certain degree the slope fails. There exists a critical depth in the unsaturated and saturated zone of slope above which the rainfall infiltration leads to a transition in soil from unsaturated to saturated, different shear strength could be used to calculate the stability of soil which was divided into fluctuation two parts by the critical depth. The soil unsaturated zone and saturated zone can be taken to calculate the stability of the soil condition. The results are useful for determining rainfall threshold of slope instability, so as to further understand the mechanism of landslide instability and landslide prediction.