CAJ | 학술논문

基于三峡库区实测降雨资料，研究了不同初始条件对不同土体边坡稳定性影响，建议了能够反映边坡含水状态的初始条件选取方法。在此基础上，采用非饱和渗流分析方法研究了前期降雨对不同土体边坡稳定性影响，以典型的砂土和黏土边坡为例初步探索了前期降雨对边坡稳定性影响规律。结果表明：初始条件对不同土体边坡稳定性影响不同；建议将多年平均降雨量对应的稳态渗流场作为初始条件进行非饱和渗流分析。边坡土体渗透系数越低，边坡稳定性受前期降雨的影响越大、影响时间也越长。砂土和黏土边坡稳定性分析时建议至少考虑15 d以上的前期降雨，对于砂土边坡还应根据这15 d前面5 d的降雨情况确定是否需要增加计算天数。短历时高强度前期降雨对砂土边坡稳定性影响更大，而长历时低强度前期降雨对黏土边坡稳定性影响更大。累积前期降雨量可以作为判断边坡最小安全系数出现时刻的依据。砂土边坡出现最小安全系数时刻与10 d累积前期降雨量最大的时刻较为吻合，而黏土边坡则与15 d累积前期降雨量最大的时刻较为吻合。
기우삼협고구실측강우자료，연구료불동초시조건대불동토체변파은정성영향，건의료능구반영변파함수상태적초시조건선취방법。재차기출상，채용비포화삼류분석방법연구료전기강우대불동토체변파은정성영향，이전형적사토화점토변파위례초보탐색료전기강우대변파은정성영향규률。결과표명：초시조건대불동토체변파은정성영향불동；건의장다년평균강우량대응적은태삼류장작위초시조건진행비포화삼류분석。변파토체삼투계수월저，변파은정성수전기강우적영향월대、영향시간야월장。사토화점토변파은정성분석시건의지소고필15 d이상적전기강우，대우사토변파환응근거저15 d전면5 d적강우정황학정시부수요증가계산천수。단력시고강도전기강우대사토변파은정성영향경대，이장력시저강도전기강우대점토변파은정성영향경대。루적전기강우량가이작위판단변파최소안전계수출현시각적의거。사토변파출현최소안전계수시각여10 d루적전기강우량최대적시각교위문합，이점토변파칙여15 d루적전기강우량최대적시각교위문합。
Based on the measured rainfall data in the Three Gorges reservoir area, this paper investigates the effect of different initial conditions on different types of soil slope stability. A method to reflect the real initial conditions of the water content in the slope is recommended. Unsaturated seepage analysis is adopted to study the effect of antecedent rainfall on different types of soil slope stability. The typical sand and clay slopes are taken as examples to investigate the effect of antecedent rainfall on slope stability. The results indicate that the effect of the initial conditions on different types of soil slope stability can differ considerably. It is recommended that the steady-state seepage field under average annual rainfall can be used as the initial conditions for transient seepage analysis. The lower soil permeability coefficient, the greater impact of antecedent rainfall can on slope stability, and the longer time affected by antecedent rainfall. It is recommended that more than 15 days antecedent rainfall should be considered for sand and clay slopes stability analysis. Furthermore, more computational effort for sand slopes will depend on the 5 days rainfall before these 15 days rainfall. The short term and high density antecedent rainfall has a significant effect on sand slope stability, whereas the long term and low density antecedent rainfall has a significant effect on clay slope. The cumulative antecedent rainfall can be taken as a criterion to determine the minimum factor of safety. For the sand slopes, the time corresponding to the minimum factor of safety matches well with the time corresponding to the maximum 10-day cumulative antecedent rainfall, whereas, for the clay slopes, it matches well with the time corresponding to the maximum 15-day cumulative antecedent rainfall.