CAJ | 학술논문

传统的土压力分析仅考虑了土体饱和强度对土压力产生的贡献，忽略了基质吸力及其变化对土压力的影响。运用非饱和土有效应力原理和饱和土朗肯土压力公式推导了非饱和土朗肯土压力公式，结合Iverson降雨入渗解析解，推导出降雨入渗条件下非饱和土压力公式。该公式将降雨入渗时的非饱和土压力表示为时间和深度的函数，更符合实际情况。研究结果表明：采用该方法计算得到的土压力值相对于传统计算结果偏大，作用点偏高；此外，随着降雨的发生、入渗和停止，主动土压力呈现“减小-增大-减小-稳定”趋势，被动土压力呈现“增大-减小-增大-稳定”趋势，该现象由降雨过程中基质吸力改变所致。由该公式获得的土压力分布及变化规律可用于挡土工程结构的设计。
전통적토압력분석부고필료토체포화강도대토압력산생적공헌，홀략료기질흡력급기변화대토압력적영향。운용비포화토유효응력원리화포화토랑긍토압력공식추도료비포화토랑긍토압력공식，결합Iverson강우입삼해석해，추도출강우입삼조건하비포화토압력공식。해공식장강우입삼시적비포화토압력표시위시간화심도적함수，경부합실제정황。연구결과표명：채용해방법계산득도적토압력치상대우전통계산결과편대，작용점편고；차외，수착강우적발생、입삼화정지，주동토압력정현“감소-증대-감소-은정”추세，피동토압력정현“증대-감소-증대-은정”추세，해현상유강우과정중기질흡력개변소치。유해공식획득적토압력분포급변화규률가용우당토공정결구적설계。
The conventional earth pressure analysis method only considers the shear strength of saturated soil, which ignores the influence of matrix suction as well as its change. Based on the principle of effective stress of unsaturated soil and Rankine's earth pressure formula of saturated soil, the Rankine's earth pressure formula of unsaturated soil is deduced. The earth pressure formula of unsaturated soil under the condition of rainfall is established by the combination of the formula derived above and Iverson’s rainfall infiltration analytical solution. In the formula, earth pressure of unsaturated soil under rainfall infiltration is expressed as a function of time and depth. The study result shows that the earth pressure value calculated by the improved method is relatively larger than the conventional calculation and its action point is higher. With the occurrence, infiltration and stop of rainfall, the value of active earth pressure is at a state of “decreasing, increasing, decreasing and lastly stable”; but the value of passive earth pressure presents a tendency of“increasing, decreasing, increasing and stable”. The phenomenon is due to the change of matrix suction during rainfall. The distribution and change rule of earth pressure calculated by the proposed formula can be applied to design of retaining engineering structure.