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传统降雨入渗分析仅以降雨强度在坡面上的正交分量作为边界条件,不符合实际降雨非正交入渗规律。为了研究非饱和砂土的非正交入渗规律性,采用自行研制的室内降雨试验装置对非饱和砂土坡面进行了一系列不同降雨强度、坡角和孔隙比的降雨入渗试验,并对应地进行了正交入渗条件下的数值模拟。测量了入渗率、出渗速率及砂土储水增量随时间变化的关系曲线,分析了雨强、坡角和孔隙比对试验结果的影响。试验结果显示各试验中均无坡面径流现象,与正交入渗边界理论差异显著。通过分析非饱和砂土在传统坡面降雨正交入渗边界条件下的入渗率、出渗速率及砂土储水增量等数值模拟结果与对应的降雨入渗试验结果的差异,证明按正交入渗边界理论计算得到的砂土坡面土体含水率、入渗能力及坡面边界条件转化的判别机制均与实际情况不符。
Traditional rainfall infiltration analysis only takes the orthogonal component of rainfall intensity on the slope as the boundary condition, which does not accord with the non-orthogonal infiltration law of actual rainfall. In order to study the non-orthogonal infiltration regularity of unsaturated sand, a series of rainfall infiltration tests were conducted on unsaturated sandy slope with different rainfall intensities, slope angles and void ratios using a self-developed indoor rainfall test device Correspondingly, the numerical simulation under the condition of orthogonal infiltration was carried out. The relationship curves of infiltration rate, infiltration rate and sand storage increment with time were measured, and the influence of rainfall intensity, slope angle and void ratio on the test results were analyzed. The test results show that there is no slope runoff phenomenon in each experiment, which is significantly different from the theory of orthogonal infiltration boundary. By analyzing the difference of infiltration rate, infiltration rate and sand storage increment of unsaturated sand under the traditional rainfall infiltration boundary conditions and the corresponding rainfall infiltration test results, Infiltration boundary theory calculated sand soil slope soil moisture content, infiltration capacity and slope boundary conditions transformation discrimination mechanism are inconsistent with the actual situation.