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为探究强降雨下堆积体斜坡入渗参数的空间分布与空间变异性,通过筛分试验及双环入渗试验分别对堆积体斜坡试验点不同粒径区间碎石质量分数、碎石土渗透系数、饱和渗透系数、不同深度碎石土含水率进行测量,对数据进行普通Kriging插值统计分析,运用交叉检验选定合理理论模型与参数,获得其空间分布与变异性特征。研究结果表明:测试区碎石土入渗符合Kostiakov模型;不同粒径区间碎石质量分数采用高斯半变异函数理论模型空间插值精度最高,碎石土渗透系数和不同深度碎石土含水率采用球状半变异函数理论模型空间插值精度最高;粒径大于10 mm碎石主要分布于坡顶与坡腰区域且使该区域碎石土渗透系数的空间变异性相对较大,细小碎石(粒径2~10 mm)则聚积在坡脚位置,碎石土渗透系数速率沿坡面由上至下呈逐渐减少的空间分布趋势;浅土层(0~15 cm)坡腰含水率比坡顶、坡脚要高,而深土层(15~25 cm)坡脚含水率比坡顶、坡腰要高,且随深度增加缓慢上升。研究结果可作为碎石土滑坡降雨致滑的理论参考依据。
In order to explore the spatial distribution and spatial variability of slope infiltration parameters under heavy rainfall, the influences of gravel mass fraction, gravel soil permeability coefficient, Saturated permeability coefficient and moisture content of gravel soil at different depths were measured. The data were analyzed by ordinary Kriging interpolation. The reasonable theoretical models and parameters were selected by cross test to obtain the spatial distribution and variability characteristics. The results show that the infiltration of gravel soil in the test area conforms to the Kostiakov model. The grading accuracy of the graded soil mass fraction by using Gaussian semi-variogram theory is the highest, the permeability coefficient of the gravel soil and the moisture content of the gravel soil are spherical The spatial variability of semi-variogram theory model is the highest. The gravel with particle size greater than 10 mm is mainly distributed in the top of the slope and the slope and the spatial variability of the permeability coefficient of the gravel soil is relatively large. ~ 10 mm) accumulated at the foot of the slope. The rate of permeability coefficient of gravel soil gradually decreased from top to bottom along the slope. The water content of the slope in shallow soil (0 ~ 15 cm) The height of foot is higher, while the water content of foot in deep soil (15 ~ 25 cm) is higher than the top of slope and slope, and slowly increases with depth. The results can be used as a theoretical reference for rainfall-induced slippery landslides.