残积碎石土斜坡特性参数空间变异性野外调查方法研究

Investigation Method of Spatial Variability of Characteristic Parameters of Residual Gravel Soil Slopes

特性参数空间变异性是碎石土斜坡随机结构的参数化表征,其合理确定对碎石土斜坡稳定性评价具有重要意义,但现有确定方法工作量大、成本高。提出一种轻量化的碎石土斜坡特性参数空间变异性野外调查方法,并应用于黄冈某残积碎石土斜坡工程实例,得到了碎石土斜坡特性参数空间变异性的初步认识。结果表明:提出的碎石土斜坡特性参数空间变异性野外调查方法有效且方便可行,确定的碎石土斜坡特性参数统计数据特征符合经验认识;目前关于碎石土斜坡特性参数的空间相关性和互相关性的经验认识较少,通过调查确定的碎石土斜坡特性参数的空间相关距离和互相关系数为该方面研究积累了定量数据:该斜坡工程实例水平、垂直、顺坡向的相关距离分别为1.24~2.25 m、0.76~1.23 m、0.14~0.39 m。

The spatial variability of characteristic parameters is a parameterized representation of the random structure of a gravel soil slope.Its reasonable determination is of great significance to the evaluation of gravel soil slope stability,but the existing determination methods have a large workload and high cost.We proposed a field investigation method for the spatial variability of slope characteristic parameters in gravel soil,and applied it to a residual gravel soil slope in Huanggang to obtain a preliminary understanding of the spatial variability of slope characteristic parameters of gravel soil.The results show that the field spatial variability survey method of gravel soil slope characteristic parameters proposed in this paper is effective,convenient and feasible,and the statistical characteristics of the characteristic parameters are consistent with empirical knowledge.At present,there is little empirical knowledge about the spatial correlation and cross-correlation of slope characteristic parameters of gravel soil.The spatial correlation distance and crosscorrelation number of slope characteristic parameters determined by investigation provide quantitative data for related research.The horizontal,vertical and along-slope correlation distances of slope examples are:1.24-2.25 m,0.76-1.23 m,0.14-0.39 m.