渗透系数作为岩体卸荷分带量化指标的研究

A study of coefficient of permeability as a quantitative classification index for unloaded zones of rockmass

摘要: 渗透系数在一定程度上可以反映岩体内部裂隙发育程度、节理开度及卸荷程度,因此常作为岩体卸荷带划分的定量指标之一。但由于卸荷岩体的非线性特征,以及卸荷带研究方法和工程背景条件等方面的差异,各家划分卸荷带时所采用的渗透系数界限标准各有不同。本文从工程实例出发,通过对定性划分的各卸荷分带内对应钻孔段渗透系数的统计分析,以其统计平均值作为岩体卸荷分带的界线标准。实际应用表明,渗透系数作为卸荷带划分依据具有一定的优势,按渗透系数划分的卸荷带深度与其他方法综合确定的卸荷带深度基本接近。

Abstract: Coefficient of permeability,to some extent,can represent the development degree of joints,joint openness and unloaded degree,and is often taken as one of the quantitative classification indexes for unloaded zones of rockmass.Due to nonlinear characteristic of unloaded rockmass,difference in research methods and difference in background conditions,each sticks to his argument about the partition limit of water coefficient of permeability adopted by each researcher for the unloaded zones.Taking con...