滑坡碎石土原位渗透试验及渗透系数预测研究  

In-situ permeability testing of gravel soils of landslides and permeability coefficient prediction

作　　者：李学良[1,2,3] 卢书强[1,2,3] 张国栋[1,2,3] 李泯蒂 徐志华[1,2,3] 

机构地区：[1]三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002 [2]三峡大学湖北长江三峡滑坡国家野外科学观测研究站,湖北宜昌443002 [3]三峡大学湖北省地质灾害防治工程技术研究中心,湖北宜昌443002 [4]长江三峡通航管理局,湖北宜昌443113

出　　处：《人民长江》2016年第10期41-44,53,共5页Yangtze River

基　　金：湖北省自然科学基金创新群体项目(2012FFA040);湖北省自然科学基金项目(2014CFB677);湖北省科技支撑计划(2013BEC005;2015BCE038)

摘　　要：滑坡碎石土渗透系数是滑坡稳定性评价和治理工程设计的重要参数之一,由于影响渗透系数的因素较多,渗透系数与各影响因素之间的相关程度和相关关系是建立渗透系数经验公式的关键。对三峡库区秭归县15个滑坡30个试验点开展了原位渗透试验和颗粒级配试验,基于Person线性相关分析法和支持向量机回归(SVR)分析法,分析了碎石含量、孔隙比、特征粒径、曲率系数、不均匀系数与渗透系数之间的相关程度及滑坡不同位置各样本之间关联关系,建立了支持向量机回归模型。结果表明:渗透系数与滑坡碎石土的影响因素指标之间线性相关性不强,基于单因素指标建立的渗透系数线性经验公式可能存在较大误差;支持向量机回归方法能够较好地反映渗透系数与因素指标之间复杂的非线性关系,渗透系数的预测结果精度较高,可以作为滑坡碎石土渗透系数的预测模型。The permeability coefficient of landslide gravel is one of the major parameters in the evaluation of landslide stability and the design of harnessing projects. Due to the large amount of factors that affect the permeability coefficient,the correlation between permeability coefficient and other factors is the key to establish the empirical formula of permeability coefficient. A series of in- situ permeability tests and grain composition tests of 15 landslide gravels were carried out in Zigui County,Three Gorges Reservoir area,and the analytical methods of Person linear dependence and SVR were used to obtain the correlated degree between the permeability coefficient and gravel content,porosity,characteristic particle size,coefficient of curvature,non- uniform coefficient,as well as the correlation among the samples from various landslides,then a model of SVR was established. The results show that there was no obvious linear relationship between permeability coefficient and these influential factors,so the empirical formula based on the single factor indicator may not be accurate. However,the method of SVR can well reflect the complicated nonlinear relation between the permeability coefficient and these influencing factors,which can be used as a predicting model for permeability coefficient of landslide gravel.

关 键 词：原位试验 碎石土 渗透系数 预测模型 SVR 

分 类 号：P642[天文地球—工程地质学]