本文已被：浏览 1378次 下载 572次
投稿时间：2019-11-19 修订日期：2020-09-04
投稿时间：2019-11-19 修订日期：2020-09-04
中文摘要: 受地形限制，大量公路、铁路沿库与沿河展线，库（河）水位变化是诱发库岸滑坡的重要因素。目前，边坡渗流研究多集中在非饱和均匀流，对大孔隙边坡非平衡流方面研究仍显滞后。为此，以福建省某一典型库区边坡为例，对比水位上升条件下考虑非饱和渗流和非饱和大孔隙流时边坡水分场和稳定系数随时间的变化规律，并分析了水位上升速率（v）、大孔隙域水力传导系数（Ksf）、两域交界处水力传导系数（Ksa）、土粒中心至大孔隙边界距离（a）、大孔隙体积占比（wf）等对大孔隙边坡稳定系数的影响规律及权重。结果表明：水位上升中，非饱和渗流下边坡内部基质域含水率明显小于非饱和大孔隙渗流下边坡内部基质域含水率。非饱和渗流条件下边坡浅层向内的水力坡度明显大于非饱和大孔隙流边坡，且大孔隙边坡中相同位置基质域含水率远大于大孔隙域（最大达18.9倍）。两种渗流工况下，边坡稳定系数随水位上升均呈现先减小后增大的趋势，并于同一水位（在最高蓄水位高程的一半附近）同时达到最小值。相同渗流工况下，考虑非饱和大孔隙渗流边坡稳定系数更小。增加v、Ksf、a、wf或减少Ksa，坡内两域间水分交换减弱，水分将快速运移至坡体深处，引起地下水位上升，促使边坡稳定性最大降幅达17.7%。v、Ksf和wf对边坡稳定影响占权重较大且相当，Ksa和a所占权重较小且约为前者一半。
Abstract:Restricted by terrain, a large number of roads and railways often appear along the reservoir line and along the river line, and water level changes are an important factor causing landslides on the banks. At present, most of the researches on slope seepage focus on the unsaturated uniform flow, and the study on the non-equilibrium flow of macropore slope is still lagging behind. In this study, the stability factor of unsaturated seepage flow and unsaturated macropore flow slope was analyzed, and the influence law of the factors including water level rise rate (v), hydraulic conductivity in macropores (Ksf), hydraulic conductivity of the matrix-fracture interface (Ksa), the equivalent diffusion distance between two domains (a), and the volumetric fraction of macropore domain (wf) on the stabilization of slope were analyzed by macropore flow model. The results showed that the water content in the matrix area of the slope was close to saturation in the unsaturated macropore flow, and the water content in the matrix domain was obviously less than that in the matrix domain of the slope under unsaturated macroporous seepage with rise of the water level. The hydraulic gradient of the shallow inward slope was obviously larger than that of the unsaturated large pore flow slope under unsaturated seepage. The moisture content in the matrix domain was much larger than that in the macropore domain (up to 18.9 times) at the same location because the permeability coefficient of matrix domain is much smaller than that of macroporous domain. The stability factor of reservoir bank slope decreased first and then increased with the increase of reservoir water level, and it reached the minimum at the same water level (close to the height of the highest storage level ) at the same time. Under the same seepage conditions, the stability of unsaturated macropore flow was weaker than that of unsaturated seepage. Reducing Ksf, a, wf or increasing Ksa made the water exchange between the two regions become slow. As the moisture rapidly migrates to the depth of the slope, it caused the groundwater level to rise and the maximal decrease of slope stability was 17.7%. The influence of v, Ksf and wf slope stability was relatively large and equivalent, while Ksa and a were relatively small and they were about half of the former.
文章编号：201901122 中图分类号：U416.1 文献标志码：
基金项目:国家自然科学基金项目（41772297）；福建省自然科学基金项目（2018J01771）；国土资源部丘陵山地地质灾害防治重点实验室（福建省地质灾害重点实验室）开放基金项目（FJKLGH2017K003）
| 作者 | 单位 | |
| 阙云 | 福州大学 土木工程学院，福建 福州 350116 | queyun_2001@fzu.edu.cn |
| 熊汉 | 福州大学 土木工程学院，福建 福州 350116 | |
| 刘慧芬 | 佛山科学技术学院 交通与土木建筑学院，广东 佛山 528000 | liuhuifen99@163.com |
| 詹小军 | 福州大学 土木工程学院，福建 福州 350116 |
作者简介:阙云(1980-),男,教授,博士.研究方向:路基与边坡工程.E-mail:queyun_2001@fzu.edu.cn
引用文本：
阙云,熊汉,刘慧芬,詹小军.基于非饱和大孔隙流双重介质模型的浸水边坡水力响应数值模拟[J].工程科学与技术,2020,52(6):102-110.
QUE Yun,XIONG Han,LIU Huifen,ZHAN Xiaojun.Numerical Simulation of Hydraulic Response of Immersed Slope Based on Dual-permeability Model of Unsaturated Macropore Flow[J].Advanced Engineering Sciences,2020,52(6):102-110.
引用文本：
阙云,熊汉,刘慧芬,詹小军.基于非饱和大孔隙流双重介质模型的浸水边坡水力响应数值模拟[J].工程科学与技术,2020,52(6):102-110.
QUE Yun,XIONG Han,LIU Huifen,ZHAN Xiaojun.Numerical Simulation of Hydraulic Response of Immersed Slope Based on Dual-permeability Model of Unsaturated Macropore Flow[J].Advanced Engineering Sciences,2020,52(6):102-110.