摘要
采用有限元软件（Seep／W和Slope／W）开展一系列瞬态渗流和极限平衡分析，研究不同降雨强度与历时对膨胀土边坡渗流场的影响，分析降雨强度及历时、不同坡比和坡高等因素对边坡稳定性的影响，分析其浅层破坏的原因。结果表明：必须考虑风化裂隙导致浅表层土体渗透系数增大对膨胀土边坡渗流场的影响；降雨强度及历时对边坡土体孔隙水压力分布影响显著，相同降雨强度条件下，历时越长，影响深度越深、范围越大，孔隙水压力变化越大；相同历时条件下，持续降雨强度越小，影响深度越浅、范围越小，孔隙水压力变化越小；安全系数随降雨强度的增大，其下降速率越快，达到破坏所需的时间越短；边坡浅层达到饱和时，坡高及设置平台对边坡安全系数影响不大，均发生浅层破坏；安全系数随坡率的增大而增大，但对某些膨胀土边坡而言，采用放缓坡率的做法并不可取。
By using the finite element software （Seep/W and Slope/W）, a series of transient seepage analysis and limit equilibrium were carried out to research the effects of different rainfall intensity and duration on expansive soil slope seepage field, and analyzed the effects of rainfall intensity and duration, different slope ratios and slope factors on slope stability. The causes of shallow failure of expansive soil slope were analyzed. The results showed that the effect of seepage coefficient increasing in shallow layer due to weathering fissure on expansive soil slope seepage must be considered; the influence of rainfall intensity and duration on slope soil pore water pressure distribution was significant; for the same rainfall intensity, the rainfall duration was longer, the influence depth was deeper and larger, the variation in pore water pressure was larger; for the same rainfall duration, the continuous rainfall duration was smaller, the influence depth was more shallow, the range was smaller, the variation of pore water pressure was smaller; the safety of factor decreased more quickly with the increase in rainfall intensity, the failure time of slope was shorter; the shallow soil layer of slope reached saturation condition, slope height and setting platform had little effect on the safety factor of slope, the failure occurred in shallow soil layer; the safety factor increased with the slope rate increasing, but for some of the expansive soil slope, the approach of gentle slope was not desirable.
作者
湛文涛
肖杰
陈冠一
常锦
ZHAN Wentao,XIAO Jie,CHEN Guanyi,CHANG Jin(1. Hubei Communications Investment Intelligent Detection Co. Ltd,Wuhan 430030, China; 2. School of Traffic and Transportation Engineering, Changsha University of Science ＆ Technology, Changsha 410114, China)
出处
《工业建筑》
CSCD
北大核心
2018年第9期133-139,共7页
Industrial Construction
基金
国家自然科学基金项目(51608053)
湖南省自然科学基金项目(2017JJ3335)
长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金资助项目(kfj20160401)
湖南省教育厅科研项目(15C0043)
关键词
膨胀土
渗流
数值模拟
稳定性分析
expansive soil slope
seepage
numerical simulation
stability analysis
作者简介
第一作者：湛文涛，男，1986年出生，硕士研究生，工程师。;通信作者：肖杰，xiaojie324@csust．edu．cn。
