摘要
为探究裂隙和膨胀力综合影响下的膨胀土边坡稳定性,通过引入膨胀力对传统圆弧形滑动面稳定系数的计算公式进行改进,运用有限元方法探究膨胀土边坡在不同降雨工况下渗流场的时空分布规律和稳定系数变化规律。经探究,改进后的稳定系数计算公式可较好地反映膨胀特性的影响及稳定系数的变化规律,能较好地适用于膨胀土边坡稳定性分析;降雨强度、降雨历时和裂隙深度共同决定膨胀土边坡经雨水入渗的影响深度,且该深度同膨胀土边坡在气候营力作用下形成的风化带深度相近。停雨期内,裂隙的存在会加剧孔隙水压力的消散;膨胀力严重影响稳定系数,考虑膨胀力后稳定系数减小约30%;稳定系数会随降雨强度、降雨历时和膨胀力的增大持续减小。
In order to explore the stability of expansive soil slope under the comprehensive influence of fracture and expansion force,the calculation formula of stability coefficient of traditional circular sliding surface is improved by introducing expansion force,and the time-space distribution law of seepage field and the change law of stability coefficient of expansive soil slope under different rainfall conditions are explored by using the finite element method.After investigation,the improved calculation formula of stability coefficient can not only show the influence of expansion characteristics,but clearly reflect the change rule of stability coefficient which can be better applied to the stability analysis of expansive soil slope.The rainfall intensity,rainfall duration and fracture depth determine the influence depth of expansive soil slope through rainwater infiltration,and the depth is similar to the depth of the weathering zone.During the period of rain stopping,the existence of cracks will aggravate the dissipation of pore water pressure,and the expansion force will seriously affect the stability coefficient,reduced by about 30%after considering the expansion force.The stability coefficient decreases with the increase of rainfall intensity,rainfall duration and expansion force.
作者
白玉祥
韦秉旭
郑威
杨超
BAI Yuxiang;WEI Bingxu;ZHENG Wei;YANG Chao(School of Traffic and Transportation Engineering,Changsha University of Science and Technology,Changsha 410114,China)
出处
《交通科技与经济》
2020年第5期49-56,共8页
Technology & Economy in Areas of Communications
基金
长沙理工大学校级实践创新项目(SJCX201902)。
关键词
降雨入渗
裂隙
膨胀力
稳定性分析
rainfall infiltration
fracture
expansion force
stability analysis
