水-气耦合下的土质边坡稳定系数场分析  

Analysis of local safety factor of soil slope considering water-air coupling

作　　者：姚晓琴[1] 张豪杰[1] 阙云[2] 丁辉 许泽钦 何燕清[1] YAO Xiaoqin;ZHANG Haojie;QUE Yun;DING Hui;XU Zeqin;HE Yanqing(Zhicheng College,Fuzhou University,Fuzhou,Fujian 350002,China;College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学至诚学院,福建福州350002 [2]福州大学土木工程学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2024年第3期337-344,共8页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(2023J011133);福建省住房和城乡建设厅科技项目(2022-K-319);福建省中青年教师教育科研项目(JAT210644)。

摘　　要：传统边坡稳定性分析方法仅对潜在滑动面进行整体稳定性评估,无法获取各点的安全系数.基于稳定系数场理论,综合考虑水-气耦合作用,对降雨条件下边坡稳定性进行分析.结果表明:1)稳定系数场法能够直观地体现水-气耦合作用下边坡的具体破坏区域,得到各点的安全系数;2)孔隙气压力对边坡降雨入渗有一定阻碍作用,并且随着降雨时间的推移阻渗效果愈明显,相同条件下降雨40 h时,两相流湿润锋深度较单向流减小了28.6%;3)相同条件下,考虑水-气耦合作用将降低边坡稳定性,以降雨40 h为例,两相流边坡失稳面积约为单向流的1.7倍.因此,在实际工程中对边坡稳定性分析时考虑水-气耦合作用,工程偏于安全.The traditional slope stability analysis method only evaluates the overall stability of the potential sliding surface,and cannot obtain the safety factor of each point.Based on the theory of local safety factor,the stability of the slope under rainfall conditions is analyzed comprehensively considering the water-air coupling effect.The results show that the method of local safety factor can directly reflect the specific failure area of the slope under the water-air coupling.The pore gas pressure has a little anti-infiltration effect on the slope rainfall infiltration,and the anti-infiltration effect becomes more obvious with the passage of rainfall time.Under the same conditions,when the rainfall is 40 hours,the depth of the wet front of the two-phase flow is reduced by 28.6%compared with the unidirectional flow.Considering that the effect of water-air coupling will reduce the stability of slope,when the rainfall is 40 hours,the instability area of the two-phase flow slope is about 1.7 times that of the unidirectional flow under the same conditions.Therefore,the water-air coupling effect should be considered when analyzing the slope stability in actual engineering,and the engineering tends to be safer.

关 键 词：稳定系数场 湿润锋 水-气耦合 土质边坡 稳定性 灾害防治 

分 类 号：U416.1[交通运输工程—道路与铁道工程]