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考虑吸湿膨胀及软化的膨胀土边坡稳定性分析 被引量:11

STABILITY ANALYSIS OF EXPANSIVE SOIL SLOPE CONSIDERING SEEPAGE SOFTENING AND MOISTENING SWELLING DEFORMATION
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摘要 膨胀土是一种具有显著的吸水膨胀和失水收缩特性的特殊黏性土,暴露于大气中的膨胀土边坡处于连续的干湿循环过程中,在降雨条件下极不稳定。基于饱和-非饱和渗流理论,对降雨条件下膨胀土边坡的非饱和渗流过程和吸湿过程进行了数值模拟。编写了相应的FORTRAN语言程序,考虑了渗流过程中基质吸力变化、渗流软化和吸湿膨胀的影响,分析了强度衰减、渗流软化和湿胀对膨胀土边坡整体稳定性的影响。结果表明,在降雨作用下,经过多次干湿循环后,膨胀土边坡的破坏模式为浅层牵引式崩塌,破坏面位于风化区,与普通黏性土边坡的深层圆弧滑坡有较大区别。在考虑湿胀软化效应后,边坡最大位移增大了一个数量级,稳定性系数显著降低,膨胀性是边坡浅层滑坡的主要原因。研究结果较好地解释了膨胀土滑坡特有的牵引性、反复滑动性和浅层破坏性。 Expansive soil is a kind of clay soil that expands rapidly after being immersed in water and shrinks significantly after losing water.The expansive soil slopes exposed to the atmosphere are in the process of continuous dry and wet cycles and are extremely unstable under the conditions of rainfall.Based on saturated-unsaturated seepage theory,the unsaturated seepage process and humidification process of the expansive soil slope under rainfall are simulated,and a related FORTRAN language program is developed.The effects of matrix suction changes,seepage softening,and moistening expansion during the seepage process are considered.The effects of strength attenuation,seepage softening,and moistening expansion on the overall stability of the expansive soil slope are analyzed.The results show that under the action of rainfall,the failure mode of the expansive soil slope after multiple dry-wet cycles is shallow collapse,and the failure surface is located in the weathered area,which is quite different from the traction landslide of the homogeneous expansive soil slope.After considering the moistening expansion and softening effects,the maximum displacement of the slope can be increased by an order of magnitude,and the safety factor can be decreased significantly.The research results well explain the special tractive and shallow properties of typical expansive soil landslides.
作者 赵思奕 石振明 鲍燕妮 周海容 彭铭 ZHAO Siyi;SHI Zhenming;BAO Yanni;ZHOU Hairong;PENG Ming(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;University Architectural Design Research Institute(Group)Co.,Ltd.,Shanghai 200092,China)
出处 《工程地质学报》 CSCD 北大核心 2021年第3期777-785,共9页 Journal of Engineering Geology
关键词 膨胀土 干湿循环 吸湿膨胀 边坡失稳 Expansive soil Dry-wet cycle Moistening swelling Slope instability
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