摘要
Morgenstern-Price法是广泛应用的土坡稳定分析严格法,原文采用总应力形式,用孔隙水压力系数计算渗流场内各点水压力,间接计算土体有效应力。因浸润线以下土条内水重力与土条左侧面、右侧面、底面水压力合成为渗流力,土体受力分为两部分:一部分是土体的浮重力及侧面有效土压力,另一部分是水体作用的渗流力。基于此重新分析了土条受力,沿用Morgenstern-Price原文推导方法建立有效应力形式的力平衡和力矩平衡表达式,以及安全系数和比例因子的新求解算式,最后采用朱大勇简便方法求解安全系数和比例因子。应用2个算例的8种计算工况对新建立的Morgenstern-Price法的有效应力形式进行验证,结果与原总应力形式计算结果相近,证明该方法正确。
Morgenstern-Price method has been widely used for soil slope stability analysis. While in the original paper,total stress method was applied for mathematic derivation,the effective stress of soil body was calculated indirectly from pore pressure which related to pore pressure coefficient γu . The resultant of weight of water with same volume of soil body under the phreatic line and pore pressure acting on sides of soil slice was seepage force. Forces acting on soil slice under phreatic line could be separated into effective stresses from soil skeleton and buoyancy from pore pressures. The forces acting upon soil slice were reanalyzed. Two equations for forces and moments equilibrium in respect of effective stress were founded. A new formula for safety factor and scaling parameter was deduced. The new procedure of Zhu for computing the factor of safety was used for determining the safety factor and scaling parameter. Two classical cases were studied by the new equations. The results showed that the effective stress form of Morgenstern -Price method for soil slope stability analysis was validated.
作者
杨建民
张正
陈凯强
YANG Jianmin;ZHANG Zheng;CHEN Kaiqiang(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast CivilStructure Safety (Tianjin University) ,Ministry of Education,Tianjin 300350,China)
出处
《工业建筑》
CSCD
北大核心
2019年第6期117-123,129,共8页
Industrial Construction
基金
天津大学北洋学者·青年骨干教师计划资助项目
