摘要
本文针对嵌入式挡土墙进行拟静力极限平衡设计,采用Blum法计算动力条件下的内力和临界加速度,讨论该方法的主要缺陷,并基于真正动态二维有限差分分析的结果,提出一种新的极限平衡方法。研究表明:在水平接触应力和弯矩分布方面,拟静力预测法结果与真正的动态二维有限差分分析法获得结果以及相关文献研究结果高度吻合。随着土-墙体系强度增加,土-墙体系的临界加速度和最大弯矩均增大。土-墙系统强度越大,在振动中产生位移越小,但这一目标实现需要增加墙体内力。Blum方法仅为中等地震提供了对墙体最大内力的可靠估计,并且显著低估了临界加速度和相应的最大弯矩。相反,本文所提出的方法与数值数据吻合较好,并始终给出保守估计的最大弯矩值。
In this paper,the quasi-static limit equilibrium design of embedded retaining wall is carried out.The Blum method is used to calculate the internal force and critical acceleration under dynamic conditions.The main defects of this method are discussed,and a new limit equilibrium method is proposed based on the results of real dynamic two-dimensional finite difference analysis.The results show that the pseudo-static prediction method is in good agreement with the real two-dimensional finite difference analysis method and the results of related literature in the distribution of horizontal contact stress and bending moment.As the strength of soil-wall system increases,the critical acceleration and the maximum bending moment of soil-wall system increase.The greater the strength of the soil-wall system,the smaller the displacement in the vibration,but this goal needs to increase the internal force of the wall.The Blum meth-od provides a reliable estimate of the maximum internal force of the wall only for moderate earthquakes,and signifi-cantly underestimates the critical acceleration and the corresponding maximum bending moment.On the contrary,the method presented in this paper agrees well with the numerical data and always gives a conservative estimate of the max-imum bending moment value.
作者
沈宁
陈宏鹏
宗亮
谢东武
Shen Ning;Chen Hongpeng;Zong Liang;Xie Dongwu(Eastern China Water Conservancy Design Co.,Ltd.,Jinan 250100,China;Shuifa Planning&Design Co.,Ltd.,Jinan 250100,China;Department of Underground Architecture and Engineering,School of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《科技通报》
2024年第3期109-114,122,共7页
Bulletin of Science and Technology
基金
国家自然科学基金项目(41977227)。
关键词
拟静力极限平衡
震动
嵌入式挡土墙
quasi-static limit equilibrium
vibration
embedded retaining wall
