复杂条件下挡土墙地震土压力统一解  

Unified Solution of Seismic Earth Pressure Acting on Retaining Wall under Complicated Condition

作　　者：柯才桐[1] 陈奕柏[1] 高洪波[1] 谢洪波[1] 

机构地区：[1]海南大学土木建筑工程学院,海南海口570228

出　　处：《公路交通科技》2014年第3期49-55,64,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51268010)

摘　　要：针对Mononobe-Okabe理论的不足,从滑动楔体处于极限状态时力的平衡条件出发,结合拟静力法与闭合力矢量多边形法,推导了考虑滑裂面上填土的黏聚力、墙土间黏着力、均布超载、填土开裂及地震荷载作用等条件下的黏性土主被动土压力计算式,并通过图解法给出了临界破裂角的显式解答。在相应简化条件下Mononobe-Okabe理论计算式为该公式的特例。研究表明:不考虑地震荷载对均布超载的影响,得到主动土压力偏小而被动土压力偏大;地震条件下的主动与被动土压力随水平地震系数的递增分别增大与减小,随竖向地震系数递增均减小;当水平地震系数取值较大时,将出现随竖向地震系数递增主动土压力先减小后增大的特殊情况。Aiming at the insufficiency of the Mononobe-Okabe earth pressure theory, from the condition of the equilibrium of the force when the slide wedge is in limit equilibrium, using the pseudo-static method and the vector polygon method of closing force, the active and passive earth pressure formulas of cohesive soil which consider the cohesion force on sliding plane, the adhesive force on interface of soil and retaining wall, the uniformly distributed overload, backfill cracks and seismic loads are derived, and the explicit solutions of the critical rupture angle are given through graphical method. Mononobe-Okabe＇s theoretical calculation formula is a special case of the proposed formula under corresponding simplified situations. The result shows that （ 1 ） ignoring the effect of seismic force on uniformly distributed overload, the active earth pressure is small while the passive is large; （2） under the condition of earthquake, as horizontal seismic coefficient accumulates, the active earth pressure gets larger and the passive gets smaller, while as vertical seismic coefficient accumulates, they both gets smaller; （3） when horizontal seismic coefficient is relatively larger, as vertical seismic coefficient accumulates, it will come to a special case that the active earth pressure gets smaller first and then larger.

关 键 词：道路工程 挡土墙 拟静力法 地震土压力 主动土压力 黏性土 均布超载 

分 类 号：TU432[建筑科学—岩土工程]