土工基础

›› 2016, Vol. 30 ›› Issue (2): 191-195.

• 工程实录 • 上一篇    下一篇

物部-冈部（Mononobe-Okabe）地震主动土压力计算方法的改进

邱明策，王世斌，柯才桐   

  1. （深圳市勘察测绘院海南分院，海口 570208）
  • 收稿日期:2015-03-25 出版日期:2016-04-20 发布日期:2016-04-27
  • 作者简介:邱明策（1982-），男，助理工程师，研究方向为工程勘察。

A Modified Mononobe-Okabe's Seismic Active Earth Pressure Method

QIU Mingce, WANG Shibin, KE Caitong   

  1. （Shenzhen Geotechnical Investigation and Surveying Institute, Hainan Branch, Haikou 570208）
  • Received:2015-03-25 Online:2016-04-20 Published:2016-04-27

摘要： 物部-冈部（Mononobe-Okabe）土压力理论广泛应用于地震作用下的土压力计算，但其关于土压力分布及合力作用点位置的假设与实际情况不符。从墙后滑动楔体中取出一顶面与填土表面相平行的局部楔体，通过建立楔体的力矩平衡方程，获得了侧向土压力系数的理论计算式，在此基础上推导出基于MononobeOkabe理论的非线性土压力分布及合力作用点位置公式，相关公式中考虑了挡墙发生偏转对土压力的影响。与试验实测数据的对比分析结果表明：土压力分布及合力作用点位置理论计算值与实测值基本吻合，改进的MononobeOkabe理论在有、无地震作用下均较好的反映了土压力的变化规律。

关键词: 挡土墙, 地震土压力, 拟静力法, Mononobe-Okabe理论, 非线性分布, 合力作用点

Abstract: The classic MononobeOkabe theory is widely used in the calculation of the seismic earth pressures, but its assumption of the earth pressure distribution and the action point of resultant force are inconsistent with the observed. This paper considers a wedged block with the top surface parallel to the backfill surface from the sliding wedge behind the wall. The analytical solution of the lateral earth pressure can be obtained from the moment equilibrium equations on the wedged block. The nonlinear lateral earth pressures distribution and the location of the point of action can be determined from the MononobeOkabe theory. In this formula, the lateral earth pressure magnitude changes with the rotation of the retaining wall. The formula was then verified with the model testing results and the results are consistent. The modified MononobeOkabe theory can reasonably predict the lateral under the static as well as seismic conditions.

Key words: Retaining Wall, Seismic Earth Pressure, PseudoStatic Method, Mononobe-Okabe Theory, Nonlinear Distribution, Action Point of Concentric Force