【摘要】 在滑动楔体上沿竖向取水平薄层作为微分单元体,通过作用在单元体上的水平力、竖向力及地震力,建立挡土墙主动土压力基本方程,结合滑楔体力矩平衡条件,得到对应不同地震系数的侧压力系数,将其用于水平微分单元法,得到了地震荷载作用下挡土墙主动土压力理论公式.分析地震系数对土侧压力系数和土压力的影响,结果表明,土侧压力系数随水平地震系数增加而增大;当竖向地震系数小于零时,土侧压力系数随竖向地震系数增大而减小,当竖向地震系数大于零时,土侧压力系数随竖向地震系数增大而增大;随着竖向地震系数的增大,水平土压力强度最大值逐渐减小,随着水平地震系数的增大,水平土压力强度最大值先递减后增大;随着竖向及水平地震系数的增大,水平土压力最大值位置向墙顶方向移动,靠近墙底处土压力强度相对减小,靠近墙顶处土压力强度相对增大.更多还原

【Abstract】 The basic analysis equations were set up by considering the equilibrium of the forces on a thin-layer element of the wedge.By using the equilibrium equation of the moments on the whole wedge,the lateral coefficient of earth pressure,and the earth pressure distribution along the wall were obtained.The effects of seismic coefficient on the lateral coefficient of earth pressure and the distribution of earth pressures were investigated.The results show that the lateral earth pressure coefficient increases as the horizontal seismic coefficient increases.The effect of the vertical seismic coefficient is more complicated.If the vertical seismic coefficient is less than zero,the lateral earth pressure coefficient decreases as the vertical seismic coefficient increases;If the vertical seismic coefficient is greater than zero,the lateral earth pressure coefficient increases as the vertical seismic coefficient increases;the maximum earth pressure gradually decreases as the vertical seismic coefficient increases.The maximum earth pressure first decreases and then increases as the horizontal seismic coefficient increases;as the increase of the vertical and horizontal seismic coefficient increases,the position of the maximum lateral seismic earth pressure moves gradually to the top of the wall,but near the bottom of the wall,the relative value of the earth pressure decreases,and near the top of the wall,the relative value of the earth pressure increases.The proposed method was verified by some experiment data.The calculated resultant and maximum earth pressure agree well with the experiment results.The effect of seismic coefficient on the points of application of the resultant earth pressure was investigated.The proposed method was compared with the Mononobe-Okabe’s theory.The results indicate that it is dangerous for the overturning stability of retaining walls with the translational movement mode if they are designed according to the Mononobe-Okabe’s theory.更多还原