刚性挡土墙后粘性土土压力研究

Earth Pressure of Cohesive Soil Acting on Rigid Retaining Wall

经典朗肯和库伦土压力理论在实际工程中有着广泛应用,但它们的适用范围也十分明显.基于土体的极限平衡理论,考虑了粘性填土、墙土间的粘着力、连续均布超载等因素对挡土墙土压力的影响,并利用力矢量多边形法,推导出适用多种复杂条件下的粘性土土压力计算式,给出了极限状态下滑动楔体临界破解角的显式解答.该公式适用的范围较广,在朗肯或库伦理论假设条件下能够得到与之完全一致的解答,对刚性挡土墙的设计计算具有一定的应用价值.

Classical Rankine＇ s and Coulomb＇ s earth pressure theory has been widely used in the practical engi- neering, but their application scope is also limited. In the report, based on the limit equilibrium theory of soil mass, and the effects of cohesive soil , adhesive force on interface of soil and retaining wall and the uniformly distributed load on the earth pressure on retaining wall were taken into consideration, the force vector polygon method was used to derive the calculation formula of earth pressure of cohesive soil under the complicated condi- tions, and the explicit solutions of the critical rupture angle under the ultimate state were proposed. The applicable scope of the formula is wide, and the solution can be as same as that of Rankine＇ s or Coulomb＇ s theory. So, it has a certain practical value for the design and calculation of rigid retaining wall.