坦墙上土压力计算探讨

为寻求坦墙条件下土压力计算方法,建立坦墙土压力判别式,给出不同情况下坦墙主动土压力计算公式。对于填土水平时的坦墙,可采用朗肯理论或库伦理论计算土压力,前者计算简单方便,后者计算复杂;当填土面倾角等于土的内摩擦角时,由于墙背临界倾角等于零,即第2滑动面为通过墙踵的垂直面,因此,对于俯斜式挡土墙,无论墙背的倾角多大,须按坦墙情况计算土压力。

Discussion on the Soil Pressure on Retaining Wall

In order to seek the calculation method for the soil pressure on the retaining wall,the authors have established a discriminant and worked out the calculation formula for active soil pressure under different conditions.Rankine theory and Coulomb theory can both be used to calculate soil pressure when soil is filled levelly behind the retaining wall.The former formula is simple and convenient while the latter is more complex.When the soil is filled at an angle equal to the internal friction angle,the wall’s back obliquity is then equal to zero,which means that the second sliding surface is the vertical plane through the wall heel.Therefore no matter how large the incline-style retaining wall obliquity is,the soil pressure shall be calculated according to the condition of retaining wall.