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当挡土墙附近存在临近建筑地下室外墙时,其挡土墙土压力与传统的Rankine理论基于无限半空间体假定不符,因而在这种新的工程背景下需要采用合适的理论来计算挡土墙土压力及其作用点高度。已有的研究表明,这种条件下土体的变形趋势可分为上、下两大部分:上部土体变形类似于Terzaghi的活动门试验,土体沿着墙体下滑,而下部土体则沿着土楔形体而变形。因而将土拱效应用于求解挡土墙土压力的计算分成了上、下两大部分考虑。假定土拱形状为圆弧,基于主应力旋转概念分别给出了上、下两部分的侧向土压力系数,运用水平微分层析法基于静力平衡思想给出了两部分的水平向主动土压力分布公式。最后通过坐标平移的方式给出了主动土压力合力及其作用点高度的表达式。算例表明,计算结果与数值计算结果较为接近,其结果对实际工程有一定的参考价值。
When there is an external wall near the retaining wall near the building basement, the earth pressure on the earth retaining wall is inconsistent with the traditional Rankine theory based on the assumption of infinite half-space body. Therefore, in this new engineering background, appropriate theories need to be used to calculate the retaining earth Wall pressure and its role point height. The existing research shows that the deformation trend of soil under this condition can be divided into upper and lower parts: the deformation of the upper soil is similar to the activity test of Terzaghi, the soil slides along the wall, while the lower soil Deformed along the soil wedge. Therefore, the calculation of soil arching effect for solving earth pressure on retaining wall is divided into upper and lower two major considerations. Assuming that the shape of soil arches is a circular arc, the lateral earth pressure coefficients of the upper and lower parts are given respectively based on the principal stress rotation concept. Two levels of horizontal active soil are given based on the static balance theory by using horizontal differential tomography Pressure distribution formula. Finally, the expression of active earth pressure resultant force and its action point height is given by coordinate translation. The example shows that the calculation result is close to the numerical calculation result, and the result has certain reference value for the actual project.