论文部分内容阅读
经典土压力理论只能计算挡土墙位移达到极限状态时的土压力。为了更贴近工程实际,需要发展非极性土压力理论,但以往的研究仅限于砂土。对于黏性土的非极限主动土压力,在已有成果的基础上,从黏性土的应力莫尔圆出发,推导了介于初始状态和极限主动状态之间的中间状态时,黏性土的内摩擦角随墙体位移变化的关系公式;同时考虑了墙土接触面上外摩擦角和黏聚力cw的影响,根据黏性土应力莫尔圆的几何关系得到了土体黏聚力c与墙体位移的关系;最后应用水平分层法求得了非极限状态时黏性土的主动土压力计算公式。与模型试验数据的对比分析表明,理论计算值和试验实测值基本吻合。研究表明,计算方法对于计算黏性土在非极限状态时的主动土压力具有一定的理论意义,在实际工程中也具有相应的实用价值。
The classical earth pressure theory can only calculate the earth pressure when the retaining wall displacement reaches the limit state. In order to be closer to engineering practice, the theory of apolar earth pressure needs to be developed, but the previous research was limited to sand. For the non-limit active earth pressure of cohesive soil, on the basis of previous results, starting from the Mohr’s circle of cohesive soil, when the intermediate state between initial state and ultimate active state is derived, cohesive soil The relationship between the internal friction angle and the wall displacement is taken into account. The influence of the external friction angle and the cohesion cw on the wall-soil contact surface is considered. The cohesion of the soil body is obtained according to the geometric relationship of the stress- c and the displacement of the wall; finally, the horizontal stratified method is used to calculate the active earth pressure formula of the clay in the non-limit state. The comparison with the model test data shows that the calculated value is in good agreement with the experimental value. The research shows that the calculation method has certain theoretical significance for calculating the active earth pressure of clay in the non-limit state, and also has practical value in practical engineering.