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利用有限元法分析了土工格室柔性挡墙水平变位特征,得到了墙体中部水平变位的分界点,提出了主动土压力的计算方法。分界点上部位移模式接近平动,采用库仑主动土压力理论计算上部的土压力,分界点下部位移模式接近绕墙脚的转动,采用水平微分单元法计算下部的土压力,并比较了计算结果与实测结果。比较结果表明:土压力计算结果与实测结果沿墙高的分布形态及增长趋势基本一致,计算值比实测值略偏小一些,偏差最小为0.2 kPa,最大为2.9 kPa,平均偏小为1.2 kPa,可见土压力计算方法可靠。
The finite element method is used to analyze the horizontal displacement characteristics of the geocell flexible retaining wall, and the demarcation point of horizontal displacement in the middle of the wall is obtained. The calculation method of active earth pressure is proposed. The displacement of the upper part of the demarcation point is nearly parallel. The Coulomb’s theory of active earth pressure is used to calculate the upper earth pressure. The displacement pattern of the lower part of the demarcation point is close to the rotation around the foot of the wall. The horizontal differential element method is used to calculate the earth pressure in the lower part. result. The results show that the distribution and trend of soil pressure along the wall are basically the same, the calculated values are slightly smaller than the measured values, the minimum deviation is 0.2 kPa, the maximum is 2.9 kPa and the average is 1.2 kPa , Shows that earth pressure calculation method is reliable.