EPS土工泡沫作为挡土墙抗震缓冲层的数值模拟

考虑到EPS（聚苯乙烯泡沫）具有自重轻、耐久性好、抗震性能好等特点，利用有限元程序建立设置EPS缓冲层的挡土墙模型。通过对高为4 m和8m的重力式挡土墙模型的地基底部边界施加不同振幅强度（0.1g ~ 0.7g）和频率为3Hz的简谐激励，研究了EPS厚度、振动强度与墙体位移增量、墙体转角和侧向推力增量之间的关系。参数结果表明：EPS是一种经济、隔离振动效果好的缓冲层，可以有效地减少重力式挡土墙结构的振动反应。墙体受振动引起的位移增量、转角增量和侧向推力增量随着EPS缓冲层相对厚度的增加而增大，两种高度的墙体分别在缓冲层厚度达到20%、40%时，隔离振动的效率达到最优，并且能显著减小墙体的侧向土压力。

Numerical simulation of EPS geofoam as seismic buffer layer of retaining wall

Considering the characteristics of EPS geofoam, such as light deadweight, good durability and good seismic performance, the finite element program was used to establish the retaining wall model of EPS buffer layer. The relationship between EPS thickness and vibration intensity and wall displacement increment, wall Angle and lateral thrust increment was studied by applying simple harmonic excitation with different amplitude intensity (0.1g ~ 0.7g) and frequency of 3Hz at the bottom boundary of gravity retaining wall model with height of 4 m and 8m. The results show that EPS is an economical buffer with good vibration isolation effect, and can effectively reduce the vibration response of gravity retaining wall. In addition, the displacement increment, angular increment and lateral thrust increment caused by the wall vibration increase with the increase of the relative thickness of the EPS buffer layer. The wall thickness of the two heights reaches 20% and 40% respectively, the efficiency of vibration isolation reaches the optimal level, and the lateral earth pressure of the wall can be significantly reduced.