Numerical Modeling of Cantilever Retaining Wall Using EPS Geofoam

Rashid Mustafa
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Abstract

Earth retaining wall structures are common civil engineering structures. Estimation of magnitude and distribution of earth pressure on retaining structures under different surcharge loading conditions is essential as they influence the design and overall economy of retaining structures. Numerical modeling using finite element code PLAXIS is used static analysis. 7 m height of non-yielding cantilever retaining wall with and without EPS geofoam structure is studied and 20 m backfill width was considered. In the present study backfill was modeled as Mohr-Coulomb yield criteria and EPS geofoam and wall were modeled as Linear-elastic. EPS geofoam densities namely 12 kg/m3 and 15 kg/m3 and two different geofoam thicknesses 0.107H and 0.143H were used for static analysis. Three different surcharge loading namely 10 kPa,30kPa and 50kPa which were kept at a distance of 2.0 m away from the wall face. In the static analysis earth pressure distribution for wall with and without geofoam were analyzed. Approximately 50% isolation efficiency was reported. At lower surcharge loads the effectiveness of EPS is more as compare to higher surcharge load and with increase in surcharge load, isolation efficiency gradually decreases and isolation efficiency decreases with increase in buffer modulus. Apart from these serviceability criteria was also checked. Serviceability criteria comprise of lateral deformation of EPS geofoam at sand-geofoam interface and backfill surface settlement were studied. Lower EPS geofoam density and higher EPS geofoam thickness reduces higher magnitude of earth pressure but in this combination the backfill surface settlement was coming very high.
使用 EPS 土工泡沫对悬臂式挡土墙进行数值建模
挡土墙结构是常见的土木工程结构。估算不同附加荷载条件下挡土墙结构所承受土压力的大小和分布至关重要,因为它们会影响挡土墙结构的设计和整体经济性。使用有限元代码 PLAXIS 进行数值建模,并进行静态分析。研究了高度为 7 米的非屈服悬臂挡土墙(含 EPS 土工泡沫结构和不含 EPS 土工泡沫结构),并考虑了 20 米的回填宽度。在本研究中,回填土按莫尔-库仑屈服标准建模,EPS 土工泡沫和墙体按线性弹性建模。EPS 土工泡沫密度分别为 12 kg/m3 和 15 kg/m3,两种不同的土工泡沫厚度分别为 0.107H 和 0.143H,用于静态分析。在距离墙面 2.0 米处分别施加了 10kPa、30kPa 和 50kPa 三种不同的附加荷载。在静态分析中,分析了有土工泡沫和无土工泡沫墙体的土压力分布。据报告,隔离效率约为 50%。在较低的附加荷载下,与较高的附加荷载相比,发泡聚苯乙烯的效果更好;随着附加荷载的增加,隔离效率逐渐降低,并且随着缓冲模量的增加,隔离效率也会降低。除此以外,还检查了适用性标准。适用性标准包括 EPS 土工泡沫在砂-土工泡沫界面的横向变形和回填表面沉降。较低的发泡聚苯乙烯(EPS)土工泡沫密度和较高的发泡聚苯乙烯(EPS)土工泡沫厚度可降低较高的土压力,但在这种组合下,回填土表面沉降非常大。
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