Abstract This paper presents a series of model tests on geosynthetic-reinforced soil (GRS) foundations across a normal fault. The aim was to evaluate the performance of reinforced foundations as a mitigation measure for surface faulting hazards. Experimental tests modeled a 3-m thick foundation in prototype subjected to a fault displacement up to 90 cm. Test variables included the number of reinforcement layers, reinforcement stiffness and location, and foundation height. Digital image analysis techniques were applied to determine the ground settlement profile, angular distortion, shear rupture propagation, and mobilized reinforcement tensile strain at various magnitudes of fault offset. Test results revealed that compared with the unreinforced foundation, reinforcement inclusion could effectively prevent the shear rupture propagating from the bedrock fault to the ground surface. It also spread the differential settlement to a wider influential zone, resulting in an average reduction of 60% in the fault-induced angular distortion at the ground surface. The maximum angular distortion decreased as the foundation height, number of reinforcement layers, and reinforcement stiffness increased. Relationships between the maximum angular distortion and maximum mobilized reinforcement tensile strain with fault displacement were therefore established. Based on the findings from this study, design suggestions and implications are discussed.

中文翻译：

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跨越正断层的土工合成材料加筋地基的性能

摘要 本文介绍了横跨正断层的土工合成材料加筋土 (GRS) 地基的一系列模型试验。目的是评估加固地基作为地表断层危害缓解措施的性能。实验测试模拟了原型中 3 米厚的基础，该基础受到高达 90 厘米的断层位移。测试变量包括钢筋层数、钢筋刚度和位置以及基础高度。应用数字图像分析技术来确定在各种断层偏移量下的地面沉降剖面、角度畸变、剪切破裂传播和移动钢筋拉伸应变。试验结果表明，与无钢筋地基相比，钢筋包裹体可以有效阻止剪切破裂从基岩断层向地表传播。它还将差异沉降扩散到更广泛的影响区域，导致地表断层引起的角畸变平均减少 60%。最大角畸变随着基础高度、钢筋层数和钢筋刚度的增加而减小。因此，建立了最大角变形和最大移动钢筋拉伸应变与断层位移之间的关系。根据本研究的结果，讨论了设计建议和影响。导致地表断层引起的角畸变平均减少 60%。最大角畸变随着基础高度、钢筋层数和钢筋刚度的增加而减小。因此，建立了最大角变形和最大移动钢筋拉伸应变与断层位移之间的关系。根据本研究的结果，讨论了设计建议和影响。导致地表断层引起的角畸变平均减少 60%。最大角畸变随着基础高度、钢筋层数和钢筋刚度的增加而减小。因此，建立了最大角变形和最大移动钢筋拉伸应变与断层位移之间的关系。根据本研究的结果，讨论了设计建议和影响。