This study investigates the quasi-static bearing stress-settlement response of shallow foundations in monolithic tire derived aggregate (TDA) layers having a total thickness of 3 m using a large-scale container and loading system. Tests were performed on footings having a range of widths, embedment depths, shapes, and loading inclinations. In tests where tilting was restricted, a clear bearing capacity was not observed for settlements up to 1.2B, where B is the footing width, but in tests where tilting was permitted bearing capacity was observed between settlements of 0.2B to 0.7B. Surface settlements indicate a dragdown response of the TDA adjacent to the footing extending out to more than 3B from the footing center, while settlement plates beneath the footing indicate a zone of influence of induced settlements of 14% at a depth of 4B. While bearing capacity theories for frictional geomaterials provided a reasonable prediction of the bearing capacity of footings in TDA for most tests, the corresponding settlements may be excessive for engineering applications. Accordingly, a correlation was developed between the theoretical bearing capacity and bearing stress at a settlement of 0.1B. A test with sustained loading indicates slight creep settlements with some stress dependency with magnitudes consistent with past studies.

中文翻译：

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轮胎衍生骨料中浅基础的响应

本研究使用大型集装箱和装载系统研究了总厚度为 3 m 的整体轮胎衍生骨料 (TDA) 层中浅基础的准静态承载应力沉降响应。测试是在具有一定宽度、嵌入深度、形状和负载倾斜度的基础上进行的。在限制倾斜的试验中，沉降达到 1.2 B时未观察到明显的承载力（其中B是基础宽度），但在允许倾斜的试验中，在 0.2 B至 0.7 B的沉降之间观察到了承载力。表面沉降表明与基础相邻的 TDA 的拖拽响应从基础中心延伸到 3 B以上，而基础下方的沉降板表明在 4 B深度处诱发沉降的影响区域为 14% 。虽然摩擦土工材料的承载力理论为大多数试验提供了 TDA 基础承载力的合理预测，但对于工程应用来说，相应的沉降可能过多。因此，在沉降为 0.1 B时理论承载力和承载应力之间建立了相关性。持续载荷测试表明存在轻微的蠕变沉降，具有一定的应力依赖性，其大小与过去的研究一致。