This study investigated the effect of fibre reinforcement on the large strain behaviour of compacted clay samples tested using large triaxial test equipment. A novel specimen preparation method was proposed where peds of clay are compacted to closely simulate the in-situ compaction. A large number of 100 × 200 mm triaxial tests and one-dimensional compression tests were performed using reinforced and unreinforced samples. The behaviour of unreinforced samples was observed to be similar to highly fissured clays; ped compaction generated a random fissure pattern due to the contact between peds. The addition of fibres to the compacted samples created fissures with higher mobility at lower friction than those in the unreinforced samples; hence, the state boundary surface of reinforced clay was below that of the unreinforced clay. With the addition of fibres, the failure mechanism changed from the formation of a shear plane to barrelling, demonstrating that the fibres transferred stresses further away from the shear plane, producing a more homogeneous stress distribution. The preparation method proposed here produced a fissure pattern in the clay that introduced transitional behaviour, which was drastically reduced with addition of the fibres, allowing better normalisation and the definition of a unique boundary surface.

本研究调查了纤维增强对使用大型三轴测试设备测试的压实粘土样品的大应变行为的影响。提出了一种新的试样制备方法，其中压实粘土块以密切模拟原位压实。使用增强和未增强样品进行了大量的 100×200 mm 三轴试验和一维压缩试验。观察到未增强样品的行为类似于高度裂隙的粘土；由于 peds 之间的接触，ped 压实产生了随机的裂缝模式。与未增强样品相比，在压实样品中添加纤维产生的裂缝在较低摩擦下具有更高的流动性；因此，增强粘土的状态边界面低于未增强粘土的状态边界面。随着纤维的加入，破坏机制从剪切面的形成变为滚桶，表明纤维将应力转移到远离剪切面的地方，产生了更均匀的应力分布。这里提出的制备方法在粘土中产生了一种裂缝模式，该模式引入了过渡行为，随着纤维的加入，这种行为会大大减少，从而实现更好的归一化和独特边界表面的定义。