袋装石土工袋剪切力学特性试验研究

袋装石土工袋堆叠过程中在土工袋接触面形成的咬合和嵌固作用,对土工袋剪切力学强度和破坏形式有较大的影响。通过一系列直剪试验研究了咬合和嵌固作用的影响,试验结果表明:袋装石土工袋层间咬合和嵌固作用能够增大土工袋抗剪强度;咬合作用随着土工袋上部竖向应力的增大有所减小,而嵌固作用则有所增大;袋装石土工袋在剪切过程中会产生两种破坏形式,分别为土工袋袋体自身变形和层间滑动破坏;土工袋组合体在受到水平剪切力时会发生整体变形,随后在组合体内部产生阶梯型滑动面,滑裂面的形状随着竖向荷载的增大而有所不同,相应的抗剪强度也会随着滑动面的改变而变化。

Experimental study on shearing characteristics of pebbles-filled soilbags

Interlayer insertion and interlock will be formed when the pebbles-filled soilbags are stacked vertically and staggered, which will affect the shearing strength and failure modes of the stacked soilbags. A series of shear tests on stacked soilbags filled with pebbles was conducted to show that the interlayer insertion and interlock can strengthen the shear strength of the stacked pebbles- filled soilbags. The insertion increases as the applied normal stress increases while the interlock decreases slightly. There are two shearing failure modes of the stacked pebbles-filled soilbags during the shearing including deformation failure of filling materials (occurs first), and followed by interlayer sliding failure. For the five layers of staggered arranged pebbles-filled soilbags, deformation of stacked soilbags will also happen before the interlayer sliding. The sliding surface of staggered arranged soilbags is ladder-like due to the interlayer insertion. Additionally, the interlayer friction resistance of the five layers of soilbags filled with pebbles is found to be related to the shape of the sliding surface.