不同袋内材料对土工袋单元体静动力剪切特性的影响

Influence of different filling materials on monotonic and cyclic direct shear behaviors of single soilbag

为了进一步研究不同袋内填充材料对土工袋单元体在静动力作用下剪切特性的影响,采用室内大型剪切系统对不同袋内填充材料土工袋单元体进行了一系列单剪试验和循环剪切试验。结果表明:土工袋单元体表现出的剪切变形规律基本符合摩尔-库仑屈服准则,其抗剪强度主要由土工袋表面张力和袋内土体颗粒之间的摩擦力共同提供;不同袋内填充材料对土工袋单元体的剪切变形特性有一定的影响,相对于壤土土工袋、碎石土工袋,天然河砂土工袋单元体的抗剪强度、阻尼消能效果与抵抗变形的能力均相对更好,因此从抗剪强度及减振消能特性的角度看,实际减隔震工程中采用河砂装填是一个较好的选择。

In order to further investigate the static and dynamic characteristics of single soilbag filled with different materials, a series of simple shear tests and cyclic shear tests were performed through a large indoor shear apparatus. The test results show that the shear behavior of single soilbag follows the Mohr-Coulomb failure criterion basically, and its shear-resistant properties is mainly provided by the surface tension of the soilbag and the friction between soil particles in the soilbag. Different filling materials have a certain influence on the shear characteristics of single soilbag. By comparing the static and dynamic characteristics of single soilbag filled with river sand, loam and gravel respectively, it can be found that the single soilbag filled with river sand has the best shear performance, vibration and energy reduction effect, and deformation resistance ability. Therefore, it’s a good choice to use river sand as a common building material for loading in practical earthquake isolation engineering, from the perspective of shear resistance, vibration reduction and energy dissipation characteristics of single soilbag.