吉林建筑大学学报

土工格室作为三维土工合成材料，可有效减缓结构体沉降和变形，但土工格室与土体相互作用特性复杂，筋土界面剪切特性尚不明确。采用自主研制的DW1280L电液伺服直剪拉拔试验系统进行大型叠环式剪切试验，研究不同法向应力条件下原型土工格室界面剪切特性；基于大型叠环剪切试验参数建立三维界面剪切数值模型进行对比分析。叠环式剪切试验得到土工格室与填料的界面强度为31.6 kPa，内摩擦角为26.5°，距离剪切面5 cm和55 cm处叠环水平位移分别为33.9 mm和10.5 mm。分析表明，随着土工格室高度的增加，土工格室-砂土界面剪切强度和影响范围逐渐增大，并且增大土工格室模量和填料强度均可提高加筋土的抗剪强度，对内摩擦角影响较小，黏聚力影响较大。

As a three-dimensional geosynthetic material, geocell can effectively reduce the settlement and deformation of the structure. However, the interaction between geocell and soil is complicated, and the interfacial shear characteristics of reinforced soil are not clear. The self-developed DW1280L electro-hydraulic servo direct shear and drawing test system was used to conduct large-scale stacked ring shear tests to study the interface shear characteristics of the prototype geocell under different normal stress conditions. A three-dimensional interface shear numerical model was established based on the parameters of large-scale cyclic shear test. The large-scale stacked ring shear test obtained that the interface strength between geoglage chamber and filler was 31.6 kPa, the internal friction angle was 26.5°, and the horizontal displacement of the folded ring at 5 cm and 55 cm away from the shear plane was 33.9 mm and 10.5 mm, respectively. The analysis shows that the shear strength and influence range of the geocellsand interface gradually increase with the increase of the geocell height, and the increase of the geocell modulus and the strength of the filler can improve the shear strength of the reinforced soil, but the influence of the internal friction angle is small, and the influence of the cohesion is larger.