模袋注浆技术因施工简便、处理范围可控、节省材料等优势已广泛应用于多种软土地基处治加固工程中。在该技术中，模袋材料抗拉性能直接决定了帷幕墙的防渗效果。为研究常用模袋材料的抗拉性能，本文选择了三种不同模袋材料开展了拉伸强度试验，得到了不同材料的破坏模式、抗拉强度和伸长率。提出了圆柱形和球形模袋简化力学模型，并据此分别建立了模袋拉伸强度与内部注浆压力之间的数学关系。研究结果可为相关工程中模袋材料选择和设计计算提供参考。
The bag grouting technology was commonly used in the soft foundation reinforcement because of the advantages of simple construction, controllable grouting and material economy. In the case of the bag grouting, the tensile strength of the mold bag is in direct relation to the seepage prevention effect of the curtain grouting. To investigate the tensile strength of the mold bag, the tensile strength tests were performed by using three different mold bags, by which the failure mechanisms, the tensile strength of mold bag and the elongations were obtained. The functional relations between the tensile strength of mold bag and the grouting pressure were developed based on the proposed mechanical models of the columniform and spherical mold bags. The results of this paper can be used for the selection of mold bag and design of the grouting pressure of bag grouting technology.
