Currently, seams of PE membrane are fused and seams of non-woven geo-fabric are sewed for joining of membrane and non-woven geo-fabrics. The test results indicate that tensile failure strength of the bonded seams is only 20 %~40 % of the tensile strength of parent materials. On the basis of a series of experimental study, a new method is proposed for strengthening the seams of geomembrane and geo-fabrics. With the new method, KS hot melt adhesive is used for binding seams of PE membrane and non-woven geofabric and seams of non-woven geofabric following welding of PE membrane. Being strengthened with KS hot melt adhesive the tensile failure strength of the bonded seams could be similar to the tensile strength of parent materials, which satisfies technical requirement that tensile strength of seams should not be lower than 80 % of the tensile strength of parent materials as specified in Standard for Application of Geosynthetics in Hydraulic and Hydro-power Engineering.%目前两布一膜型PE复合土工膜施工中多采用膜焊接、非织造土工布缝合的接缝方法,测得接缝拉伸断裂强度仅为母材强度的20％～40％.在试验研究基础上提出了膜焊接后,膜与非织造土工布、非织造土工布与非织造土工布之间采用KS热熔胶粘剂粘合的接缝加固方法.加固后的接缝强度接近母材强度,满足SL/T 225-98《水利水电工程土工合成材料应用技术规范》中,接缝强度不低于母材强度80％的技术要求.
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