摘要
南水北调中线干渠设计选用两布一膜型PE复合土工膜(PE膜厚0.30mm,上下层长丝非织造土工布各重150g/m2)整体防渗。施工中采用膜焊接、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27%。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热熔胶黏剂黏合的接缝加固方法。加固后的接缝强度达到母材强度的97%,满足《水利水电工程土工合成材料应用技术规范》SL/T 225-98中接缝强度不低于母材强度80%的技术要求。
According to the design of South-to-North Water Diversion Project （SNWDP） Mid-Route Scheme, one layer of PE membrane and two layers of PE composite geomembrane formed of filament non-woven fabric （The thickness of PE membrane is 0. 3 mm, and the weight of the upper and lower layers of the filament non-woven geofabric is 150 g/m2 , respectively） are se lected for the overall seepage control of the trunk canal. In the current constructions, seams of PE membrane are welded and seams of non-woven geofabric are sewed up. The results indicate that the tensile failure strength of the bonded seams is only 27~ of the tensile strength of the parent materials. On the basis of a series of experimental studies, a new method is proposed for strengthening the seams of geomembrane. The new method uses the KS hot melt adhesive for binding the seams of PE membrane and non-woven geofabric and binding the seams of two layers of non-woven geofabric based on the welding of PE membrane. The tensile failure strength of the bonded seams could be up to 97 ~ of tensile strength of parent materials accord- ing to the new method, which satisfies the technical requirement that the tensile strength of seams cannot be lower than 80% of the tensile strength of the parent materials as specified in the Standard for Application of Geosynthetics in Hydraulic and Hydro-power Engineering.
出处
《南水北调与水利科技》
CAS
CSCD
2011年第6期16-18,共3页
South-to-North Water Transfers and Water Science & Technology
关键词
渠道防渗
土工膜防渗
复合土工膜
土工膜铺设
接缝
KS热熔胶黏剂
土工膜黏接
PE土工膜
Canal seepage control
Seepage control with geomembrane
Composite geomembrane
Geomembrane laying
Seams
KS hot melt adhesive
Binding of geomembrane
PE geomembrane
