Abstract
Waterproof membranes have higher initial strength, faster construction, and better waterproofing than conventional sheet membranes. In addition, their polymer constituents have much higher interfacial adhesion and tensile strength than those of conventional materials. However, despite their advantages, waterproof membranes are not widely used in civil construction. This study evaluates the material properties and interface parameters of a waterproof membrane by considering the results of laboratory experiments and numerical analysis. Since the contact behavior of a membrane at its interface with shotcrete is important for understanding the mechanism of the support it offers known as a shotcrete tunnel lining, modeling should adopt appropriate contact conditions. The numerical analysis identifies the suitability and contact conditions of the waterproof membrane in various conditions.
Highlights
Waterproofing both new and existing underground structures is an economical and effective way to increase their design life
Criteria for the thin spray-on liners (TSLs) by EFNARC (European Federation of National Associations Representing for Concrete) [10] is focused on its mechanical properties while criteria for the waterproof membrane by ITA
The tangential behavior was analyzed here based on the direct shear test results for this The tangential behavior was analyzed here based on et theal., direct shear results Figure for this 4a waterproof waterproof membranebehavior and shotcrete obtained by Park thetest setup
Summary
Waterproofing both new and existing underground structures is an economical and effective way to increase their design life. A TSL has a very similar composition for a waterproof membrane but generally shows much higher structural performance because of its function for supporting material. Criteria for the TSL by EFNARC (European Federation of National Associations Representing for Concrete) [10] is focused on its mechanical properties while criteria for the waterproof membrane by ITA Lee et al [8] used a simple numerical method to compare the performance of the waterproof membrane with conventional TSL as a support material and reported that contact condition between membrane and concrete lining had a relatively large effect on tensile behavior. The construction location of the waterproof membrane was set as a case, and the tunnel cross-section analysis was performed to analyze the stability. The stability of a section of tunnel structure with a membrane and shotcrete lining was assessed based on the permissible values of flexural compressive stress, flexural tensile stress, and shear stress
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