Year: 2025
Type: article
Abstract: In tunnel structures that traverse active fault zones, a vibration isolation layer is often installed between the primary support and the secondary lining. As a result, a three-layer flexible support structure composed of the initial support, damping layer, and secondary lining is formed. Currently, there is limited research on the mechanical behavior of interlayer interfaces. To address this, mechanical performance tests were conducted on composite specimens under compression-shear conditions, including foam concrete paired with C30 ordinary concrete (PC specimens) and foam concrete paired with Engineered Cementitious Composites (PE specimens). The interfacial shear mechanical properties under varying normal loads were analyzed. The results indicate that the shear mechanical properties of both PC and PE interfaces increase with rising normal stress. Under identical normal stress conditions, the PC interface exhibits higher shear strength, shear modulus, and shear-slip energy compared to the PE interface, but its failure displacement is smaller. When the normal stress increases from 0 MPa to 2 MPa, the interfacial shear strength of PC specimens increases by 1.6 times, while that of PE specimens increases by 2.7 times. The residual shear strength of the PC specimens and PE specimens increased by 6.1 times and 15.3 times, respectively. B Established the maximum shear strength formulas for PC specimens and PE specimens. These findings provide a scientific basis for the design of tunnel shock-absorbing layers and ductile linings.
Source: Buildings
Authors: Runtao Li, Zude Ding, Shunguo Wang, Juan Huang, Caipeng Zhu
Language: English
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,137
Award: G4545502998
OpenAlex ID: W4410211542