Investigation on the mechanical properties and support performance of styrene-acrylic emulsion-modified thin spray-on liners as skin support in underground engineering

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-10-13 DOI:10.1016/j.tust.2025.107165

Shuchen Li , Yong Han , Chao Yuan , Xianda Feng , Xiaotian Wang

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引用次数: 0

Abstract

Thin spray-on liners (TSLs) are recognized as critical innovations in underground engineering, offering rapid-deployment skin support for diverse geotechnical applications. However, cement-based TSLs often suffer from brittleness and limited flexibility. This study investigated the effects of styrene‒acrylic emulsions (SAEs) on the mechanical properties, crack resistance and support performance of cement-based TSLs. Two SAEs with different styrene to butyl acrylate ratios were incorporated at varying contents (0–70 % by liquid mass) into the TSL mixture. A series of mechanical and microstructure tests, including tensile, compressive, flexural, and shear strength tests, XRD, SEM, and MIP, were conducted. The results revealed that both SAEs can enhance the deformation resistance of cement-based TSLs, with SAE1 demonstrating a more pronounced improvement effect. Moreover, both SAEs improved the tensile strength and flexural strength. SAE2 outperformed SAE1 in enhancing the tensile strength (peaking at 40 % SAE2 with 3.6300 MPa) and flexural strength (8.3789 MPa at 40 % SAE2). SAE1 decreased the compressive and shear strengths, whereas SAE2 increased the compressive strength and shear strength. Microstructural analysis showed that the polymer films formed by SAEs bridged the hydration products, densified the matrix, and improved the crack resistance. Moreover, the support performance of SAE-modified TSLs was evaluated through load-bearing compression tests on TSL-coated granite. The results showed that both SAE1- and SAE2-modified TSLs can improve the peak strength and strain of flawed granite. Compared with the uncoated specimens, the TSL-coated specimens showed higher total and elastic energies, but lower brittleness indices. This study provides critical insights into SAE-modified TSLs, offering practical guidelines for optimizing underground support systems.

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苯乙烯-丙烯酸乳液改性薄喷涂衬垫作为地下工程蒙皮支架的力学性能及支护性能研究

薄型喷涂衬管（TSLs）被认为是地下工程的关键创新，为各种岩土工程应用提供快速部署的表皮支撑。然而，水泥基TSLs通常存在脆性和有限的柔韧性。研究了苯乙烯-丙烯酸乳液（sae）对水泥基TSLs力学性能、抗裂性能和支撑性能的影响。将两种不同苯乙烯与丙烯酸丁酯比例的SAEs以不同的含量（液体质量0 - 70%）加入TSL混合物中。进行了拉伸、压缩、弯曲、剪切强度测试、XRD、SEM、MIP等一系列力学和微观结构测试。结果表明，两种SAEs均能增强水泥基TSLs的抗变形能力，其中SAE1的增强效果更为明显。此外，两种SAEs都提高了拉伸强度和弯曲强度。SAE2的抗拉强度（在40% SAE2时达到峰值3.6300 MPa）和抗弯强度（在40% SAE2时达到8.3789 MPa）均优于SAE1。SAE1降低了抗压和抗剪强度，而SAE2提高了抗压和抗剪强度。微观结构分析表明，SAEs形成的聚合物薄膜架桥了水化产物，使基体致密化，提高了抗裂性能。此外，通过对涂覆tsl的花岗岩进行承载压缩试验，评价了sae改性tsl的支护性能。结果表明，SAE1-和sae2 -改性TSLs均能提高缺陷花岗岩的峰值强度和应变。与未涂覆的试样相比，涂覆tsl的试样具有更高的总能和弹性能，但脆性指数较低。该研究为sae改进tsl提供了重要见解，为优化地下支撑系统提供了实用指南。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.