A damage model of rock-concrete composite in coal mine underground reservoirs

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

Construction and Building Materials Pub Date : 2024-11-15 DOI:10.1016/j.conbuildmat.2024.139046

Tenglong Rong , Jiawei Wang , Lujun Wang , Sheng Zhang , Xiaojian Ren , Yilu Yang , Yijia Zhou

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Abstract

In order to ensure the stability of rock-concrete composite (RCC) in coal mine underground reservoirs (CMURs), the theoretical damage model of the RCC was constructed in the present work. Considering the deformation compatibility between two different media of RCC on loading, the damage variable of RCC is deduced based upon the relationship between the damage variables of rock and concrete following the strain equivalence principle. Adjudging the failure of rock and concrete by different strength criteria, a damage model of RCC in coal mine underground reservoir (RCCD model) was developed. The experiments on the uniaxial and triaxial compressions of rock, concrete and RCC were used to validate the proposed damage model. The RCCD model curves exhibited four different periods in triaxial compression. The correlation coefficients between the values of RCCD model and the test values were determined to be 0.959, 0.981, 0.998 and 0.996. In addition, the correlation coefficients of rock and concrete were higher than 0.959. Moreover, the correlation of the parameters in the RCCD model was analyzed. The sensitivity of Weibull distribution parameters, height ratio coefficient, elastic modulus ratio and tension compression ratio of RCC were discussed. The study illustrates that the proposed RCCD model can satisfactorily characterize the mechanical characteristics of RCC under various loadings.

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煤矿地下水库岩石-混凝土复合材料的破坏模型

为了确保煤矿地下水库（CMURs）中岩石-混凝土复合材料（RCC）的稳定性，本研究构建了 RCC 的理论损伤模型。考虑到 RCC 两种不同介质在加载时的变形相容性，根据应变等效原理，根据岩石和混凝土的损伤变量之间的关系推导出 RCC 的损伤变量。根据不同的强度标准对岩石和混凝土的破坏进行判断，建立了煤矿地下水库中 RCC 的破坏模型（RCCD 模型）。岩石、混凝土和 RCC 的单轴和三轴压缩实验验证了所提出的破坏模型。RCCD 模型曲线在三轴压缩中表现出四个不同的周期。经测定，RCCD 模型值与测试值之间的相关系数分别为 0.959、0.981、0.998 和 0.996。此外，岩石和混凝土的相关系数均高于 0.959。此外，还分析了 RCCD 模型中各参数的相关性。讨论了 RCC 的 Weibull 分布参数、高度比系数、弹性模量比和拉压比的敏感性。研究结果表明，所提出的 RCCD 模型可以令人满意地描述 RCC 在各种荷载下的力学特性。

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

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.