Investigation on structure stability and damage mechanism of cemented paste backfill under the coupling effect of water-static load

IF 6.2 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY alexandria engineering journal Pub Date : 2024-11-06 DOI:10.1016/j.aej.2024.11.002
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Abstract

Cemented paste backfill (CPB) is easy to withstand the coupling effect of the mining operation equipment's crushing, water immersion, forming all kinds of intrinsic or extrinsic defects affecting its load-bearing capacity. In this paper, the initial immersion age and immersion time were used as variables, the damage and uniaxial compression characteristics of CPB under the coupling effect of water-static load were explored. Results show that the damage of water-immersed CPB under static load are mainly affected by water lubrication and pore water pressure and it improves the plastic deformation of CPB and weakens the energy storage capacity. When the initial immersion age was 3d, the effect is more significant. Water immersion increases the rate of damage with strain before peak strain and decreases the rate of damage with strain after peak strain. The strength of CPB varies from 0.3 MPa to 0.8 MPa at the same initial immersion age. The damage constitutive model of CPB under water-static load coupling is established, and the damage mechanism is revealed. Compared with the immersion time, reducing the initial immersion age is the key factor to improve the structure stability of CPB.
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水-静荷载耦合效应下水泥浆回填土结构稳定性及破坏机理研究
水泥浆回填土(CPB)容易承受采矿作业设备的破碎、水浸泡等耦合作用,形成各种影响其承载能力的内在或外在缺陷。本文以初始浸水龄期和浸水时间为变量,探讨了水-静载荷耦合作用下 CPB 的损伤和单轴压缩特性。结果表明,在静载荷作用下,浸水 CPB 的损伤主要受水润滑和孔隙水压力的影响,水润滑和孔隙水压力改善了 CPB 的塑性变形,削弱了其储能能力。当初始浸水龄为 3d 时,影响更为显著。水浸会增加峰值应变前的应变破坏率,降低峰值应变后的应变破坏率。在相同的初始浸水龄期,CPB 的强度从 0.3 MPa 到 0.8 MPa 不等。建立了水-静载荷耦合作用下 CPB 的损伤构成模型,揭示了其损伤机理。与浸泡时间相比,降低初始浸泡龄期是提高 CPB 结构稳定性的关键因素。
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来源期刊
alexandria engineering journal
alexandria engineering journal Engineering-General Engineering
CiteScore
11.20
自引率
4.40%
发文量
1015
审稿时长
43 days
期刊介绍: Alexandria Engineering Journal is an international journal devoted to publishing high quality papers in the field of engineering and applied science. Alexandria Engineering Journal is cited in the Engineering Information Services (EIS) and the Chemical Abstracts (CA). The papers published in Alexandria Engineering Journal are grouped into five sections, according to the following classification: • Mechanical, Production, Marine and Textile Engineering • Electrical Engineering, Computer Science and Nuclear Engineering • Civil and Architecture Engineering • Chemical Engineering and Applied Sciences • Environmental Engineering
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