Preparation of Paste Filling Body and Study on Supported Transportation Laws Using Flac3D Simulation

被引:0
|
作者
Wu, Pengfei [1 ]
Gao, Zhenbo [1 ]
Jin, Jiaxu [1 ]
Lian, Fengmei [1 ]
Li, Yanfeng [2 ]
Liu, Tao [1 ]
机构
[1] Liaoning Tech Univ, Sch Civil Engn, Fuxin 123000, Peoples R China
[2] Shenyang Jianzhu Univ, Sch Transportat & Geomatics Engn, Shenyang 110168, Peoples R China
基金
中国国家自然科学基金;
关键词
GFB; early strength; Flac3D numerical simulation; abutment pressure; overburden migration law; BEHAVIOR; BACKFILL;
D O I
10.3390/coatings14060743
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This paper proposes a new type of gangue filling body (GFB) to address the issues of the low stability, strength, poor shrinkage performance, and inadequate seepage resistance of paste filling materials in overburdened mining conditions, as well as the challenge of fully utilizing solid waste gangue. The coal gangue (CG), U-expanding agent (UEA), and amount of water added were kept constant, and the mass ratio of the various components was adjusted to the design. The standard for filling was assessed using slump tests, uniaxial compression tests, shrinkage tests, and penetration tests. A further microscopic analysis of the pastes with an optimal filling performance was conducted using SEM. The support pressure and overburden migration patterns in the GFBs were evaluated using Flac3D. The results indicate that the GFB with ratio 4 performed best, highlighting the significant role of Portland cement (OPC). The GFB with ratio 3 demonstrated the second-best performance, suggesting that GFBs with a higher early strength should be chosen to fill hollow zones for an effective filling outcome. This study introduced a new type of paste filling material and confirmed the rock transport law of this material under overburdened conditions using Flac3D, offering significant insights for the engineering field.
引用
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页数:16
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