基于FLAC的充填体内巷道稳定性分析

doi:10.16265/j.cnki.issn1003-3033.2017.08.015

摘要/Abstract

摘要： 为探究胶结充填体内开挖巷道对其稳定性的影响,以某矿山实例为背景,应用FLAC^3D软件建立充填体模型,并利用解析解分区域验证模型的合理性。利用该模型分析巷道开挖后的充填体应力场,结合损伤理论对充填体模型的稳定性进行评价;在此基础上,分析不同高度的充填体开挖巷道后的稳定程度。研究结果表明:巷道开挖使得直墙部分和拱部产生拱形应力集中,充填体中部出现U形沉降;巷道中部直墙脚部分损伤值最高;当充填体高度达到62 m时,直墙部分最大应变约为0.003,对应的损伤值仍明显低于预警值。

关键词: 胶结充填体, 充填体内巷道, 数值模拟, 损伤力学, 稳定性分析

Abstract: To investigate the influence of excavation on the stability of cemented backfill, a model was built for backfill by using FLAC^3D software. The model's rationality was verified by analytic solution. The stress field in the backfill after excavation was analyzed with the model. And then the stability was evaluated by using the damage theory. Furthermore, the degree of stability of the backfill as a function of its height was investigated after excavation. The results show that the excavation of the tunnel makes the inner straight wall section and the arch of the tunnel produce arch stress concentration, and an U shape settlement appear in the middle of backfill, that the highest damage value appears in the central part of the straight wall, that when the height of backfill is 62 m, the maximum strain of the straight wall is about 0.003, and the corresponding damage value is still lower than the warning value.

Key words: cemented backfill, tunnel in backfill, numerical simulation, damage mechanics, stability analysis

中图分类号:

张帅帅, 尹土兵. 基于FLAC的充填体内巷道稳定性分析[J]. 中国安全科学学报, 2017, 27(8): 85-90.

ZHANG Shuaishuai, YIN Tubing. Analysis of stability of tunnel in backfill based on FLAC^3D[J]. China Safety Science Journal, 2017, 27(8): 85-90.

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