中国安全科学学报 ›› 2018, Vol. 28 ›› Issue (12): 20-26.doi: 10.16265/j.cnki.issn1003-3033.2018.12.004

• 安全系统学 • 上一篇    下一篇

基于胶结系数岩石强化的蠕变控制模型

辛亚军1,2 副教授, 郝海春1, 吕鑫1, 姬红英3 副教授   

  1. 1 河南理工大学 能源科学与工程学院,河南 焦作 454000
    2 煤炭安全生产河南省协同创新中心,河南 焦作 454000
    3 河南理工大学 资源与环境学院,河南 焦作 454000
  • 收稿日期:2018-08-10 修回日期:2018-10-15 发布日期:2020-11-25
  • 作者简介:辛亚军 (1974—),男,河南襄城人,博士,副教授,硕士生导师,主要从事矿山压力与岩层控制方面的教学与研究。E-mail:xinyj2007@163.com。
  • 基金资助:
    国家自然科学基金资助(51674101、51174078);河南省科技攻关计划项目(172102310639);河南省高校基本科研费专项资金资助(NSFRF170919)。

Reinforcement rock creep control model based on cementation coefficient

XIN Yajun1,2, HAO Haichun1, LYU Xin1, JI Hongying3   

  1. 1 School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454000, China
    2 Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo Henan 454000, China
    3 Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo Henan 454000, China
  • Received:2018-08-10 Revised:2018-10-15 Published:2020-11-25

摘要: 深部巷道围岩破碎、注浆模式复杂、流变特性显著。探索破碎岩体胶结模式及蠕变控制模型,将利于深部巷道围岩稳定。通过对大理岩和粗砂岩进行取样—劈裂—蠕变—胶结4个步骤的制样,在RLW-2000型三轴流变仪上,对大理岩和粗砂岩2组试样进行损伤胶结强化蠕变试验,分析损伤岩石劈裂胶结强化后的基本蠕变特性,确定劈裂岩石胶结基本模式,推导基本劈裂岩石胶结强化的蠕变本构模型,并进行反演对比分析。结果表明:随着蠕变应力水平提高,大理岩蠕变应变呈缓慢增加—加速增加—急速增加过程,而粗砂岩蠕变应变呈减小—稳定—增加过程,均表现为试样裂隙的持续压密、扩展与贯通失稳;胶结岩石的胶结形态分为紧缝胶结与厚度胶结2种模式,紧缝胶结优于厚度胶结;厚度胶结的胶结厚度越大,胶结岩石体强度越大,但增幅呈衰减趋势;推导M-K-B本构模型符合胶结岩石蠕变基本特性;在同一蠕变应力水平下,随着胶结系数提高,胶结岩石蠕变应变减小,但减幅变小。

关键词: 劈裂岩石, 胶结厚度, 蠕变特性, 胶结模式, 胶结系数

Abstract: Broken surrounding rock, complex grouting ways and obvious rheology are widespread in the deep gateway. Exploring cementation mode and creep control model of broken rock body in deep gateway is beneficial to surrounding rock stability. Specimens of marble and gritstone were obtained by four steps: sampling, splitting, creep, and cementation. Creep tests of cementation reinforcement on two groups of marble specimens and gritstone ones were carried out by means of an RLW-2000 triaxial rheological system. Basic creep characteristics of splitting damaged cementation rock were analyzed. A basic cementation mode of split rock was determined. A basic creep constitutive model of split cementation rock was deduced, and the inversion analysis was carried out. The results show that as creep stress level increases continuously, creep strain of the marble will undergo a process including a slow increase stage, a rapid increase stage, and an abrupt increase stage, creep strain of the gritstone will undergo a process including a decrease stage, a stable stage, and an increase stage, and the fractures in all the specimens will be compacted continuously, extended, interconnected and failed, which results in failure, that there are two modes of rock cementation: the tight cementation and the thickness one, the tight cementation is better than thickness one, that the thicker the cementation is in thickness cementation specimen, the higher the strength of the cementation specimen will be, while the increasing trend will be damped, that the M-K-B constitutive model can reflect the basic creep characteristics of cementation rock, and that when cementation coefficient increases, the creep strain of cementation rock decreases, while the decreasing rate tends to decrease under the same creep stress level.

Key words: splitting rocks, cementation thickness, creep characteristics, cementation mode, cementation coefficient

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