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尾砂胶结充填体的损伤破坏及其与岩体的合理匹配(英文) 预览 被引量:5

Damage failure of cemented backfill and its reasonable match with rock mass
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摘要 为了研究充填体的破坏机理及其与岩体的合理匹配,实现金属矿山的安全高效开采,分別对灰砂配比为0.250:1、0.125:0、0.100:1和0.083:1的4种尾砂胶结充填体进行试块单轴抗压实验。通过其应力-应变曲线,分析不同灰砂配比下充填体的变形与破坏特征。在此基础上,采用损伤力学推导建立4种不同配比充填体的损伤本构方程,并通过本构模型与实验结果的对比分析,验证损伤模型的可靠性。此外,利用突变理论,建立充填体与岩体在相互力学作用下的能量模型,推导出充填体与岩体的系统失稳判据。结果表明:不同配比的充填体表现出不同的损伤特性,充填体灰沙配比越低,达到峰值应力时的损伤值越小,且峰值应力后,损伤破坏过程越明显;从系统失稳的条件上看,岩体强度与充填体强度越低,越容易造成系统的失稳。该研究结果为矿山充填体合理强度设计提供了科学依据。 In order to study the failure mechanism of backfill and the reasonable matches between backfill and rock mass, and to achieve the object of safe and efficient mining in metal mine, four types of backfills were tested under uniaxial compression loading, with cement?tailing ratios of 0.250:1, 0.125:1, 0.100:1 and 0.083:1, respectively. With the help of the stress?strain curves, the deformation and failure characteristics of different backfills with differing cement?tailing ratios were analyzed. Based on the experimental results, the damage constitutive equations of cemented backfills with four cement?tailing ratios were proposed on the basis of damage mechanics. Moreover, comparative analysis of constitutive model and experimental results were made to verify the reliability of the damage model. In addition, an energy model using catastrophe theory to obtain the instability criteria of system was established to study the interaction between backfill and rock mass, and then the system instability criterion was deduced. The results show that there are different damage characteristics for different backfills, backfills with lower cement?tailing ratio tend to have a lower damage value when stress reaches peak value, and damage more rapidly and more obviously in failure process after peak value of stress; the stiffness and elastic modulus of rock mass with lower strength are more likely to lead to system instability. The results of this work provide a scientific basis for the rational strength design of backfill mine.
作者 刘志祥 兰明 肖思友 郭虎强 Zhi-xiang LIU;Ming LAN;Si-you XIAO;Hu-qiang GUO;School of Resources and Safety Engineering,Central South University
出处 《中国有色金属学报:英文版》 SCIE EI CAS CSCD 2015年第3期954-959,共6页 Transactions of Nonferrous Metals Society of China
基金 Projects(2013BAB02B05,2012BAB08B01)supported by the National Science and Technology Support Program of China Project(2013JSJJ029)supported by the Teacher Foundation of Central South University,China Project(51074177)supported by the Joint Funding of National Natural Science Foundation and Shanghai Baosteel Group Corporation,China
关键词 尾砂胶结充填体 岩体 损伤本构方程 突变理论 匹配 失稳判据 cemented tailings backfill rock mass damage constitutive equation catastrophe theory match instability criterion
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参考文献15

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