深部开采动静载荷作用下复合动力灾害致灾机理研究

发布时间：2018-03-10 14:30

本文选题：真三轴应力　切入点：深部开采　出处：《煤炭学报》2017年09期 　论文类型：期刊论文

【摘要】：为研究深部开采动静载荷条件下冲击地压、突出两种灾害相互作用形成的复合动力灾害的发生条件与显现特征,利用重庆大学自主研发的"多功能真三轴流固耦合试验系统",以层状复合煤岩体为研究对象,进行了改变静应力组合、交变载荷频率和幅值、应变率及气体压力等试验条件的系列真三轴试验。试验结果表明:中间主应力、气体压力、交变频率和幅值、应变率等对复合动力灾害的显现特征均有较大的影响;真三轴试验条件下,层状复合煤岩体在临空面一侧多以劈裂成板、板曲折断的层裂形式破坏;基于荷载类型,可将复合动力灾害分为高静载型、扰动型、冲击型复合动力灾害3种类型,且在各类复合型动力灾害中,高压气体对复合动力灾害的孕育和发生具有积极的作用。
[Abstract]:In order to study the occurrence conditions and manifestation characteristics of the composite dynamic disasters formed by the interaction of two kinds of disasters under the condition of dynamic and dynamic loads of deep mining, The multifunctional true triaxial fluid-solid coupling test system developed by Chongqing University is used to study the stratified composite coal and rock mass. The static stress combination, alternating load frequency and amplitude are changed. A series of true triaxial tests on strain rate and gas pressure. The results show that the intermediate principal stress, gas pressure, alternating frequency and amplitude, strain rate have great influence on the characteristics of composite dynamic disaster. Under the condition of true triaxial test, the layered composite coal and rock mass can be broken in the form of split plate and broken plate on the side of the face of the air, and based on the load type, the composite dynamic disaster can be divided into Gao Jing type and disturbance type, and the composite dynamic disaster can be divided into two types: Gao Jing type and disturbance type. There are three types of composite dynamic disasters of impact type, and among them, high pressure gas plays a positive role in the preparation and occurrence of complex dynamic disasters.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点试验室;重庆大学资源及环境科学学院;重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室;
【基金】：国家自然科学基金资助项目(51434003,51374256)
【分类号】：TD771

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