深部充填开采留巷球应力壳与偏应力场演化及协同控制

项目名称： 深部充填开采留巷球应力壳与偏应力场演化及协同控制

项目编号： No.51504259

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 矿业工程

项目作者： 谢生荣

作者单位： 中国矿业大学（北京）

项目金额： 20万元

中文摘要： 针对深部充填开采沿空留巷围岩所处的复杂特殊环境，分析其覆岩体活动特征及其与岩体环境的力学响应关系，进而基于球应力与各主应力之间的关系，研究深部充填开采留巷扰动围岩三维球应力壳形成与分布特征，揭示球应力壳对覆岩体活动的控制作用和下部留巷工程的保护机制。探讨深部留巷球应力壳下煤岩体分区破裂形式及其与球应力壳下沉的关系，研究球应力壳下偏应力场、围岩畸变能积累与耗散的时空演化规律，阐明其对深部留巷围岩畸变的主控作用。建立非均布受载充填体、巷旁支架与弱结构煤帮协同支撑的围岩结构模型，揭示采空区整体充填、巷旁和巷内支护对深部留巷围岩协同控制作用机理。探究采空区充填对球应力壳反作用机理和围岩分区破裂的弱化作用机制以及巷内支护对围岩的维稳和弱面补偿作用，形成深部充填开采沿空留巷围岩协同控制技术关键与参数优化方法，为深部留巷围岩稳定性控制提供关键理论和技术保障。

中文关键词： 三维球应力壳；偏应力场；时空演化；分区破裂；结构模型

英文摘要： For the complicated environment of deep gob-side retaining entries’ surrounding rock, mechanical response relationship between surrounding rock behavior and rock environment will be analyzed, and furthermore, based on the relevance between spherical stress and each principal stress, the forming and distribution feature of three-dimensional spherical stress shell influenced immediately by deep gob-side retaining entries disturbing action will be studied as well. And then, the controlling effect of spherical stress shell to overlying strata behavior and the protecting mechanism to lower retaining entries will be illustrated. The relationship between zonal rupture forms of coal-rock covered by the shell and spherical stress subsidence in deep retaining entries will be researched. In addition, space-time evolution law of deviator stress filed and accumulation and dissipation of surrounding rock distortion energy will be investigated as well, and then the principle control mechanism of such evolution law to deep surrounding rock distortion will be demonstrated. Collaborative support structural model consists of non-uniform loaded filling body, roadside support and weak-structured coal sides will be established, in addition, the collaborative control mechanism of integral backfilling in gob, road-side and road-in support of deep retaining entries will be revealed. Besides, reaction mechanism of gob filling to spherical stress shell and the weaken effect to coal-rock zonal rupturing process will be investigated, and so will be the stability maintenance and compensation effect to weak interface of road-in support. Furthermore, the key collaborative control technique of deep retaining entries and its parameter optimization methods will be proposed, which will provide key theoretical and technical support for stability control of surrounding rock in deep retaining entries.

英文关键词： 3D spherical stress crust;deviator stress field;space-time evolution;zonal rupture;structural model