采动应力与采空区压实承载耦合分析方法研究

发布时间：2018-07-24 18:41

【摘要】：采空区垮落带在覆岩沉降作用下的应力恢复对采动应力场有显著影响。基于围岩应力与采空区压实承载的耦合作用,研究了垮落带岩体压实承载的力学特性及参数反演方法,分析了裂隙带岩体的拉伸劣化力学特性,提出了采动应力场与采空区压实承载耦合分析方法,通过实例仿真模拟分析进行了验证。研究表明:垮落带渐进压实承载的力学特性是指数型表达式,压缩刚度随压缩应变呈非线性增长。由双屈服本构模型反演得到与理论解拟合度较好的垮落带力学参数,实现了垮落带压实承载特性的仿真模拟。裂隙岩体劣化系数表达式反映了模量劣化特性,应变软化本构模型增加模量劣化算法组成岩体劣化本构模型,实现了应变软化和裂隙岩体模量劣化的动态分析,较真实严谨的反映裂隙带岩体的力学特性。基于垮落带与裂隙带特征的仿真模拟,实现了采动应力场与采空区覆岩"两带"特征的耦合分析。通过工作面支承压力场演化特征的实例仿真分析,验证了采动应力场与采空区压实承载耦合分析方法的可行性和正确性,提高了采动应力场和围岩采动响应研究的严谨性和可靠性。
[Abstract]:The stress recovery of the caving zone in goaf under the action of overburden subsidence has a significant effect on the mining stress field. Based on the coupling effect between surrounding rock stress and compaction bearing capacity in goaf, the mechanical characteristics and parameter inversion method of rock compaction bearing in caving zone are studied, and the mechanical properties of tensile degradation of rock mass in fractured zone are analyzed. The coupling analysis method between the mining stress field and the compaction load of goaf is proposed, which is verified by an example. The results show that the mechanical properties of progressive compaction in caving zone are exponential expressions, and the compression stiffness increases nonlinear with compressive strain. The mechanical parameters of the collapse zone are obtained by inversion of the double yield constitutive model and the mechanical parameters of the collapse zone are obtained, and the simulation of the compaction load characteristics of the collapse zone is realized. The expression of the deterioration coefficient of fractured rock mass reflects the characteristic of modulus deterioration, and the strain softening constitutive model increases the modulus deterioration algorithm to form the rock mass degradation constitutive model, which realizes the dynamic analysis of strain softening and modulus deterioration of fractured rock mass. It reflects the mechanical characteristics of fractured rock mass more accurately and truthfully. Based on the simulation of the characteristics of caving zone and fracture zone, the coupling analysis of mining stress field and "two zones" characteristics of overburden in goaf is realized. The feasibility and correctness of the coupling analysis method of mining stress field and goaf compaction bearing capacity are verified by the simulation analysis of the evolution characteristics of supporting pressure field in working face. The precision and reliability of mining stress field and mining response of surrounding rock are improved.
【作者单位】：山东科技大学矿山灾害预防与控制国家重点实验室培育基地;山东科技大学矿业与安全工程学院;
【基金】：国家自然科学基金资助项目(51704182) 山东省自然科学基金资助项目(ZR2017BEE050) 山东省高等学校科技计划资助项目(J17KA212)
【分类号】：TD323

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