采動(dòng)應(yīng)力與采空區(qū)壓實(shí)承載耦合分析方法研究
[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.
【作者單位】: 山東科技大學(xué)礦山災(zāi)害預(yù)防與控制國家重點(diǎn)實(shí)驗(yàn)室培育基地;山東科技大學(xué)礦業(yè)與安全工程學(xué)院;
【基金】:國家自然科學(xué)基金資助項(xiàng)目(51704182) 山東省自然科學(xué)基金資助項(xiàng)目(ZR2017BEE050) 山東省高等學(xué)?萍加(jì)劃資助項(xiàng)目(J17KA212)
【分類號(hào)】:TD323
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