【摘要】：采用房柱法開采石膏礦體,將石膏礦柱簡化為滿足西原模型的黏彈塑性體流變模型,采空區(qū)上部留設(shè)的護(hù)頂層簡化為彈性矩形薄板,建立了石膏礦礦柱-護(hù)頂層支撐體系的流變力學(xué)體模型。在此模型的基礎(chǔ)上推導(dǎo)了礦柱支撐下采空區(qū)護(hù)頂層受流變作用的撓度微分方程,并根據(jù)其在不同階段的邊界條件采用伽遼金方法對(duì)該微分方程進(jìn)行了求解。研究結(jié)果表明:當(dāng)作用在礦柱上的應(yīng)力σ大于極限摩阻力σ_s時(shí),石膏礦柱的塑性流變大變形將隨時(shí)間逐漸增大,極易導(dǎo)致石膏礦柱-護(hù)頂層支撐體系破裂直至坍塌;所建立的考慮礦柱流變特性的石膏礦采空區(qū)礦柱-護(hù)頂層支撐體系力學(xué)模型,可以對(duì)支撐體系的穩(wěn)定時(shí)間進(jìn)行預(yù)測。
[Abstract]:The gypsum ore body is mined by the room column method, and the gypsum pillar is simplified as the viscoelastic plastic rheological model satisfying the West original model. The retaining wall at the upper part of the goaf is simplified as the elastic rectangular thin plate, and the rheological mechanics body model of the plaster mine pillar support system is established. The differential equation of the top layer is subjected to rheological action, and the differential equation is solved by Galerkin method based on the boundary conditions at different stages. The results show that when the stress on the pillar is greater than the limit friction resistance Sigma _s, the plastic rheological deformation of the plaster pillar will gradually increase with time, and it will easily lead to gypsum. The pillar support roof support system breaks down and collapses, and the mechanical model of the gypsum mine goaf pillar support system, which takes into account the rheological characteristics of the pillar, can predict the stability time of the supporting system.
【作者單位】： 中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院大學(xué);
【基金】：國家自然科學(xué)基金面上項(xiàng)目(No.51274188)~~
【分類號(hào)】：O37
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本文編號(hào)：2157896