本文選題：長期強(qiáng)度 + 時(shí)效變形��； 參考：《地下空間與工程學(xué)報(bào)》2017年03期

【摘要】：依據(jù)對巖石長期強(qiáng)度的認(rèn)識,基于環(huán)境因素影響下巖石強(qiáng)度、彈模等物理力學(xué)性質(zhì)隨時(shí)間劣化及其內(nèi)部細(xì)觀損傷積累等觀點(diǎn),應(yīng)用RFPA數(shù)值模擬方法,模擬了隧洞圍巖的時(shí)效破壞過程,并與相應(yīng)的物理模型試驗(yàn)結(jié)果進(jìn)行了對比。隧洞數(shù)值模擬試驗(yàn)得到了拱頂、拱底以及兩側(cè)幫的時(shí)效變形特征曲線,與實(shí)際物模試驗(yàn)結(jié)果表現(xiàn)出了較好的一致性,并且發(fā)現(xiàn)隧洞圍巖宏觀破壞是細(xì)觀損傷實(shí)時(shí)演化及逐步積累的最終表現(xiàn)。進(jìn)一步模擬分析了側(cè)壓系數(shù)對隧洞時(shí)效變形破壞特性的影響,模擬結(jié)果顯示,隨著側(cè)壓系數(shù)的增大,隧洞左右邊墻間的閉合位移逐漸增大,而隧洞拱頂拱底間的收斂位移隨側(cè)壓系數(shù)的增大逐漸減小,并對隧洞圍巖的局部的細(xì)觀損傷演化過程及宏觀時(shí)效破壞模式做出了清晰的解釋。
[Abstract]:Based on the understanding of the long-term strength of rock, based on the view that the physical and mechanical properties of rock such as strength, modulus of elasticity and other physical and mechanical properties deterioration with time and the accumulation of internal meso-damage under the influence of environmental factors, the RFPA numerical simulation method is applied. The aging failure process of tunnel surrounding rock is simulated and compared with the corresponding physical model test results. The characteristic curves of aging deformation of arch roof, arch bottom and both sides of tunnel are obtained by numerical simulation test of tunnel, which is in good agreement with the result of actual physical model test. It is also found that the macroscopic damage of tunnel surrounding rock is the final manifestation of the real time evolution and gradual accumulation of mesoscopic damage. Furthermore, the influence of lateral pressure coefficient on the aging deformation and failure characteristics of tunnel is analyzed. The simulation results show that with the increase of lateral pressure coefficient, the closing displacement between the left and right side walls of the tunnel increases gradually. However, the convergent displacement between the arch bottom of the arch top of the tunnel gradually decreases with the increase of the lateral pressure coefficient, and the evolution process of the local meso-damage and the macroscopic time-dependent failure mode of the surrounding rock of the tunnel are explained clearly.
【作者單位】： 大連理工大學(xué)土木工程學(xué)院;
【基金】：安徽省科技計(jì)劃項(xiàng)目(1604a0802109) 國家重點(diǎn)基礎(chǔ)研究計(jì)劃973項(xiàng)目(2014CB047103) 國家自然科學(xué)基金資助項(xiàng)目(51279024)
【分類號】：U451.2

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