本文選題：非線性損傷 + 應(yīng)變能密度理論��； 參考：《巖土力學(xué)》2017年07期

【摘要】：在地下洞室、隧道等工程中,裂隙巖石峰值強(qiáng)度后的損傷破壞特性及演化機(jī)制對(duì)控制圍巖穩(wěn)定至關(guān)重要,目前,對(duì)巖石峰后的損傷破壞特性研究不充分,認(rèn)識(shí)不全面,易出現(xiàn)大體積塌方、大變形等工程事故。針對(duì)峰后裂隙巖石的力學(xué)性質(zhì),開展室內(nèi)三軸試驗(yàn),分析其非線性損傷破壞特性;假設(shè)巖石損傷滿足Weibull分布規(guī)律,引入損傷變量,推導(dǎo)出峰后裂隙巖石非線性損傷破裂本構(gòu)方程;將上述本構(gòu)方程與能量耗散原理、應(yīng)變能密度理論相結(jié)合,建立了峰后裂隙巖石的非線性損傷破壞準(zhǔn)則;采用FISH語言開發(fā)了基于上述破壞準(zhǔn)則的峰后巖石損傷破裂計(jì)算程序,用連續(xù)的方法模擬分析了峰后裂隙巖石的非連續(xù)損傷破裂過程,揭示了裂隙巖石峰后損傷破壞特性及其演化規(guī)律,并與裂隙巖石的三軸壓縮試驗(yàn)結(jié)果進(jìn)行了對(duì)比。結(jié)果表明:上述本構(gòu)方程與判別準(zhǔn)則能較好地模擬峰后裂隙巖石非線性損傷破裂過程。為有效控制圍巖穩(wěn)定提供一種新的理論分析手段。
[Abstract]:In underground cavern, tunnel and so on, the damage and failure characteristics and evolution mechanism of fractured rock after peak strength are very important to control the stability of surrounding rock. At present, the research on the damage and failure characteristics of rock after peak is not enough and the understanding is not comprehensive. Prone to large volume collapse, large deformation and other engineering accidents. According to the mechanical properties of post-peak fractured rock, the laboratory triaxial test is carried out to analyze its nonlinear damage and failure characteristics, assuming that the rock damage satisfies the Weibull distribution rule, and the damage variable is introduced. The nonlinear damage fracture constitutive equation of post-peak fractured rock is derived, and the nonlinear damage failure criterion of post-peak crack rock is established by combining the above constitutive equation with the energy dissipation principle and the strain energy density theory. Based on the above failure criterion, a program for calculating the damage and fracture of post-peak rock is developed by using FISH language, and the discontinuous damage and fracture process of post-peak fractured rock is simulated and analyzed by continuous method. The characteristics and evolution of post-peak damage and failure of fractured rock are revealed and compared with the results of triaxial compression test of fractured rock. The results show that the above constitutive equations and discriminant criteria can well simulate the nonlinear damage and fracture process of post-peak fractured rock. It provides a new theoretical analysis method for effectively controlling the stability of surrounding rock.
【作者單位】： 山東大學(xué)巖土與結(jié)構(gòu)工程研究中心;中國建筑股份有限公司技術(shù)中心;
【基金】：國家自然科學(xué)基金面上項(xiàng)目(No.51379113,No.51134001) 教育部高等學(xué)校博士學(xué)科點(diǎn)博導(dǎo)類專項(xiàng)科研基金(No.20120131110031) 山東省杰出青年基金(No.201313JQE27042) 山東省自然科學(xué)基金資助(No.ZR2013EEQ023)~~
【分類號(hào)】：TU45

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