本文選題：損傷特性　切入點(diǎn)：非線性軟化　出處：《安徽理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：巷道開挖過程中,圍巖內(nèi)應(yīng)力重新分布并產(chǎn)生變形破壞,為保證巷道的穩(wěn)定及正常使用,有必要對(duì)其穩(wěn)定性及有效支護(hù)進(jìn)行研究。本文考慮巷道圍巖的非線性力學(xué)響應(yīng)及巖體的損傷破壞特性,從巖體內(nèi)部微裂紋產(chǎn)生和擴(kuò)展的損傷機(jī)理出發(fā),建立巖體的非線性損傷本構(gòu)模型("直線-曲線-直線"本構(gòu)模型),求得等壓荷載下圓形巷道圍巖不同區(qū)域半徑及位移的計(jì)算公式,并求出圍巖平衡方程。同時(shí),引入巷道開挖面空間效應(yīng)原理,提出分步聯(lián)合支護(hù)方案控制圍巖變形,建立圍巖-支護(hù)耦合作用的力學(xué)模型,并求得圍巖-支護(hù)相互作用實(shí)時(shí)解析解和相互作用平衡力。在此基礎(chǔ)上,通過算例分析初始損傷D0、軟化程度系數(shù)β和損傷比例系數(shù)k對(duì)塑性損傷區(qū)、流動(dòng)損傷區(qū)分布范圍、應(yīng)力分布及位移的影響,也進(jìn)一步分析了支護(hù)時(shí)機(jī)和支護(hù)強(qiáng)度對(duì)支護(hù)作用效果的影響。文中以劉莊煤礦井底車場(chǎng)的巷道群為研究工程背景,利用3DEC數(shù)值模擬軟件分析不同支護(hù)時(shí)機(jī)(模擬支護(hù)結(jié)構(gòu)距離開挖面分別0.2m、1m和2m)和不同支護(hù)強(qiáng)度(模擬三種支護(hù)方案)條件下對(duì)圍巖變形的控制效果,然后現(xiàn)場(chǎng)監(jiān)測(cè)巷道圍巖表面和深部巖體的位移量,監(jiān)測(cè)結(jié)果驗(yàn)證了研究成果的正確性。本文的研究成果可以為巷道的穩(wěn)定性分析提供理論依據(jù)和為有效支護(hù)的確定提供一定的參考。
[Abstract]:In the course of tunnel excavation, the stress in surrounding rock is redistributed and deformed and destroyed, in order to ensure the stability and normal use of roadway, It is necessary to study its stability and effective support. In this paper, considering the nonlinear mechanical response of roadway surrounding rock and the damage and failure characteristics of rock mass, starting from the damage mechanism of micro-crack generation and propagation in rock mass, The nonlinear damage constitutive model of rock mass ("straight-curvilinear" constitutive model) is established. The calculation formulas of radius and displacement of surrounding rock in different regions of circular roadway under isobaric load are obtained, and the balance equation of surrounding rock is obtained. Based on the principle of spatial effect of excavation surface of roadway, a mechanical model of the coupling effect of surrounding rock and support is established by adopting the method of step by step combined support to control the deformation of surrounding rock. The real time analytical solution of the interaction between surrounding rock and support and the equilibrium force of the interaction are obtained. Based on this, the distribution of initial damage D0, softening degree coefficient 尾 and damage proportional coefficient k to plastic damage zone and flow damage zone are analyzed. The influence of stress distribution and displacement on the supporting effect is also analyzed. In this paper, the roadway group in the bottom pit of Liuzhuang coal mine is taken as the engineering background. Using 3DEC numerical simulation software to analyze the control effect of surrounding rock deformation under the conditions of different timbering time (0.2m-1 m and 2ms from the simulated support structure to the excavated surface) and different supporting strength (simulating three support schemes). Then the displacement of surrounding rock surface and deep rock mass of roadway is monitored on site. The monitoring results verify the correctness of the research results, which can provide a theoretical basis for the stability analysis of roadways and a certain reference for the determination of effective support.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD322;TD353

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