發(fā)布時(shí)間：2018-03-19 04:00

  本文選題：煤巖　切入點(diǎn)：SHPB　出處：《安徽理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以潘謝煤田13-1煤層原煤為研究對(duì)象,結(jié)合實(shí)驗(yàn)室實(shí)驗(yàn)、理論分析和數(shù)值模擬,對(duì)氣煤煤巖的動(dòng)態(tài)力學(xué)性能及本構(gòu)關(guān)系進(jìn)行了研究。 利用分離式霍普金森壓桿實(shí)驗(yàn)系統(tǒng)對(duì)潘謝煤田張集煤礦13-1煤層原煤進(jìn)行了不同應(yīng)變率下的單軸沖擊壓縮實(shí)驗(yàn),成功采集了實(shí)驗(yàn)波形、煤巖破碎程度等數(shù)據(jù),利用三波法對(duì)原始數(shù)據(jù)進(jìn)行處理,得到了煤巖動(dòng)態(tài)應(yīng)力應(yīng)變曲線。實(shí)驗(yàn)結(jié)果表明：煤巖的動(dòng)態(tài)強(qiáng)度、動(dòng)態(tài)彈性模量及破碎程度均具有較強(qiáng)的應(yīng)變率敏感性,煤巖應(yīng)力應(yīng)變曲線表現(xiàn)出顯著的應(yīng)變硬化和應(yīng)變率硬化等動(dòng)態(tài)力學(xué)特性。 針對(duì)煤巖的動(dòng)態(tài)力學(xué)特性,根據(jù)粘彈性理論和損傷力學(xué)理論,簡化朱-王-唐方程并引入動(dòng)態(tài)損傷因子,建立了較好反映煤巖峰值應(yīng)力前動(dòng)態(tài)應(yīng)力應(yīng)變關(guān)系的本構(gòu)方程。由單軸壓縮實(shí)驗(yàn)和數(shù)據(jù)擬合得到全部本構(gòu)方程的未知參數(shù)。結(jié)果表明：所擬合動(dòng)態(tài)應(yīng)力應(yīng)變曲線與實(shí)測曲線吻合性較好,煤巖材料具有高應(yīng)變率響應(yīng)敏感性,且在高應(yīng)變率條件下氣煤比無煙煤表征更明顯的脆性特征。 基于煤巖動(dòng)態(tài)本構(gòu)方程,采用Fortran語言開發(fā)了VUMAT煤巖材料子程序,并利用商用有限元軟件ABAQUS中的用戶材料接口,將煤巖動(dòng)態(tài)本構(gòu)方程與ABAQUS接合起來,對(duì)不同應(yīng)變率下煤巖材料的動(dòng)態(tài)力學(xué)行為進(jìn)行了有限元模擬。通過分析和比較,本文所開發(fā)的煤巖材料子程序能較好的反映煤巖的動(dòng)態(tài)力學(xué)性能。
[Abstract]:In this paper, the dynamic mechanical properties and constitutive relations of coal and rock of gas coal are studied by taking the raw coal of coal seam 13-1 in PanXie coalfield as the research object, combining with the laboratory experiment, theoretical analysis and numerical simulation. The uniaxial impact compression experiment of coal seam 13-1 in Zhangji Coal Mine of PanXie coal field was carried out by using the split Hopkinson pressure bar experimental system. The experimental waveform and the degree of coal rock fragmentation were successfully collected. The dynamic stress-strain curves of coal and rock are obtained by using three-wave method. The experimental results show that the dynamic strength, dynamic elastic modulus and breaking degree of coal and rock have strong sensitivity to strain rate. The stress-strain curves of coal and rock show remarkable dynamic mechanical properties such as strain hardening and strain rate hardening. According to the dynamic mechanical properties of coal and rock, according to the viscoelastic theory and damage mechanics theory, the Zhu Wang-Tang equation is simplified and the dynamic damage factor is introduced. The constitutive equation of dynamic stress-strain relationship before peak stress of coal and rock is established. The unknown parameters of all constitutive equations are obtained by uniaxial compression experiment and data fitting. The results show that the dynamic stress-strain curve is fitted. The curve is in good agreement with the measured curve. Coal and rock materials are sensitive to high strain rate response, and gas coal shows more obvious brittleness than anthracite at high strain rate. Based on the dynamic constitutive equation of coal and rock, the subprogram of coal and rock material of VUMAT is developed by Fortran language, and the interface of user material in commercial finite element software ABAQUS is used to connect the dynamic constitutive equation of coal and rock with ABAQUS. The dynamic mechanical behavior of coal and rock materials under different strain rates is simulated by finite element method. Through analysis and comparison, the subroutine developed in this paper can better reflect the dynamic mechanical properties of coal and rock.
【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】：2015
【分類號(hào)】：TD313

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