本文關(guān)鍵詞：高壓水作用下井壁混凝土耦合損傷演化機理及強度特征研究　出處：《安徽理工大學(xué)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 含水不穩(wěn)定地層 煤礦井筒 井壁混凝土 高壓水荷載 損傷演化機理 強度特征 混凝土力學(xué)試驗 模型試驗 出水機理 數(shù)值計算

【摘要】：煤炭資源開采目前已向深部延伸,新建煤礦井筒穿過含水不穩(wěn)定地層越來越厚,井壁因此所需承受的地下水壓力越來越大;而混凝土作為主要筑壁材料,在高地下水壓作用下其損傷演化進程與強度發(fā)展問題愈加突出。并且與地面空氣環(huán)境中的混凝土不同,井壁混凝土長期處于高壓水荷載直接作用下,其損傷演化進程和強度特征必將發(fā)生變化,這是一個值得研究的問題。因此,論文將充分考慮地下水滲流作用對井壁混凝土應(yīng)力變形的耦合影響,采用混凝土力學(xué)試驗、相似模型試驗、理論分析、數(shù)值計算等研究手段,探究了高壓水荷載直接作用下井壁混凝土損傷演化機理以及強度變形特征。針對煤礦立井井筒支護難題,配制出密實度高、抗?jié)B性好的高強高抗?jié)B混凝土作為筑壁材料,并對其在地面空氣環(huán)境中的主要物理力學(xué)性能進行試驗研究,可為后續(xù)高壓水荷載直接作用下井壁混凝土物理力學(xué)參數(shù)變化提供對比,以及解析解與數(shù)值計算參數(shù)的選取提供參考。綜合考慮水壓力大小、水壓作用時間、混凝土強度等級三種不同影響因素耦合作用效應(yīng),借助SPSS數(shù)理統(tǒng)計軟件設(shè)計出混合正交試驗表,開展高壓水荷載直接作用下井壁混凝土耦合損傷試驗。結(jié)果表明對混凝土峰值強度的影響強弱程度依次為水壓力大小、混凝土強度等級、水壓作用時間。結(jié)合聲波測試結(jié)果、welbull統(tǒng)計分布理論、lemaitre等效應(yīng)變假設(shè)以及損傷力學(xué)理論,建立了高壓水荷載直接作用下井壁混凝土耦合損傷演化方程,并基于混凝土強度理論推導(dǎo)出相應(yīng)條件下本構(gòu)模型。采用巖石三軸試驗機開展了高壓水荷載直接作用下井壁混凝土水力耦合滲透性試驗。結(jié)果表明孔隙水在混凝土內(nèi)部滲流時對其造成的損傷影響較為明顯,加速試件的變形破壞;同等條件下孔隙水壓越大,井壁混凝土峰值強度及割線彈性模量降低越明顯;結(jié)合理論分析建立了應(yīng)力滲流耦合狀態(tài)下井壁混凝土滲透率演化概念模型。根據(jù)養(yǎng)護條件不同將井壁混凝土分為常規(guī)、飽和、密封三種狀態(tài),開展了高壓水荷載直接作用下井壁混凝土強度及變形特征試驗研究。發(fā)現(xiàn)三種不同狀態(tài)井壁混凝土都呈現(xiàn)出鮮明的水圍壓增強效應(yīng),密封狀態(tài)井壁混凝土水圍壓增強效應(yīng)明顯高于常規(guī)和飽和兩種狀態(tài);高壓水荷載直接作用下井壁混凝土強度呈非線性增長,采用Bresler三參數(shù)強度破壞準(zhǔn)則擬合效果最佳;不同強度等級不同狀態(tài)井壁混凝土廣義峰值軸向應(yīng)變與水圍壓呈線性增長關(guān)系�；谙嗨颇Ｐ屠碚撛O(shè)計出模型井壁,參照正交試驗設(shè)計原理將混凝土強度等級、厚徑比、配筋率作為影響因素。采用準(zhǔn)平面應(yīng)變加載方式,進行了高壓水荷載直接作用下井壁結(jié)構(gòu)模型試驗,根據(jù)試驗結(jié)果及正八面體應(yīng)力空間強度理論建立了相應(yīng)條件下井壁混凝土強度準(zhǔn)則和極限承載力經(jīng)驗公式。基于上述強度準(zhǔn)則同時引入高強混凝土脆性損傷因子,在考慮地下水滲流變形耦合影響的基礎(chǔ)上進行立井井壁出水機理分析,推導(dǎo)得到了相應(yīng)條件下立井井壁極限水壓力彈塑性解析解,并對其主要影響因素進行了分析比較。基于ABAQUS/CAE應(yīng)力滲流耦合分析模塊,開展了考慮地下水滲流動態(tài)耦合影響下井壁與圍巖共同作用時應(yīng)力損傷數(shù)值計算,利用USDFLD.for子程序?qū)崿F(xiàn)了滲透系數(shù)與孔隙率的動態(tài)耦合分析,結(jié)果表明井壁在已發(fā)生損傷區(qū)域最大主應(yīng)力與損傷明顯區(qū)別于傳統(tǒng)耦合,為動態(tài)耦合完全分析提供了有效途徑。
[Abstract]:The exploitation of coal resources has been extended to the deep water, the new mine shaft through Unstable Strata more thick, so the wall needed for groundwater under increasing pressure; and concrete as the main building wall materials, water pressure in the high damage evolution process and the problem is increasingly prominent. The development of strength and different with the ground the air in the environment of concrete, concrete in direct high-pressure water load, the damage evolution process and strength characteristics will be changed, this is a problem worthy of study. Therefore, this paper will fully consider the coupling effect of groundwater seepage on stress and deformation of the concrete wall, the concrete mechanics test, model test theoretical analysis, numerical calculation and other research methods, to explore the direct effect of the high-pressure water load of wall concrete damage evolution mechanism and strength deformation characteristic Sign. In order to solve the problem of coal mine shaft supporting, with high density, high strength and good impermeability and high impermeability concrete as lining material, and the experimental study on the ground in the air environment in the main physical and mechanical performance, can provide comparison of the change of physical mechanical parameters of concrete directly following the high-pressure water load the well wall, and the analytical solution with the numerical parameters of the selected reference. Considering the water pressure, water pressure time, the concrete strength grade of three different factors affecting the coupling effect, using SPSS statistical software to design a hybrid orthogonal test table, carry out the coupling damage test of concrete under direct high-pressure water load. The results show that the influence of concrete strength of the degree of order of peak water pressure, the strength grade of concrete, water pressure time. Combined with the test results of acoustic wave, Welbull The statistical distribution theory, Lemaitre strain hypothesis and the theory of damage mechanics, the damage evolution equation of concrete wall is established directly coupled high-pressure water load, and based on the strength of concrete is deduced under the condition of the corresponding constitutive model. The three axis test carried out rock permeability test of concrete hydraulic coupling under direct high-pressure water load the effect of pore water. The results show that the damage caused to the concrete internal flow is obvious, accelerated deformation destruction; under the same conditions the pore pressure increases, the peak strength and concrete secant elastic modulus decreased more obviously; the concrete permeability coupling seepage force under the evolution of conceptual model with theoretical analysis. According to the different curing conditions will be divided into conventional concrete, saturated, sealing the three state to carry out high-pressure water load directly Experimental study on deformation and strength characteristics of concrete under the action of. Three kinds of concrete shows a sharp water pressure enhancement effect, the sealing state of wall concrete water confining pressure enhancement effect was significantly higher than that of conventional and two saturated state; the high-pressure water load directly under the action of lining concrete strength is nonlinear growth, using the three parameter Bresler the best fitting effect of strength failure criterion; different strength grade of different concrete generalized peak axial strain and confining pressure of water increases linearly. The similar model is designed based on the theory model of wellbore, according to orthogonal design principle of concrete strength, diameter thickness ratio, reinforcement ratio as the influencing factors. The plane strain loading. The wall structure model under direct high-pressure water load test, according to test results and eight sided stress intensity space Theory of experiential formula of the bearing capacity of wall concrete strength criterion and the corresponding limit conditions. The strength criterion based on introducing damage factor of brittleness of concrete, considering the seepage deformation coupling effect analysis on shaft lining water mechanism is deduced under the corresponding condition of shaft lining water pressure limit elastoplastic analysis, and the main influencing factors are analyzed and compared. The ABAQUS/CAE seepage stress coupling analysis module based on the influence of groundwater seepage coupling dynamic interaction under shaft and surrounding rock stress damage numerical calculation, the dynamic coupling coefficient of permeability and porosity analysis using the USDFLD.for subroutine, results show that wall damage in the regional maximum principal stress and the damage is obviously different from the traditional coupling has occurred, and provides an effective way for the dynamic coupling analysis completely.

【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TD352

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