本文選題：煤系砂巖　切入點：滲流-蠕變　出處：《中國礦業(yè)大學(xué)》2017年博士論文　論文類型：學(xué)位論文

【摘要】：隨著煤礦進入深部開采階段,復(fù)雜地質(zhì)環(huán)境條件下煤巖體流變特性顯著,巷道圍巖穩(wěn)定控制更加困難,煤礦安全生產(chǎn)所面臨的挑戰(zhàn)更加嚴峻。特別地,對于一些處于富水區(qū)域的煤礦,地下水滲流作用加快了巷道圍巖的變形,圍巖內(nèi)部裂隙發(fā)育極易導(dǎo)致地下水涌入巷道,誘發(fā)突水等礦井災(zāi)害事故。煤巖介質(zhì)滲流-蠕變損傷破裂特征及其蠕變模型研究是實現(xiàn)巷道圍巖穩(wěn)定性控制的理論基礎(chǔ)。本文設(shè)計并組建適合完整巖石試樣滲流-蠕變耦合試驗系統(tǒng),以典型煤層頂板砂巖為研究對象,結(jié)合掃描電鏡SEM試驗,從宏觀與細觀兩個層面系統(tǒng)研究滲流作用下砂巖蠕變損傷破裂機理,基于分數(shù)階微積分理論,建立相應(yīng)的滲流-蠕變模型。主要取得以下研究成果:(1)對煤系砂巖開展四種情況下的滲流-蠕變耦合試驗,獲得砂巖蠕變特性曲線,研究滲透壓力與圍壓對砂巖蠕變特性及滲透特性的影響,明確砂巖最大蠕變量、不同階段蠕變變形速率、滲透速率、滲透率等參數(shù)的變化規(guī)律。(2)系統(tǒng)研究砂巖滲流-蠕變破壞的宏觀特征,如宏觀破壞方式、破裂面粗糙度等;基于掃描電鏡SEM試驗,獲得不同條件下砂巖滲流-蠕變破壞斷口細觀特征形貌,分析砂巖損傷斷裂模式隨圍壓與滲透壓力的演化規(guī)律;建立砂巖局部細觀斷裂與宏觀破壞之間的聯(lián)系,揭示滲流作用下砂巖蠕變斷裂機制。(3)基于巖石蠕變理論、分數(shù)階微積分理論,以基本力學(xué)元件為基礎(chǔ),按照串并聯(lián)法則,建立煤系砂巖整數(shù)階與分數(shù)階非線性粘彈塑性三維蠕變模型,基于太沙基應(yīng)力原理,建立煤系砂巖整數(shù)階與分數(shù)階滲流-蠕變模型,利用最小二乘法確定模型參數(shù),對整數(shù)階與分數(shù)階模型的精度進行評價。(4)基于分布階微積分理論,應(yīng)用單元網(wǎng)絡(luò)思想,以分布階粘壺為基礎(chǔ),建立分布階三參量固體模型,通過具體算例分析巖石材料的流變特性;以單個含損傷的分數(shù)階粘壺為基礎(chǔ),提出含損傷分布階粘壺,以整數(shù)階西原模型為基礎(chǔ),建立含損傷的分布階西原模型,通過具體算例,分析煤系砂巖的損傷蠕變特性。研究結(jié)論可為深部富含水域煤礦巷道圍巖穩(wěn)定性控制及突水災(zāi)害等防治提供理論依據(jù)。
[Abstract]:With the coal mine entering the stage of deep mining, the rheological characteristics of coal and rock mass are obvious under the complex geological environment, the stability control of roadway surrounding rock is more difficult, and the challenge of coal mine safety production is more severe. For some coal mines in water-rich areas, the seepage of groundwater accelerates the deformation of surrounding rock of roadway, and the development of cracks in surrounding rock can easily lead to the influx of groundwater into roadway. The characteristics of percolation and creep damage and fracture characteristics of coal and rock media and their creep model are the theoretical basis for the stability control of roadway surrounding rock. This paper designs and sets up a seepage model suitable for intact rock samples. -creep coupled test system, Taking the typical coal seam roof sandstone as the research object and combining with the SEM test of scanning electron microscope, the creep damage and fracture mechanism of sandstone under percolation is systematically studied from macroscopic and meso levels, based on fractional calculus theory. A corresponding seepage creep model was established. The following research results were obtained: 1) the seepage creep coupling test was carried out on coal-measure sandstone under four conditions, and the creep characteristic curve of sandstone was obtained. The influence of permeability pressure and confining pressure on the creep and permeability characteristics of sandstone is studied. The maximum creep amount of sandstone, the creep deformation rate in different stages and the permeability rate are determined. This paper systematically studies the macroscopic characteristics of seepage and creep failure of sandstone, such as the macroscopic failure mode, the roughness of fracture surface and so on, based on the SEM test of scanning electron microscope, The microscopic morphology of sandstone seepage creep failure fracture is obtained under different conditions, the evolution law of sandstone damage fracture model with confining pressure and permeability pressure is analyzed, and the relationship between local meso-fracture and macroscopic failure of sandstone is established. It is revealed that the creep fracture mechanism of sandstone under seepage action is based on rock creep theory, fractional calculus theory, based on basic mechanical elements, according to series-parallel rule, The integral order and fractional order nonlinear viscoelastic-plastic creep model of coal-measure sandstone is established. Based on the terashage stress principle, the integral order and fractional order percolation creep model of coal-measure sandstone is established, and the model parameters are determined by the least square method. The accuracy of integral order and fractional order model is evaluated. (4) based on the theory of distributed order calculus, the distributed order three parameter solid model is established based on the idea of unit network and based on the distributed order sticky pot. The rheological characteristics of rock materials are analyzed by a concrete example. Based on a single fractional-order viscometer with damage, the paper presents a new model of distribution-order viscometer with damage, which is based on integer order western-primitive model. The damage and creep characteristics of coal-measure sandstone are analyzed by an example, and the results can provide theoretical basis for the control of surrounding rock stability and water inrush disaster in deep and rich water mine roadway.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TD313

【相似文獻】

相關(guān)期刊論文 前7條

1 劉杰;董鵬真;何小亞;;分數(shù)階Lǚ系統(tǒng)的動力學(xué)分析[J];武漢科技學(xué)院學(xué)報;2008年08期

2 賈紅艷;;一個分數(shù)階混沌系統(tǒng)的分析及電路設(shè)計[J];天津科技大學(xué)學(xué)報;2013年01期

3 隋麗麗;劉瑞芹;;分數(shù)階超混沌L，

本文編號：1579371