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  本文選題：茅口灰?guī)r + 流固耦合��； 參考：《湖南科技大學》2015年碩士論文

【摘要】：滲流場中巖體的力學特性和應(yīng)力場下巖體的滲透規(guī)律是巖石力學學科領(lǐng)域的前沿方向。在滲流場中的巖體,一方面由于外部荷載的作用,巖體內(nèi)部應(yīng)力進行重分布,從而影響巖體的結(jié)構(gòu),改變巖體中水的作用強度、范圍及形式;另一方面,不同應(yīng)力狀態(tài)下巖石內(nèi)部結(jié)構(gòu)不同,導(dǎo)致巖石滲流路徑不同。巖體滲流一應(yīng)力耦合理論在采礦工程、水利水電領(lǐng)域、地鐵建設(shè)領(lǐng)域等有重要的指導(dǎo)意義和廣泛的應(yīng)用前景。本文以國家自然科學基金項目(51174088):二次卸荷條件下巖體流變損傷破壞機理研究、國家自然科學基金項目(51274097):茅口灰?guī)r隱伏承壓溶洞圍巖時效破斷-滯后突水機理研究為依托,在茅口灰?guī)r流固耦合試驗和強度試驗基礎(chǔ)上,研究了不同圍壓滲透壓作用下茅口灰?guī)r的強度特性、變形特性、滲流特性及破壞特征,揭示了滲流—應(yīng)力作用下茅口灰?guī)r的各種特性的變化機制。主要研究內(nèi)容有:(1)基于流固耦合試驗和強度試驗,求解了巖石的各強度值及其參數(shù),分析研究了圍壓、滲透壓對茅口灰?guī)r的峰值強度、起裂強度和損傷強度影響;分析了滲透壓對茅口灰?guī)r抗剪強度及其參數(shù)的影響、對巖石變形特征及各變形參數(shù)的影響、對破壞特征的影響;結(jié)合斷裂力學理論探討分析滲透壓作用下,茅口灰?guī)r的起裂強度變化機制,得出滲透水壓與裂隙初裂強度成負相關(guān)關(guān)系;(2)研究茅口灰?guī)r漸進破壞階段滲透壓差演化規(guī)律,將壓縮破壞過程中的滲透壓差?P變化規(guī)律劃分為四個階段,并分析了不同圍壓對?P的影響,基于采集的滲透壓差數(shù)據(jù),計算出巖石的峰前滲透系數(shù),并研究了不同圍壓作用下的滲透特性;基于Kozeny-carman方程建立漸進破壞過程滲透性與體積應(yīng)變的關(guān)系,并將試驗所得的數(shù)據(jù)與理論模型進行驗證;(3)基于試驗數(shù)據(jù),通過引用孔壓弱化系數(shù),提出兩種考慮滲透壓作用的巖石強度準則,并對兩新準則進行對比研究。將新準則和其他常用強度準則進行比較分析,驗證新準則的準確性與適用性。
[Abstract]:The mechanical properties of rock mass in the seepage field and the law of permeability under stress field are the frontiers in the field of rock mechanics. On the one hand, the rock mass in the seepage field, on the one hand, redistributes the internal stress in the rock mass due to the effect of the external load, thus affecting the structure of the rock mass and changing the strength, scope and form of the water in the rock; on the other hand, The rock internal structure is different under different stress state, which leads to different seepage path of rock. The theory of stress coupling of rock mass seepage has important guiding significance and wide application prospect in mining engineering, water conservancy and hydropower field, subway construction field and so on. In this paper, the State Natural Science Foundation Project (51174088): rock mass rheology under the condition of two unloading Research on damage and destruction mechanism, National Natural Science Fund Project (51274097): Study on the mechanism of aging fracture and lagging water inrush in the hidden confined karst cave of Makou limestone, based on the fluid solid coupling test and strength test of Makou limestone, the strength, deformation and seepage characteristics of mamakou limestone under different confining pressure and osmotic pressure are studied. The main research contents are as follows: (1) based on the fluid solid coupling test and strength test, the strength and parameters of rock are solved and the peak strength of the peri pressure and osmotic pressure on the peak strength and the damage strength of the maotun limestone are analyzed and studied. The influence of osmotic pressure on the shear strength and its parameters of Maotu limestone, the influence on the rock deformation characteristics and the deformation parameters, the influence of the damage characteristics, and the mechanism of the change of the breaking strength of the Makou limestone under the action of osmotic pressure are discussed in combination with the fracture mechanics theory, and the negative correlation between the seepage pressure and the crack initial crack strength is obtained. (2) research on the relationship between the seepage pressure and the initial crack strength of the fissure. The evolution law of osmotic pressure difference in the progressive failure stage of Makou limestone is studied, and the variation law of osmotic pressure difference? P in the process of compression failure is divided into four stages, and the influence of different confining pressure on P is analyzed. Based on the data collected by the osmotic pressure difference, the permeability coefficient of the rock is calculated and the permeability characteristics under different confining pressure are studied; based on K The ozeny-carman equation establishes the relationship between the permeability and the volume strain of the progressive failure process, and verifies the data obtained by the experiment and the theoretical model. (3) based on the test data, two kinds of rock strength criteria for osmotic pressure are proposed by reference to the pore pressure weakening coefficient, and the new criterion is compared with the new criterion and the others. Common strength criteria are compared and analyzed to verify the accuracy and applicability of the new criteria.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU452

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本文編號：1970994