發(fā)布時(shí)間：2018-03-17 19:35

  本文選題：裂隙巖體　切入點(diǎn)：滲透系數(shù)　出處：《山東科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：巖體是一種包含不同尺度節(jié)理裂隙的復(fù)雜天然地質(zhì)體,由完整巖石和節(jié)理裂隙組成。在地鐵隧道、海底隧道、煤礦巷道等地下工程中的巖體賦存于一定地質(zhì)環(huán)境中,巖體的賦存環(huán)境主要包括地應(yīng)力場及地下滲流場的作用,地下水在巖體裂隙里的流動(dòng)過程中地應(yīng)力場與滲流場之間會產(chǎn)生相互影響,這種相互作用是影響巖體滲透特性和工程穩(wěn)定性的重要因素,因此研究巖體滲流過程中應(yīng)力場與滲流場的耦合作用具有重要意義。裂隙巖體的流-固耦合研究多基于單裂隙的流-固耦合,從單裂隙研究入手研究多裂隙巖體流-固耦合是十分必要的�，F(xiàn)有研究工作雖然在裂隙巖體滲流方面取得系列創(chuàng)新性成果,但對于不同性質(zhì)地層接觸區(qū)處裂隙面滲流特性的認(rèn)識尚不全面,現(xiàn)有裂隙滲透理論還不能為實(shí)際工程中不同地層接觸區(qū)處裂隙面滲透系數(shù)的計(jì)算提供可靠的理論依據(jù)和準(zhǔn)確的計(jì)算方法。針對上述問題本文首先通過對人工制作的復(fù)合單裂隙細(xì)砂巖、復(fù)合單裂隙粗砂巖和復(fù)合單裂隙粗細(xì)砂巖巖體進(jìn)行滲流試驗(yàn),揭示裂隙面兩側(cè)巖性、裂隙水壓及裂隙面法向應(yīng)力對裂隙面滲透性的影響規(guī)律;然后基于三維應(yīng)力下的裂隙-巖塊位移模型,推導(dǎo)考慮裂隙面兩側(cè)巖性、裂隙面剛度系數(shù)、裂隙水壓和裂隙面法向應(yīng)力的裂隙巖體滲透系數(shù)理論計(jì)算公式;最后通過試驗(yàn)對新推出的裂隙巖體滲透系數(shù)計(jì)算公式的正確性及適用性進(jìn)行了驗(yàn)證。通過研究本文得出以下主要結(jié)論:(1)在試驗(yàn)過程中,單裂隙巖體滲透系數(shù)隨裂隙水壓的增加呈線性增加,隨著凈圍壓的增加呈指數(shù)函數(shù)減小。(2)圍壓會引起裂隙的閉合,導(dǎo)致滲透系數(shù)減小;裂隙水壓會使裂隙擴(kuò)張,使裂隙滲透系數(shù)增加,并且在單裂隙擴(kuò)展之初裂隙水壓是影響裂隙初始寬度和初始滲透系數(shù)不可忽略的重要因素,因此在進(jìn)行裂隙滲透系數(shù)理論計(jì)算時(shí)不宜僅用圍壓減去裂隙水壓得到的凈圍壓來進(jìn)行計(jì)算,而應(yīng)同時(shí)考慮裂隙水壓對裂隙滲透系數(shù)的影響。(3)裂隙巖體裂隙面兩側(cè)巖塊的巖性對裂隙滲透系數(shù)有顯著影響,在相同的裂隙水壓和圍壓共同作用下,單裂隙粗砂、單裂隙粗細(xì)砂巖復(fù)合體、單裂隙細(xì)砂的裂隙滲透系數(shù)各不相同,其中單裂隙粗砂巖滲透系數(shù)最大,單裂隙粗細(xì)砂巖復(fù)合巖體次之,單裂隙細(xì)砂最小。(4)本文基于裂隙巖體-位移模型,推導(dǎo)了考慮裂隙水壓、圍壓與裂隙兩側(cè)為不同性質(zhì)巖塊的單裂隙巖體滲透系數(shù)計(jì)算模型及理論計(jì)算公式,并在試驗(yàn)中驗(yàn)證了其適用性和正確性,新推出的計(jì)算公式可為實(shí)際工程中不同地層接觸區(qū)處裂隙面滲透系數(shù)的計(jì)算提供可靠的理論依據(jù)和相對準(zhǔn)確的計(jì)算方法。
[Abstract]:Rock mass is a kind of complex natural geological body which contains joints and fractures of different scales. Rock mass in underground engineering such as subway tunnel, subsea tunnel, coal mine tunnel and so on occurs in a certain geological environment. The occurrence environment of rock mass mainly includes the action of ground stress field and underground seepage field, and the interaction between ground stress field and seepage field will occur during the flow process of groundwater in rock mass fissure. This interaction is an important factor affecting the permeability characteristics and engineering stability of rock mass. Therefore, it is of great significance to study the coupling of stress field and seepage field in the seepage process of rock mass. The fluid-solid coupling of fractured rock mass is mostly based on the fluid-solid coupling of single fracture. It is necessary to study the fluid-solid coupling of multi-fissure rock mass from the study of single fracture. Although the existing research work has made a series of innovative achievements in seepage of fractured rock mass, However, the understanding of seepage characteristics of fracture surface in the contact area of different strata is not comprehensive. The existing fracture permeability theory can not provide reliable theoretical basis and accurate calculation method for calculating the permeability coefficient of fracture surface in different strata contact area in actual engineering. Composite single fracture fine sandstone, In order to reveal the influence of lithology, water pressure and normal stress on the permeability of fracture surface, the seepage tests of composite single fissure coarse sandstone and composite single fissure coarse sandstone rock mass are carried out to reveal the influence of lithology, water pressure and normal stress on the permeability of fracture surface. Then, based on the three dimensional displacement model of fissure and rock mass, the theoretical formula of permeability coefficient of fractured rock mass considering the lithology, stiffness coefficient, water pressure and normal stress of fractured rock mass is derived. Finally, the correctness and applicability of the new formula for calculating permeability coefficient of fractured rock mass are verified by experiments. The permeability coefficient of single fractured rock mass increases linearly with the increase of fissure water pressure, and decreases with the increase of net confining pressure. The fracture permeability coefficient is increased, and the water pressure of the crack is an important factor which can not be ignored in the initial crack width and the initial permeability coefficient at the beginning of the expansion of a single fracture. Therefore, in the theoretical calculation of fracture permeability coefficient, the net confining pressure obtained by subtracting the water pressure of the fracture should not be used to calculate only the confining pressure. At the same time, the influence of water pressure on the permeability coefficient of fractures should be taken into account. (3) the lithology of rock blocks on both sides of fissure face of fractured rock mass has a significant effect on the permeability coefficient of fractures. Under the same water pressure and confining pressure, the coarse sand with single fissure should be taken into account. The permeability coefficient of single fissure coarse sandstone complex is different from that of single fissure fine sand, the permeability coefficient of single fissure coarse sandstone is the largest, and that of single fissure coarse sandstone composite rock is the second. In this paper, based on the fissured rock-displacement model, the calculation model and theoretical formula of permeability coefficient of single fractured rock mass are derived, which consider the water pressure of fissures, the confining pressure and the rock masses of different properties on both sides of the fissure. The new formula can provide reliable theoretical basis and relatively accurate calculation method for the calculation of permeability coefficient of fracture surface in different strata contact area in practical engineering.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU45

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