發(fā)布時(shí)間：2018-06-25 19:26

  本文選題：裂隙巖體 + 離散裂隙網(wǎng)絡(luò)模型��； 參考：《南京理工大學(xué)》2015年碩士論文

【摘要】：裂隙巖體內(nèi)部因包含了眾多不連續(xù)的結(jié)構(gòu)面而形成一個(gè)離散裂隙網(wǎng)絡(luò)。這些巖體中的裂隙構(gòu)成了攜帶有放射性核素流體的潛在流通路徑。巖體中流體流動(dòng)的分析在巖土工程和水文工程中都非常重要,由于巖體中裂隙空間分布的復(fù)雜性,目前巖體滲透性的分析多是基于蒙特卡羅方法所生成的離散裂隙網(wǎng)絡(luò)模型。本文通過(guò)對(duì)高放廢料處置庫(kù)預(yù)選場(chǎng)址甘肅北山的實(shí)地勘察測(cè)量,獲得場(chǎng)區(qū)大量的裂隙信息,分別對(duì)實(shí)測(cè)的二維裂隙網(wǎng)絡(luò)模型進(jìn)行了滲透性分析和對(duì)基于蒙特卡羅方法生成的三維裂隙網(wǎng)絡(luò)模型進(jìn)行了滲流路徑搜索和滲透特性分析。借助近景攝影測(cè)量的方法,獲得露頭面上裂隙端點(diǎn)的三維坐標(biāo),并將其轉(zhuǎn)化為露頭面上的局部二維坐標(biāo),通過(guò)離散元方法建立該區(qū)域的二維離散裂隙網(wǎng)絡(luò)模型,選擇三個(gè)區(qū)域分別進(jìn)行滲透性分析,獲得三個(gè)區(qū)域的擬合滲透橢圓,并得到其在該露頭面內(nèi)的滲透張量和滲透主值及方向。根據(jù)大范圍內(nèi)各分塊的體密度和其他裂隙信息通過(guò)蒙特卡羅方法建立3D模型,得到與實(shí)際裂隙分布情況較為符合的三維離散裂隙網(wǎng)絡(luò)模型�；赩S2010平臺(tái),運(yùn)用DFS算法得到整體研究區(qū)域三個(gè)主要方向的較短滲流路徑,同時(shí)運(yùn)用圖論中Dijkstra算法得到三個(gè)主要方向的最短滲流路徑。為了得到研究區(qū)域的滲透特性,本文基于圖論管網(wǎng)方法編寫滲流計(jì)算程序,分別計(jì)算了三個(gè)主要方向較短滲流路徑及最短滲流路徑的滲透系數(shù)。同時(shí)通過(guò)對(duì)不同尺度不同方向子模型等效方向滲透系數(shù)的計(jì)算,得到了三維裂隙網(wǎng)絡(luò)模型滲流的REV大小和等效滲透系數(shù)張量,為評(píng)價(jià)研究區(qū)域內(nèi)裂隙的滲透性奠定了基礎(chǔ)。
[Abstract]:A discrete fissure network is formed in fractured rock mass due to the existence of many discontinuous structural planes. The cracks in these rock masses constitute a potential flow path carrying radionuclide fluids. The analysis of fluid flow in rock mass is very important in both geotechnical and hydrological engineering. Due to the complexity of space distribution of fractures in rock mass, the analysis of rock mass permeability is based on the discrete fracture network model generated by Monte Carlo method. In this paper, a large amount of fracture information is obtained from the field survey and survey of the pre-selected site of the high-level radioactive waste disposal depot in Beishan, Gansu Province. The permeability analysis of the measured two-dimensional fracture network model and the seepage path search and permeability characteristic analysis of the three-dimensional fracture network model based on Monte Carlo method are carried out respectively. With the help of the close-range photogrammetry method, the 3D coordinates of crack endpoints on the outcrop surface are obtained and transformed into the local two-dimensional coordinates on the outcrop surface, and the two-dimensional discrete fracture network model of the area is established by the discrete element method. The osmotic ellipse of the three regions is obtained by analyzing the permeability of the three regions, and the osmotic Zhang Liang and the main osmotic value and direction of the osmotic ellipse in the outcrop are obtained. According to the mass density and other fracture information of each block in a large area, the 3D model is established by Monte Carlo method, and the 3D discrete fracture network model, which is in good agreement with the actual fracture distribution, is obtained. Based on VS2010 platform, DFS algorithm is used to get the short seepage path in three main directions of the whole research area, and Dijkstra algorithm in graph theory is used to obtain the shortest seepage path in three main directions. In order to obtain the percolation characteristics of the studied area, the seepage calculation program is compiled based on the graph theory pipe network method, and the permeability coefficients of the shorter and shortest percolation paths are calculated respectively in three main directions. At the same time, by calculating the equivalent directional permeability coefficient of the submodels with different scales and different directions, the magnitude of REV and the equivalent permeability coefficient Zhang Liang of the 3-D fracture network model are obtained, which lays a foundation for evaluating the permeability of fractures in the study area.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU45

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