發(fā)布時(shí)間：2018-07-16 13:40

【摘要】：為了研究層流狀態(tài)下粗糙單裂隙面的滲流特性,基于格子Boltzmann方法,建立了壓力作用下單裂隙面滲流的數(shù)值模型。采用D2Q9模型模擬離散速度分布方向,在宏觀尺度上,上、下邊界設(shè)置為不透水邊界(u_x=u_y=0),左、右邊界為壓力邊界(左側(cè)壓力p_(in)大于右側(cè)壓力p_(out))在微觀尺度上,左、右邊界及光滑裂隙表面采用非平衡態(tài)外推格式,粗糙裂隙表面采用標(biāo)準(zhǔn)反彈格式。編制了相應(yīng)的計(jì)算程序,驗(yàn)證了光滑平板裂隙流的立方定律。采用分段隨機(jī)裂隙長及裂隙寬的方法生成了粗糙裂隙面,并基于格子Boltzmann方法研究了不同粗糙裂隙面方案的滲流特性。研究結(jié)果表明:對(duì)于粗糙裂隙面,滲流特征極大程度取決于裂隙表面形貌,隨著相對(duì)粗糙度的增加,裂隙滲流規(guī)律明顯偏離立方定律。為此,考慮裂隙面相對(duì)粗糙度的影響,根據(jù)不同裂隙粗糙面方案的數(shù)值計(jì)算結(jié)果,提出了層流狀態(tài)下粗糙裂隙面滲流的立方定律修正公式,為系統(tǒng)研究復(fù)雜粗糙裂隙的水力特性奠定了一定的基礎(chǔ)。
[Abstract]:In order to study the percolation characteristics of rough single fracture surface in laminar flow, a numerical model for the seepage of fracture surface under pressure action is established based on the lattice Boltzmann method. D2Q9 model is used to simulate the direction of discrete velocity distribution. On macroscopic scale, the lower boundary is set as impermeable boundary (u_x=u_y=0), the left and right boundary is pressure boundary (left pressure p _ (in) is larger than right side pressure p _ (out) on microscopic scale, left, left). The non-equilibrium extrapolation scheme is used on the right boundary and smooth fracture surface, and the standard rebound scheme is used on the rough fracture surface. The cubic law of smooth slab fissure flow is verified by the corresponding calculation program. Based on the lattice Boltzmann method, the percolation characteristics of different rough fracture surface schemes are studied by using the method of segment random fracture length and crack width. The results show that the percolation characteristics of rough fracture surface depend on the fracture surface morphology to a great extent. With the increase of relative roughness, the law of fracture seepage deviates from the cubic law obviously. Therefore, considering the influence of the relative roughness of the fracture surface, according to the numerical results of different fracture rough surface schemes, the cubic law correction formula for the seepage of the rough fracture surface under laminar flow is proposed. It lays a foundation for the systematic study of hydraulic characteristics of complex rough fractures.
【作者單位】： 昆明理工大學(xué)建筑工程學(xué)院;中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助(No.51408284.No.51508253,No.U1502231) 云南省應(yīng)用基礎(chǔ)研究計(jì)劃項(xiàng)目(No.2016FB077)~~
【分類號(hào)】：TU45

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相關(guān)期刊論文 前10條

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本文編號(hào)：2126566