本文選題：土石混合體 + 滲流侵蝕　； 參考：《巖土力學(xué)》2017年05期

【摘要】：土石混合體是由塊石、礫石與砂土、黏土等固體顆粒組成,以塊石鑲嵌在細(xì)粒土體中為結(jié)構(gòu)特征的松散介質(zhì)。由于其顆粒松散特性,細(xì)顆粒在滲流作用下易于流失而形成滲流侵蝕。采用室內(nèi)試驗(yàn)與數(shù)值模擬相結(jié)合的方法,擴(kuò)展?jié)B流侵蝕模型在土石混合體滲透侵蝕研究中的應(yīng)用。選取云南某滑坡土石混合體為研究對(duì)象,采用自制的滲透侵蝕裝置,模擬土體基質(zhì)滲透侵蝕過(guò)程,獲取土體基質(zhì)侵蝕參數(shù)試驗(yàn)值。根據(jù)塊石在土體基質(zhì)中分布特征,建立不同塊石含量特征的土石混合體計(jì)算模型�；趨�(shù)試驗(yàn)值及滲流侵蝕方程、耦合滲流控制方程及孔隙率控制方程,模擬土石混合體滲流侵蝕過(guò)程,分析塊石含量對(duì)土石混合體滲透侵蝕特性的影響。模擬結(jié)果表明:在同等水力梯度及時(shí)間條件下,塊石含量與土石混合體宏觀平均流速初值、侵蝕顆粒密度值呈反比,與液化顆粒密度峰值呈正比;塊石含量與滲流侵蝕方程中試驗(yàn)參數(shù)存在線性相關(guān)性。將塊石含量作為土石混合體結(jié)構(gòu)特征引入滲流侵蝕方程中,以構(gòu)建適用于土石混合體的滲流侵蝕模型。
[Abstract]:The soil-rock mixture is a loose medium which is composed of solid particles such as block gravel sand clay and so on. Due to its loose properties, fine particles are easy to be lost under seepage and form seepage erosion. The application of extended seepage erosion model in soil and rock mixture is studied by using the method of laboratory test and numerical simulation. A mixture of landslide, soil and rock in Yunnan Province was selected as the research object. The soil matrix erosion parameters were obtained by using a self-made infiltration erosion device to simulate the process of soil matrix infiltration erosion. According to the characteristics of rock mass distribution in soil matrix, a calculation model of mixed rock with different mass content was established. Based on the experimental data, seepage erosion equation, coupled seepage control equation and porosity control equation, the seepage erosion process of soil-rock mixture is simulated, and the influence of rock mass content on seepage erosion characteristics of soil-rock mixture is analyzed. The simulation results show that under the same hydraulic gradient and time, the mass content is inversely proportional to the initial value of macroscopic average velocity of the soil-rock mixture, and the density of the erosion particles is inversely proportional to the peak value of the liquefaction particle density. There is a linear correlation between the rock mass content and the experimental parameters in the seepage erosion equation. The mass stone content is introduced into the seepage erosion equation as the structural characteristics of the soil-rock mixture, and a seepage erosion model suitable for the soil-rock mixture is constructed.
【作者單位】： 上海交通大學(xué)船舶海洋與建筑工程學(xué)院;九江學(xué)院土木與城建學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(No.51479112,No.50979055) supported by the National Natural Science Foundation of China(51479112,50979055)
【分類(lèi)號(hào)】：TU43

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