【摘要】：為研究加筋土界面作用的力學(xué)響應(yīng),對(duì)離散元程序(PFC3D)進(jìn)行二次開(kāi)發(fā),建立了土工格柵拉拔試驗(yàn)仿真模型。與室內(nèi)模型試驗(yàn)結(jié)果進(jìn)行對(duì)比,探討了拉拔界面細(xì)觀參數(shù)的演變及荷載傳遞機(jī)理,揭示了細(xì)觀參數(shù)的演化規(guī)律及其與宏觀力學(xué)性質(zhì)之間的關(guān)系。研究結(jié)果表明:筋土界面區(qū)域成為主要的位移集中區(qū),上界面影響厚度略大于下界面影響厚度;在筋土界面區(qū)域形成了高度的X向應(yīng)力集中,沿格柵長(zhǎng)度方向出現(xiàn)若干個(gè)Z向應(yīng)力集中區(qū),表明格柵橫肋擠壓土體,其所提供的被動(dòng)承載力較為顯著;在筋土界面區(qū)域,局部孔隙率隨拉拔位移增大而增大,接觸數(shù)減少,滑動(dòng)比隨拉拔位移的增加發(fā)生了激烈的跌宕起伏,界面局部位置發(fā)生剪脹,宏觀上對(duì)應(yīng)拉拔阻力增大,而后孔隙率慢慢減小,拉拔阻力回落。
[Abstract]:In order to study the mechanical response of the interface of reinforced soil, the discrete element program (PFC3D) was redeveloped, and the simulation model of geogrid drawing test was established. Compared with the results of indoor model tests, the evolution of meso-parameters and the mechanism of load transfer at drawing interface are discussed, and the relationship between the evolution of meso-parameters and the macroscopic mechanical properties is revealed. The results show that the interfacial area of reinforced soil is the main concentration area of displacement, the influence thickness of the upper interface is slightly larger than that of the lower interface, and a high degree of X-ray stress concentration is formed in the area of the interface between the reinforcement and soil. Along the direction of grid length, there are several Z stress concentration zones, which indicate that the passive bearing capacity of the cross rib of the grid squeezing soil is significant, and the local porosity increases with the increase of drawing displacement and decreases with the increase of drawing displacement in the interface area of reinforced soil. With the increase of drawing displacement, the sliding ratio fluctuates intensely, the local position of the interface increases, the relative drawing resistance increases, then the porosity decreases slowly, and the drawing resistance decreases.
【作者單位】： 廣西科技大學(xué)土木建筑工程學(xué)院;同濟(jì)大學(xué)地下建筑與工程系;廣西大學(xué)工程防災(zāi)與結(jié)構(gòu)安全教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51009030) 廣西自然科學(xué)基金資助項(xiàng)目(2011GXNSFB018003) 廣西防災(zāi)減災(zāi)與工程安全實(shí)驗(yàn)室開(kāi)放課題資助項(xiàng)目(2012ZDK07) 廣西科技大學(xué)博士基金資助項(xiàng)目(院科博1011)
【分類(lèi)號(hào)】：TU47;TU53

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