本文關(guān)鍵詞：膠結(jié)土石混合體力學(xué)特性的塊石形狀效應(yīng)細(xì)觀機(jī)理分析　出處：《固體力學(xué)學(xué)報(bào)》2015年06期 　論文類型：期刊論文

  更多相關(guān)文章： 膠結(jié)土石混合體 三維離散元 塊石形狀 細(xì)觀機(jī)理 顆粒旋轉(zhuǎn)

【摘要】：考慮塊石形狀為球體、正方體和長方體三種情況,通過正方體與球體相比較來探究塊石不同棱角度對(duì)膠結(jié)土石混合體力學(xué)特性的影響,通過長方體與正方體相比較來探究塊石不同球度對(duì)膠結(jié)土石混合體力學(xué)特性的影響.首先,基于不規(guī)則顆粒三維離散元精細(xì)模擬技術(shù)實(shí)現(xiàn)了正方體和長方體塊石數(shù)值模型的建立;然后建立含石量為30%和80%的塊石形狀分別為球體、正方體和長方體的膠結(jié)土石混合體三維離散元隨機(jī)結(jié)構(gòu)模型;最后,對(duì)土石混合體大三軸試驗(yàn)進(jìn)行顆粒流數(shù)值模擬,獲得了不同含石量、不同塊石形狀下膠結(jié)土石混合體的強(qiáng)度特征和變形特征,并分別就低、高兩種含石量下塊石形狀對(duì)土石混合體力學(xué)特性影響的細(xì)觀機(jī)理進(jìn)行了深入地分析.結(jié)果表明:塊石含量和形狀均會(huì)顯著影響膠結(jié)土石混合體的力學(xué)特性,并且兩者間具有復(fù)雜的交互作用;微裂紋、塊石顆粒平均旋轉(zhuǎn)量、應(yīng)變能和摩擦功等的演化規(guī)律能夠很好地從細(xì)觀水平上反映塊石形狀影響的作用機(jī)理.
[Abstract]:Considering that the rock shape is spherical, cuboid and cuboid, the influence of different edge angles of block stone on the mechanical properties of cemented soil-rock mixture is explored through the comparison of cube and sphere. Through the comparison of cuboids and cuboids to explore the impact of different sphericity of block stone on the mechanical properties of cemented soil-rock mixture. First of all. The numerical model of cuboid and cuboid block is established based on 3D discrete element fine simulation technology of irregular particles. Then, the three dimensional discrete element stochastic structure model of cemented earth and rock mixture with 30% and 80% rock contents is established, which is spherical, cuboid and cubohedral, respectively. Finally, the particle flow numerical simulation is carried out on the large triaxial test of soil-rock mixture, and the strength and deformation characteristics of cemented soil-rock mixture with different rock content and different rock shape are obtained, respectively. The effect of rock shape on the mechanical properties of soil-rock mixture is analyzed in detail. The results show that the content and shape of block stone can significantly affect the mechanical properties of cemented soil-rock mixture. And there is a complex interaction between the two; The evolution laws of microcracks, mean rotation of rock particles, strain energy and friction work can well reflect the mechanism of the effect of rock shape on the meso level.
【作者單位】： 武漢大學(xué)土木建筑工程學(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)基金面上項(xiàng)目(41272342)資助
【分類號(hào)】：TU43
【正文快照】： 0引言土石混合體(Soil-rock mixture,簡(jiǎn)稱SRM)是指第四紀(jì)以來形成的,由具有一定工程尺度、強(qiáng)度較高的塊石、細(xì)粒土體及孔隙構(gòu)成且具有一定含石量(Rock block proportion,簡(jiǎn)稱RBP)的極端不均勻松散巖土介質(zhì)系統(tǒng)[1].土石混合體在自然界中分布非常廣泛,地球上絕大多數(shù)滑坡體都是

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