本文選題：土石混合體　切入點(diǎn)：直剪試驗(yàn)　出處：《巖土工程學(xué)報(bào)》2017年08期 　論文類型：期刊論文

【摘要】：土石混合體剪切時(shí)存在細(xì)觀上的顆粒破碎現(xiàn)象,并對(duì)其宏觀力學(xué)性質(zhì)產(chǎn)生影響�；诖�,以4種含水率的土石混合體為研究對(duì)象,通過室內(nèi)大型直剪試驗(yàn)和篩分試驗(yàn),分析土石混合體剪切后的顆粒破碎特征,并建立細(xì)觀顆粒破碎與宏觀力學(xué)性質(zhì)的聯(lián)系,從而加深對(duì)宏觀力學(xué)性質(zhì)的認(rèn)識(shí)。研究結(jié)果表明:土石混合體剪切后的顆粒破碎較明顯,可分為完全剪斷型、表面破裂型和表面研磨型3類;顆粒破碎細(xì)觀上表現(xiàn)為粗粒組含量降低、細(xì)粒組含量增加、中等粒組含量波動(dòng)變化,統(tǒng)計(jì)上表現(xiàn)為級(jí)配曲線上移,宏觀上表現(xiàn)為低含水率出現(xiàn)應(yīng)變軟化破壞、高含水率出現(xiàn)應(yīng)變硬化破壞、中等含水率出現(xiàn)塑性應(yīng)變破壞、剪應(yīng)力 剪切位移曲線"跳躍"和強(qiáng)度非線性特征,本質(zhì)上是顆粒間接觸力作用產(chǎn)生應(yīng)力集中的結(jié)果;顆粒相對(duì)破碎率隨著含水率的降低或法向壓力的增大而增大;黏聚力和內(nèi)摩擦角均隨著含水率的增大而呈冪函數(shù)規(guī)律降低。
[Abstract]:There exists the phenomenon of particle breakage in the soil and rock mixture during shear, which has an effect on its macroscopic mechanical properties. Based on this, four kinds of soil and rock mixtures with different moisture content are taken as the research object, and the large scale direct shear test and screening test are carried out in the laboratory. The characteristics of particle breakage after shear of soil-rock mixture are analyzed, and the relationship between micro-particle breakage and macroscopic mechanical properties is established, so as to deepen the understanding of macroscopic mechanical properties. The results show that the particle breakage of soil-rock mixture after shear is obvious. It can be divided into three types: complete shearing type, surface rupture type and surface grinding type, the content of coarse grains decreases, the content of fine grains increases, the content of medium grains fluctuates, and the gradation curve moves up statistically, the content of coarse grains decreases, the content of fine grains increases, the content of medium grains fluctuates, and the statistics shows that the gradation curve is upward. Macroscopically, there are strain softening failure in low moisture content, strain hardening failure in high moisture content, plastic strain failure in medium moisture content, "jump" in shear stress and shear displacement curve and nonlinear strength. In essence, it is the result of stress concentration caused by contact force between particles; the relative breaking rate of particles increases with the decrease of water content or the increase of normal pressure; the cohesion force and the angle of internal friction decrease with the increase of water content, and the law of power function decreases.
【作者單位】： 重慶大學(xué)土木工程學(xué)院;山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室(重慶大學(xué));中鐵重慶地鐵建設(shè)指揮部;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41372356) 高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金項(xiàng)目(20110191120033) 中央高校基本科研業(yè)務(wù)費(fèi)科研專項(xiàng)自然科學(xué)類項(xiàng)目(CDJZR12200012)
【分類號(hào)】：TU43

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