【摘要】：基于考慮含石量、含水率、塊石巖性、初始孔隙比、法向壓力5個(gè)影響因素的土石混合體室內(nèi)大型直剪試驗(yàn),利用剪切面在分形幾何學(xué)上的統(tǒng)計(jì)規(guī)律和顆粒流數(shù)值模擬方法得到的直剪試驗(yàn)中顆粒的相互作用規(guī)律,對(duì)土石混合體的抗剪強(qiáng)度產(chǎn)生機(jī)制進(jìn)行研究。結(jié)果表明:(1)土石混合體的剪切面呈不規(guī)則的起伏形態(tài)與塊石的存在關(guān)系密切,且具有較好的分形特征,分形維數(shù)隨著含石量和塊石強(qiáng)度的增大、含水率和法向壓力的減小均呈增大趨勢(shì);(2)含石量高于40%時(shí),黏聚力小于30 k Pa;(3)內(nèi)摩擦角隨著含石量的增大、塊石強(qiáng)度的增大、含水率的降低、初始孔隙比的降低、法向壓力的降低均呈增大規(guī)律,且與分形維數(shù)滿(mǎn)足正相關(guān)函數(shù)關(guān)系;(4)塊石附近應(yīng)力集中較明顯,剪切過(guò)程中,顆粒間的接觸力主要通過(guò)迎著剪切方向的接觸面?zhèn)鬟f,而背著剪切方向的顆粒接觸面基本不傳遞力;(5)內(nèi)摩擦角φ等于剪切面上與顆粒本身接觸性質(zhì)有關(guān)的接觸面內(nèi)摩擦角θ0和與剪切面分形維數(shù)有關(guān)的接觸面傾角θi之和,利用此機(jī)制可解釋直剪試驗(yàn)中強(qiáng)度參數(shù)的變化規(guī)律。
[Abstract]:Based on the laboratory direct shear test of soil-rock mixture considering five factors including rock content, water content, block lithology, initial void ratio and normal pressure, Based on the statistical law of shear surface in fractal geometry and the interaction law of particle in direct shear test, the mechanism of shear strength of soil-rock mixture is studied. The results show that: (1) the shear surface of soil-rock mixture is closely related to the existence of massive rock and has good fractal characteristics, and the fractal dimension increases with the increase of rock content and rock strength. (2) when the rock content is higher than 40, the cohesion force is less than 30 k Pa; (3) the internal friction angle increases with the increase of rock content, the strength of block rock increases, the water content decreases, and the initial porosity decreases. The decrease of normal pressure increases and the fractal dimension satisfies the positive correlation function. (4) the stress concentration near the block rock is obvious, and the contact force between particles is mainly transmitted through the contact surface in the direction of shear during shear. (5) the internal friction angle 蠁 is equal to the sum of the internal friction angle 胃 _ 0 of the contact surface related to the contact property of the particle itself and the dip angle 胃 _ I of the contact surface related to the fractal dimension of the shear surface. This mechanism can be used to explain the variation of strength parameters in direct shear test.
【作者單位】： 重慶大學(xué)土木工程學(xué)院;重慶大學(xué)山地城鎮(zhèn)建設(shè)與新技術(shù)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(51108485,41372356) 高等學(xué)校博士學(xué)科點(diǎn)專(zhuān)項(xiàng)科研基金資助項(xiàng)目(20110191120033)~~
【分類(lèi)號(hào)】：TU411.7

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