本文關(guān)鍵詞： 膠結(jié)鋁球 微觀模型試驗(yàn) 環(huán)氧樹脂 高鋁水泥　出處：《同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年11期 　論文類型：期刊論文

【摘要】：離散單元法被廣泛應(yīng)用于顆粒材料的力學(xué)特性研究,建立合理的膠結(jié)微觀接觸理論對(duì)實(shí)現(xiàn)膠結(jié)型巖土材料宏觀、微觀力學(xué)特性的數(shù)值分析顯得尤為重要.首先通過室內(nèi)三維接觸試驗(yàn)方法制備由環(huán)氧樹脂和高鋁水泥膠結(jié)的鋁球試樣,并使用輔助加載裝置進(jìn)行拉伸、壓縮、剪切、彎曲及扭轉(zhuǎn)5種加載方式下的接觸力學(xué)特性測(cè)試,為建立三維微觀接觸模型奠定試驗(yàn)基礎(chǔ).結(jié)果表明,膠結(jié)鋁球顆粒的接觸力學(xué)響應(yīng)及強(qiáng)度包線與膠結(jié)物類型有關(guān).在峰值前,膠結(jié)鋁球的力-位移與力矩-轉(zhuǎn)角變化關(guān)系曲線表現(xiàn)為線彈性;在峰值后,表現(xiàn)為環(huán)氧樹脂偏塑性、高鋁水泥偏脆性;法向作用力對(duì)膠結(jié)接觸力學(xué)特性有重要影響,不同膠結(jié)鋁球的抗剪、抗彎、抗扭能力隨著法向作用力的增大呈現(xiàn)先增大后減小趨勢(shì),存在臨界法向應(yīng)力比;在不同荷載空間下,不同膠結(jié)鋁球顆粒的歸一化峰值強(qiáng)度包線(剪切強(qiáng)度、彎矩、扭矩-法向荷載)近似呈拋物線型.
[Abstract]:The discrete element method is widely used in the study of mechanical properties of granular materials, and the establishment of a reasonable cemented micro-contact theory for the realization of cemented rock and soil materials macro. Numerical analysis of microscopic mechanical properties is particularly important. Firstly, aluminum ball specimens cemented by epoxy resin and high aluminum cement are prepared by three dimensional contact test method in laboratory, and tensile and compression are carried out with auxiliary loading device. The test results of contact mechanical properties under shear, bending and torsion loading provide the experimental basis for the establishment of three-dimensional micro-contact model. The contact mechanical response and the strength envelope of the cemented aluminum ball particles are related to the type of the cemented aluminum ball. Before the peak value, the curve of the relationship between the force, displacement, torque and rotation angle of the cemented aluminum ball is linear elasticity. After the peak value, the epoxy resin is partial plastic, and the high aluminum cement is partial brittleness. The normal force has an important effect on the contact mechanical properties of the cement. The shear, bending and torsion resistance of different bonded aluminum balls increase first and then decrease with the increase of the normal force, and there is a critical normal stress ratio. Under different loading space, the normalized peak strength envelope (shear strength, bending moment, torque-normal load) of different cemented aluminum ball particles is approximately parabola.
【作者單位】： 同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室;同濟(jì)大學(xué)巖土及地下工程教育部重點(diǎn)實(shí)驗(yàn)室;同濟(jì)大學(xué)土木工程學(xué)院;天津大學(xué)土木工程系;
【基金】：國(guó)家“九七三”重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2014CB046901) 國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(51639008) 同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室項(xiàng)目(SLDRCE14-A-04)
【分類號(hào)】：TU43
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本文編號(hào)：1493443