本文選題：顆粒材料 + 真三軸試驗(yàn)��； 參考：《水利學(xué)報(bào)》2017年09期

【摘要】：臨界狀態(tài)通常作為砂土等顆粒材料本構(gòu)模型中的一種參考狀態(tài),是經(jīng)典土力學(xué)框架的一個(gè)重要組成部分。根據(jù)砂土的細(xì)觀結(jié)構(gòu)特性,一些學(xué)者提出了描述砂土內(nèi)部結(jié)構(gòu)特性的狀態(tài)參量,建立了狀態(tài)相關(guān)的剪脹模型。然而受試驗(yàn)條件的限制,目前多采用常規(guī)三軸試驗(yàn)研究顆粒材料的臨界狀態(tài)和剪脹特性,未考慮中主應(yīng)力因素。已有研究表明加載路徑對顆粒材料的力學(xué)特性有一定影響,本文采用離散單元法模擬了顆粒材料真三軸應(yīng)力路徑試驗(yàn),分析了加載過程中顆粒材料的應(yīng)力應(yīng)變特性及中主應(yīng)力對臨界狀態(tài)的影響。結(jié)果表明:顆粒材料的臨界狀態(tài)線(CSL)在e-lg p平面內(nèi)是唯一的,與中主應(yīng)力系數(shù)無關(guān)。臨界狀態(tài)應(yīng)力比與應(yīng)力羅德角的關(guān)系可以采用角隅函數(shù)近似表達(dá)�；跔顟B(tài)相關(guān)的剪脹理論,采用Lode角的函數(shù)(角隅函數(shù))表示模型參數(shù),提出一個(gè)新的應(yīng)力-剪脹模型。數(shù)值試驗(yàn)結(jié)果表明,本文采用的三維剪脹模型能夠較好地反映了離散元數(shù)值模擬中顆粒材料在三維應(yīng)力路徑下的剪脹特性,然而公式的適用性需要更多的試驗(yàn)驗(yàn)證和理論研究。
[Abstract]:The critical state is usually used as a reference state in the constitutive model of granular materials such as sand. It is an important part of the classical soil mechanics frame. According to the meso-structure characteristics of sand, some scholars put forward the state parameters to describe the internal structural characteristics of sand, and established a state dependent shear expansion model. However, due to the limitation of test conditions, conventional triaxial tests are often used to study the critical state and shear dilatancy of granular materials without considering the medium principal stress factors. It has been shown that the loading path has a certain influence on the mechanical properties of the granular material. In this paper, the true triaxial stress path test of the granular material is simulated by using the discrete element method. The stress-strain characteristics of granular materials during loading and the effect of intermediate principal stress on critical state are analyzed. The results show that the critical state line of granular material is unique in the e-lg p plane and independent of the intermediate principal stress coefficient. The relation between critical stress ratio and stress Luo De angle can be expressed by corner function. Based on the state-dependent theory of shear expansion, a new stress-shear expansion model is proposed by using the function of Lode angle (corner function) to represent the parameters of the model. The results of numerical experiments show that the three-dimensional dilatancy model in this paper can well reflect the dilatancy characteristics of granular materials under three-dimensional stress paths in discrete element numerical simulation. However, the applicability of the formula needs more experimental verification and theoretical research.
【作者單位】： 武漢大學(xué)水資源與水電工程科學(xué)國家重點(diǎn)實(shí)驗(yàn)室;水工巖石力學(xué)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金面上項(xiàng)目(51579193);國家自然科學(xué)基金青年基金項(xiàng)目(51509190) 中國博士后科學(xué)基金面上項(xiàng)目(2016T907272)
【分類號】：TV223

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