本文選題：粗粒土 + 三軸試驗(yàn)��； 參考：《巖土力學(xué)》2014年11期

【摘要】：剪脹性是土體顯著區(qū)別于一般彈性材料的基本特性,與土體的強(qiáng)度和變形特性密切相關(guān)。通過4組不同初始密度的塔城砂礫石常規(guī)大型三軸試驗(yàn),研究剪脹性對粗粒土強(qiáng)度和變形特性的影響。試驗(yàn)結(jié)果表明,(1)若體變速率(體變和軸向應(yīng)變均以壓縮為正)先從正值減小到負(fù)值并達(dá)到最小值,隨后又有所增大但仍小于0,則應(yīng)力-應(yīng)變曲線為軟化型,在比值為最小值時土體剪脹性最大,對應(yīng)于峰值強(qiáng)度,若體變速率從某一正值單調(diào)減小并一直大于0,則應(yīng)力-應(yīng)變曲線為硬化型;(2)體變變化趨勢取決于剪脹性和壓縮性的大小,剪切后期若剪脹速率大于壓縮速率,則體變先壓縮后膨脹,應(yīng)力-應(yīng)變曲線呈軟化型,反之若剪脹速率小于壓縮速率,則體變一直是壓縮的,應(yīng)力-應(yīng)變曲線呈硬化型。研究結(jié)果對于加深認(rèn)識粗粒土的強(qiáng)度和變形特性具有重要意義。
[Abstract]:Shear dilatancy is the basic characteristic of soil which is obviously different from the general elastic material and is closely related to the strength and deformation of soil. The influence of shear dilatancy on the strength and deformation of coarse grained soil was studied by four groups of conventional triaxial tests with different initial densities of sand and gravel in Tacheng. The experimental results show that the stress-strain curve is softened if the volume variation rate (both volume strain and axial strain are compressible as positive) from positive to negative and reach the minimum value, and then increase but still less than 0, then the stress-strain curve is softened. When the ratio is the minimum, the shear dilatancy of the soil is the largest, corresponding to the peak strength. If the volume variation rate decreases from a certain positive monotone and is always greater than 0, then the stress-strain curve is the hardening type and the variation trend of the body deformation depends on the magnitude of the shear expansion and compressibility. At the later stage of shear expansion, if the expansion rate is greater than the compression rate, the volume deformation first compresses and then expands, and the stress-strain curve is softened. Otherwise, if the shear expansion rate is less than the compression rate, the volume deformation is always compressed, and the stress-strain curve is hardening. The results are of great significance for further understanding the strength and deformation characteristics of coarse-grained soil.
【作者單位】： 南京工程學(xué)院建筑工程學(xué)院;長江科學(xué)院水利部巖土力學(xué)與工程重點(diǎn)實(shí)驗(yàn)室;
【基金】：長江科學(xué)院開放研究基金資助項(xiàng)目(No.CKWV2013205/KY) 南京工程學(xué)院校級科研基金項(xiàng)目資助(No.YKJ201330)
【分類號】：TU443;TU411

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 姜景山;劉漢龍;程展林;丁紅順;左永振;;密度和圍壓對粗粒土力學(xué)性質(zhì)的影響[J];長江科學(xué)院院報;2009年08期

2 魏汝龍;;娭土的剪，

本文編號：1854895