發(fā)布時(shí)間：2018-08-01 09:29

【摘要】：本文對(duì)不同吸力的南陽弱膨脹土進(jìn)行了一系列吸力控制的三軸剪切試驗(yàn)。試驗(yàn)結(jié)果表明:在凈應(yīng)力相同的條件下,試樣的應(yīng)力應(yīng)變關(guān)系曲線隨著吸力的增加而升高、剪縮體變小,并且隨著吸力的增加其應(yīng)力比-應(yīng)變關(guān)系與強(qiáng)度、體變表現(xiàn)出類似超固結(jié)土的特性明顯。其主要原因是試樣受到較大的吸力,有效應(yīng)力增加,弱膨脹土試樣失水收縮、孔隙比減小均明顯,使試樣剪切過程中表現(xiàn)出類似超固結(jié)黏土的特性。吸力所引起弱膨脹性土體積收縮明顯,不可忽視。因此預(yù)測(cè)非飽和弱膨脹性土的應(yīng)力應(yīng)變關(guān)系和強(qiáng)度特性需考慮吸力所引起的體積收縮影響。
[Abstract]:In this paper, a series of triaxial shear tests controlled by suction are carried out on Nanyang weakly expansive soil with different suction forces. The experimental results show that under the same net stress, the stress-strain relationship curve increases with the increase of suction, and the shear shrinkage becomes smaller, and the stress-to-strain relationship and strength increase with the increase of suction. Bulk deformation shows obvious characteristics similar to that of overconsolidated soil. The main reason is that the specimen is subjected to a larger suction, the effective stress increases, the weak expansive soil sample loses water and shrinks obviously, and the void ratio decreases obviously, which makes the specimen exhibit similar characteristics of overconsolidated clay in the shear process. The volume shrinkage of weakly expansive soil caused by suction can not be ignored. Therefore, to predict the stress-strain relationship and strength characteristics of unsaturated weakly expansive soils, the effect of volume shrinkage caused by suction should be considered.
【作者單位】： 華北水利水電大學(xué)河南省巖土力學(xué)與結(jié)構(gòu)工程重點(diǎn)實(shí)驗(yàn)室;上海大學(xué)土木工程系;
【基金】：國家自然科學(xué)基金項(xiàng)目(11272194) 河南省基礎(chǔ)與前沿研究計(jì)劃項(xiàng)目(132300410021) 華北水利水電大學(xué)高層次人才基金項(xiàng)目
【分類號(hào)】：TU443
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本文編號(hào)：2157133