本文選題：膨脹土 + 干濕循環(huán)��； 參考：《巖土力學(xué)》2017年03期

【摘要】：采用常規(guī)直剪儀對干濕循環(huán)作用下的非飽和膨脹土進(jìn)行了不排水剪切試驗(yàn),獲得了不同含水率試樣的總應(yīng)力抗剪強(qiáng)度指標(biāo),可采用總黏聚力和總內(nèi)摩擦角來反映土體的不排水抗剪性能;采用濾紙法測定了剪切完成后試樣固定剪切面的基質(zhì)吸力,結(jié)合直剪試驗(yàn)結(jié)果建立了全吸力范圍內(nèi)非飽和膨脹土的抗剪強(qiáng)度模型,通過試驗(yàn)對比驗(yàn)證了模型的合理性。干濕循環(huán)會(huì)顯著降低膨脹土的不排水抗剪強(qiáng)度,其中對土體總黏聚力的削弱程度遠(yuǎn)大于對總內(nèi)摩擦角的削弱程度。總應(yīng)力抗剪強(qiáng)度指標(biāo)與基質(zhì)吸力的對數(shù)值近似為線性關(guān)系,土體抗剪強(qiáng)度隨著基質(zhì)吸力的增加而非線性增大,增大速率逐漸減小。試驗(yàn)結(jié)果表明,采用常規(guī)直剪儀和濾紙法開展干濕循環(huán)條件下非飽和膨脹土的抗剪強(qiáng)度研究是可行的。
[Abstract]:The undrained shear test of unsaturated expansive soil under dry and wet cycle was carried out by using a conventional direct shear apparatus. The total stress shear strength index of samples with different moisture content was obtained. The total cohesive force and the total internal friction angle can be used to reflect the undrained shear properties of the soil, and the matrix suction of the fixed shear surface of the sample after shearing is measured by the filter paper method. The shear strength model of unsaturated expansive soil in the range of full suction is established based on the results of direct shear test. The rationality of the model is verified by experiments. The undrained shear strength of expansive soil can be significantly reduced by dry-wet cycle, and the degree of weakening the total cohesive force of soil is much greater than that of the total angle of internal friction. The logarithmic relationship between the total stress shear strength index and the matrix suction is approximately linear. The shear strength of the soil increases nonlinearly with the increase of the matrix suction, and the increasing rate decreases gradually. The experimental results show that it is feasible to study the shear strength of unsaturated expansive soil under dry and wet circulation by using conventional direct shear apparatus and filter paper method.
【作者單位】： 南昌航空大學(xué)無損檢測技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;南昌航空大學(xué)土木建筑學(xué)院;云南農(nóng)業(yè)大學(xué)水利學(xué)院;
【基金】：國家自然科學(xué)基金（No.51408291，No.41662021) 南昌航空大學(xué)無損檢測技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室開放基金（No.ZD201529002） 江西省交通運(yùn)輸廳重點(diǎn)科技項(xiàng)目（No.2013C0006） This work was supported by the National Natural Science Foundation of China (51408291, 41662021), the Open Fund of Key Laboratory of Nondestructive Testing of the Ministry of Education (ZD201529002) and the Key Technology Program of the Communications Department of Jiangxi Province (2013C0006)
【分類號】：TU443

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本文編號：1918774