本文選題：節(jié)理裂隙　切入點(diǎn)：增濕-減濕　出處：《工程地質(zhì)學(xué)報(bào)》2017年02期

【摘要】：黃土內(nèi)部存在各種裂隙,增濕-減濕作用導(dǎo)致原狀黃土內(nèi)部裂隙不斷發(fā)展演化,因此研究在增濕-減濕作用下黃土裂隙發(fā)育演化規(guī)律具有非常重要的意義。以陜北延安地區(qū)某邊坡黃土為研究對(duì)象,通過(guò)CT掃描技術(shù)獲得了增濕-減濕作用下土樣細(xì)觀結(jié)構(gòu)變化圖,得到了土樣CT數(shù)ME及SD值隨土樣增濕-減濕作用的變化曲線。研究結(jié)果表明:隨著土體濕度的增加,土體內(nèi)部損傷速率緩慢增加,當(dāng)含水率超過(guò)土樣塑限后,土體內(nèi)部損傷速率加快,含水率超過(guò)一定值時(shí),速度又減緩,CT數(shù)的均值和方差隨含水率變化皆呈反"S"曲線;隨著干濕循環(huán)次數(shù)的增加,土樣微裂紋逐漸發(fā)育,表現(xiàn)為伸長(zhǎng)變寬,呈不規(guī)則的分叉、甚至貫通;4次干濕循環(huán)后,土樣裂隙裂縫基本成了網(wǎng)狀,土樣較破碎,此時(shí)CT數(shù)的均值和方差變化不大;干濕循環(huán)幅度越大,土樣內(nèi)部損傷程度也越大,土樣內(nèi)部節(jié)理裂隙發(fā)展也就越快。
[Abstract]:There are all kinds of cracks in loess. The effect of humidification and desiccating causes the internal cracks of undisturbed loess to develop and evolve continuously. Therefore, it is of great significance to study the development and evolution of loess fissures under the action of humidification and dehumidification. The microstructure changes of soil samples under the action of humidification and dehumidification were obtained by CT scanning technique, and the curves of soil CT number ME and SD value with soil sample humidification and moisture desiccation were obtained. The results showed that: with the increase of soil moisture, The internal damage rate of soil increases slowly. When the moisture content exceeds the plastic limit of soil sample, the damage rate of soil is accelerated, and when the moisture content exceeds a certain value, the mean value and variance of CT number slow down with the change of water content are all in inverse "S" curve. With the increase of dry-wet cycle times, the microcracks of soil samples develop gradually, showing that the microcracks of soil samples grow wider and become irregular bifurcations. Even after four dry-wet cycles, the cracks of soil samples are basically reticulated, and the soil samples are relatively broken. At this time, the mean and variance of CT number change little; the larger the range of dry and wet circulation, the greater the damage degree of soil sample, and the faster the development of joints and fractures in soil sample.
【作者單位】： 西安科技大學(xué)建筑與土木工程學(xué)院;四川省眉山市彭山區(qū)住房和城鄉(xiāng)規(guī)劃建設(shè)局;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41672305,41172262) 陜西省重點(diǎn)科技創(chuàng)新團(tuán)隊(duì)計(jì)劃(2014KCT-30)資助
【分類(lèi)號(hào)】：P642.131

【相似文獻(xiàn)】

相關(guān)期刊論文 前2條

1 鄧檢良;許強(qiáng);龍岡文夫;;高嶺土一維增濕的濕陷-流變分析方法研究[J];巖土力學(xué);2013年10期

2 ;[J];;年期

相關(guān)碩士學(xué)位論文 前2條

1 熊瀏陽(yáng);壓實(shí)黃土增濕特性及數(shù)值模擬研究[D];蘭州大學(xué);2015年

2 孫明星;氯鹽漬土增濕變形特性研究[D];西北農(nóng)林科技大學(xué);2008年

，

本文編號(hào)：1678511