發(fā)布時(shí)間：2018-01-19 20:52

  本文關(guān)鍵詞： 膨脹巖 干濕循環(huán) 崩解 粒度熵 崩解比　出處：《巖土力學(xué)》2017年07期 　論文類(lèi)型：期刊論文

【摘要】：膨脹巖是一種特殊軟巖,在干濕循環(huán)作用下容易崩解泥化。針對(duì)延吉膨脹巖,開(kāi)展干濕循環(huán)作用下膨脹巖浸水崩解試驗(yàn),研究其粒徑變化規(guī)律。根據(jù)干濕循環(huán)后粒徑分布,引入標(biāo)準(zhǔn)基礎(chǔ)熵表征膨脹巖崩解特性,并與崩解比進(jìn)行類(lèi)比分析。研究結(jié)果表明:各粒組含量在前3次干濕循環(huán)中變化較大,第3次干濕循環(huán)后逐漸趨于穩(wěn)定;隨著干濕循環(huán)次數(shù)的增加,粗顆粒含量逐漸減少,細(xì)顆粒含量增加,土顆粒大小經(jīng)歷了由均勻到不均勻,再到均勻的過(guò)程;標(biāo)準(zhǔn)基礎(chǔ)熵與崩解比存在明顯的線(xiàn)性負(fù)相關(guān)關(guān)系,標(biāo)準(zhǔn)基礎(chǔ)熵隨著崩解比的增大而減小,表明利用標(biāo)準(zhǔn)基礎(chǔ)熵表征顆粒分布規(guī)律是合理可行的;隨著干循環(huán)次數(shù)的增加,標(biāo)準(zhǔn)基礎(chǔ)熵先減小,后逐漸穩(wěn)定,與級(jí)配曲線(xiàn)及其衍生指標(biāo)變化規(guī)律相同,再次驗(yàn)證該方法的可行性和適用性,為膨脹巖的崩解破碎分析提供一種新的量化指標(biāo);膨脹巖路塹邊坡開(kāi)挖以后,應(yīng)及時(shí)采取防水保濕措施,防止發(fā)生崩解泥化現(xiàn)象。
[Abstract]:Expansive rock is a kind of special soft rock, which is easy to collapse and muddy under the action of dry and wet cycle. In view of Yanji expansive rock, water immersion disintegration test of expansive rock under dry and wet circulation is carried out. According to the particle size distribution after dry-wet cycle, the standard basic entropy was introduced to characterize the collapse characteristics of expansive rock. The results showed that the contents of the grains changed greatly in the first three dry and wet cycles, and tended to be stable after the third dry and wet cycles. With the increase of dry and wet cycles, the content of coarse particles decreases gradually, and the content of fine particles increases, and the particle size of soil goes from uniform to uneven and then to uniform. There is an obvious linear negative correlation between the standard basic entropy and the disintegration ratio, and the standard basic entropy decreases with the increase of the disintegration ratio, which indicates that it is reasonable and feasible to use the standard basic entropy to characterize the particle distribution law. With the increase of dry cycle times, the standard basic entropy decreases first and then stabilizes gradually, which is the same as the gradation curve and its derivative index, which verifies the feasibility and applicability of the method again. It provides a new quantitative index for the breakup analysis of expansive rock. After excavation of expansive rock cutting slope, waterproof and moisturizing measures should be taken in time to prevent sloughing.
【作者單位】： 中國(guó)科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(No.41430634) 巖土力學(xué)與工程國(guó)家重點(diǎn)實(shí)驗(yàn)室自主部署項(xiàng)目(No.Y11002)~~
【分類(lèi)號(hào)】：TU45
【正文快照】： 膨脹巖是指能與水發(fā)生物理化學(xué)反應(yīng),易風(fēng)化和易軟化的一類(lèi)特殊軟巖,失水后吸水,常常會(huì)產(chǎn)生不均勻膨脹,發(fā)生泥化崩解現(xiàn)象[1]。膨脹巖土在我國(guó)分布廣泛,一直是困擾我國(guó)巖土工程建設(shè)的難題,從南京紅山窯水利樞紐到南水北調(diào)中線(xiàn)總干渠,從百色盆地云桂鐵路工程到延吉盆地吉琿鐵路客

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 田海;孔令偉;趙，

本文編號(hào)：1445499