本文關(guān)鍵詞：不同荷載水平及速率下超軟土水相核磁共振試驗(yàn)研究　出處：《物理學(xué)報(bào)》2014年01期 　論文類型：期刊論文

  更多相關(guān)文章： 荷載水平及速率 超軟土 核磁共振試驗(yàn) 水相變化

【摘要】：大規(guī)模建設(shè)中面臨越來越多的淤泥等超軟土地基處理,其目的是盡可能排出超軟土體中的水而使土體固結(jié),以改善其物理力學(xué)性能.靜動(dòng)力排水固結(jié)法試圖利用高能量沖擊而將超軟土中部分結(jié)合水轉(zhuǎn)換為自由水,進(jìn)而實(shí)現(xiàn)更多水的排出而有效固結(jié).然而,目前還不十分清楚能造成這種水相變化的沖擊荷載究竟要達(dá)到何種水平及速率.為此,在模擬條件的、淤泥土的不同類型荷載水平及速率試驗(yàn)基礎(chǔ)上,進(jìn)行核磁共振水相測試,探索了典型荷載水平及速率下這種超軟土中結(jié)合水可轉(zhuǎn)化為自由水的條件及規(guī)律,主要為:1)對應(yīng)于通常工程荷載的較低能量真三軸試驗(yàn)荷載速率與水平(1.6 MPa/s與100 kPa及以下),淤泥類超軟土中非自由水不能轉(zhuǎn)化為自由水.2)對應(yīng)于靜動(dòng)力排水固結(jié)法條件的高速?zèng)_擊荷載下(每擊荷載水平3787 kPa,速率631.2 MPa/s),非自由水可轉(zhuǎn)化為自由水;且沖擊總能量越大(遍數(shù)及擊數(shù)越多),就越易析出自由水.3)約束樣品的側(cè)限剛度對非自由水轉(zhuǎn)化為自由水的影響可忽略.
[Abstract]:In the large-scale construction, more and more ultra-soft soil foundation treatment, such as silt, its purpose is to discharge water from the ultra-soft soil as much as possible to make the soil consolidation. In order to improve its physical and mechanical properties, the static and dynamic drainage consolidation method attempts to use high energy impact to convert some combined water in ultra-soft soil into free water, and then realizes the discharge of more water and effective consolidation. At present, it is not very clear what level and rate of impact load can cause this kind of water phase change. Therefore, on the basis of simulating condition, different types of load level and rate of silt soil are tested. Nuclear magnetic resonance (NMR) water phase measurements were carried out to explore the conditions and rules that the combined water in the super soft soil could be converted into free water under typical load levels and rates. It is mainly 1: 1) the lower energy true triaxial test load rate and horizontal load rate corresponding to the normal engineering load are 1. 6 MPa/s and 100 kPa and below). The non-free water can not be transformed into free water. 2) it corresponds to the high speed impact load of static and dynamic drainage consolidation method (3 787 kPa per stroke load level). The rate is 631.2 MPA / s, and the non-free water can be transformed into free water. The larger the total impact energy (the more the number of times and hits, the easier it is to precipitate free water. 3) the effect of the lateral stiffness on the conversion of non-free water to free water can be neglected.
【作者單位】： 廣東工業(yè)大學(xué)巖土工程研究所;上海紐邁電子科技有限公司;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號:51178122)資助的課題~~
【分類號】：TU411
【正文快照】： 1引言近些年來,核磁共振(nuclear magnetic reso-nance,NMR)作為一個(gè)跨學(xué)科的測試技術(shù)方法用于研究不同砂巖巖石、催化劑、膠體和生物組織[1],并且越來越多地應(yīng)用于包括巖土介質(zhì)在內(nèi)的各種材料物理及幾何特征測試及估算,如用于水泥在水漸進(jìn)析出變化狀態(tài)下各類凝膠孔隙水特征[2

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