【摘要】：對取自遼河流域火渤鐵路沿線廣泛分布的細(xì)砂填料,開展顆粒分析、顆粒密度、相對密度和標(biāo)準(zhǔn)擊實(shí)等土工試驗(yàn);通過構(gòu)筑小型砂箱模型,進(jìn)行模擬壓實(shí)機(jī)械-土接觸形式的筒形、平面和凹形壓板對細(xì)砂填料壓實(shí)效果的對比試驗(yàn),分析壓板類型對位移場和干密度的影響規(guī)律。研究結(jié)果表明:細(xì)粒含量小的均勻級配細(xì)砂填料具有平緩的"√"型擊實(shí)曲線特征,在完全干燥或者充分濕潤下易獲得較大干密度。壓實(shí)機(jī)械-土接觸形式對細(xì)砂填料壓實(shí)特性及效果影響顯著,筒形接觸存在外擠作用和應(yīng)力集中特征,易導(dǎo)致無黏性細(xì)砂填料產(chǎn)生明顯橫向變形,甚至出現(xiàn)局部剪切破壞;平面和凹形接觸應(yīng)力相對均勻,具有一定側(cè)向約束能力,變形以壓密下沉為主,更適合細(xì)砂填料壓實(shí)。
[Abstract]:For the fine sand fillers which are widely distributed along the Huo-Bo railway line in the Liaohe River Basin, the geotechnical tests such as particle analysis, particle density, relative density and standard compaction are carried out. In this paper, the compaction effects of cylindrical, planar and concave compaction plates on fine sand packing were simulated, and the effects of plate type on displacement field and dry density were analyzed. The results show that the uniformly graded fine sand fillers with small fine grain content have the characteristics of flat "square" compaction curve, and the dry density is easy to be obtained under complete drying or full wetting. The compaction mechanical-soil contact form has a significant influence on the compaction characteristics and effects of fine sand fillers. The cylindrical contact has the characteristics of external squeezing and stress concentration, which can easily lead to obvious transverse deformation and even local shear failure of non-viscous fine sand fillers. The plane and concave contact stress is relatively uniform and has certain lateral restraint ability. The deformation is dominated by compaction subsidence and is more suitable for compaction of fine sand fillers.
【作者單位】： 西南交通大學(xué)土木工程學(xué)院;高速鐵路線路工程教育部重點(diǎn)實(shí)驗(yàn)室;沈陽鐵道勘察設(shè)計(jì)院有限公司;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展規(guī)劃(973計(jì)劃)項(xiàng)目(2013CB036204) 沈陽鐵道勘察設(shè)計(jì)院有限公司科研項(xiàng)目(2014-zx1409)
【分類號】：U416.1
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本文編號：2281972