發(fā)布時(shí)間：2018-04-13 06:00

  本文選題：路基工程 + 低填路堤�。� 參考：《深圳大學(xué)學(xué)報(bào)(理工版)》2014年05期

【摘要】：利用數(shù)值模擬試驗(yàn)研究低填路堤下土拱效應(yīng)的特性.通過建立三維土拱模型,研究影響土拱效應(yīng)的主要參數(shù)——樁布置形式、樁間距、填土高度和擴(kuò)大頭直徑間的相互關(guān)系.結(jié)果表明,無論是三角形還是正方形布置形式,釘形樁的應(yīng)力分布具有顯著的空間對稱性;在布置形式、填土高度和樁間距等參數(shù)一定的條件下,隨著釘形樁擴(kuò)大頭直徑的增加,土拱效應(yīng)發(fā)揮程度降低,當(dāng)擴(kuò)大頭較大,相鄰兩樁樁邊緣較近時(shí),群樁的擠土作用較明顯;在正方形樁體布置形式下,填土路堤中應(yīng)力分布較均勻,擠土作用下的土拱形態(tài)對稱性比三角形布置形態(tài)要好,但樁土應(yīng)力比卻并不一定比三角形的大.在設(shè)計(jì)中需要綜合考慮填土高度、擴(kuò)大頭直徑以及樁的布置形式等因素.
[Abstract]:The characteristics of soil arch effect under low fill embankment are studied by numerical simulation test.Through the establishment of a three-dimensional soil arch model, the relationships between the main parameters affecting the soil arch effect, such as pile layout, pile spacing, fill height and enlarged head diameter, are studied.The results show that the stress distribution of the nailed pile has significant spatial symmetry regardless of the triangular or square layout, and under certain conditions, such as layout form, filling height and pile spacing, etc.With the increase of the diameter of the expanded head of the nail pile, the soil arch effect is reduced. When the enlarged head is larger and the adjacent two piles are close to the edge, the compaction of the pile group is more obvious, and when the square pile body is arranged,The stress distribution in embankment is more uniform, and the symmetry of soil arch is better than that of triangular arrangement, but the pile-soil stress ratio is not always larger than that of triangle.Such factors as filling height, expanding head diameter and pile layout should be taken into account in the design.
【作者單位】： 湖北科技學(xué)院資源環(huán)境科學(xué)與工程學(xué)院;武漢大學(xué)土木建筑工程學(xué)院;
【基金】：湖北省自然科學(xué)基金資助項(xiàng)目(2012FFC01401)~~
【分類號】：U416.12

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