【摘要】：樁承式加筋路堤受力性狀比較復(fù)雜,土拱效應(yīng)對(duì)路堤的承載變形性狀具有重要影響。通過三維土拱效應(yīng)模型試驗(yàn),研究樁-土相對(duì)位移、路堤高度、樁帽凈間距和水平加筋體拉伸強(qiáng)度等因素對(duì)樁土應(yīng)力比及路堤沉降的影響。結(jié)果表明:土拱效應(yīng)發(fā)揮程度與樁-土相對(duì)位移密切相關(guān),存在一個(gè)臨界樁-土相對(duì)位移使得樁土應(yīng)力比達(dá)到最大值,該臨界樁-土相對(duì)位移約為6~8 mm。路堤高度與樁帽凈間距之比越大,樁土應(yīng)力比越大,路堤頂面差異沉降越小;樁帽寬度與樁帽凈間距之比越大,樁土應(yīng)力比越大,路堤頂面差異沉降越小。設(shè)置水平加筋體能有效提高樁土應(yīng)力比并減小路堤頂面沉降;路堤越低,水平加筋體對(duì)樁土應(yīng)力比的提高作用及對(duì)路面沉降的減小作用越明顯;水平加筋體拉伸強(qiáng)度越高,這種作用越明顯。樁承式加筋路堤三維土拱效應(yīng)等沉面高度與樁帽凈間距之比約為3.5。
[Abstract]:The stress behavior of pile-supported reinforced embankment is complex, and the soil arch effect has an important influence on the bearing deformation behavior of embankment. The effects of pile-soil relative displacement, embankment height, net spacing of pile cap and tensile strength of horizontal reinforced body on pile-soil stress ratio and embankment settlement are studied by three-dimensional soil arch effect model test. The results show that the soil arch effect is closely related to the pile-soil relative displacement. There is a critical pile-soil relative displacement that makes the pile-soil stress ratio reach the maximum, and the critical pile-soil relative displacement is about 6 鈮，

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