【摘要】：針對(duì)山區(qū)公路路基拓寬改建的特殊性,運(yùn)用非線性有限元法,開(kāi)展衡重式擋土墻修建、新路基逐層分步填筑的動(dòng)態(tài)施工力學(xué)行為數(shù)值模擬。針對(duì)新路基是否加筋、加筋層位以及衡重臺(tái)上下方新路基填土壓實(shí)狀況的差異性,對(duì)新舊路基穩(wěn)定安全性、滑動(dòng)面形態(tài)、沉降、擋土墻變位等力學(xué)響應(yīng)的影響開(kāi)展參數(shù)敏感性分析。結(jié)合室內(nèi)模擬墻體不同主動(dòng)位移模式下拓寬路基土工離心模型試驗(yàn)成果,考察新舊路基頂面沉降與擋土墻變位的動(dòng)態(tài)耦合關(guān)系。在山區(qū)公路路基拓寬改建動(dòng)態(tài)施工中,擋土墻的變位和新舊路基頂面沉降、差異沉降相互耦合,呈正相關(guān)關(guān)系。衡重臺(tái)下方新路基填土壓實(shí)不足會(huì)導(dǎo)致新舊路基頂面差異沉降增大。擋土墻主動(dòng)外傾誘發(fā)新舊路基頂面產(chǎn)生較大附加(差異)沉降,宜對(duì)新路基自重壓密作用造成的差異沉降予以適當(dāng)修正放大后進(jìn)行上承路面結(jié)構(gòu)設(shè)計(jì)。
[Abstract]:In view of the particularity of the widening and rebuilding of highway roadbed in mountainous area, the numerical simulation of dynamic construction mechanics behavior is carried out by using nonlinear finite element method to construct the retaining wall and fill the new roadbed step by step. In view of whether the new roadbed is reinforced, the difference of the reinforced layer and the compaction condition of the new roadbed under the balance platform, the stability and safety of the new subgrade, the form of sliding surface and the settlement of the new roadbed are discussed. Parameter sensitivity analysis was carried out on the influence of mechanical response such as displacement of retaining wall. The dynamic coupling relationship between the settlement of the new and old roadbed top surface and the displacement of retaining wall is investigated by combining the results of geo-centrifugal model test of widening roadbed with different active displacement modes of indoor simulated wall. In the dynamic construction of widening and rebuilding of highway roadbed in mountainous area, the displacement of retaining wall and the settlement of the new and old roadbed top surface are coupled with each other and have a positive correlation with each other. Insufficient compaction of the new embankment under the counterweight platform will increase the differential settlement of the new and old roadbed top surface. The active extroversion of retaining wall induces large additional (differential) settlement on the top surface of new and old subgrade. It is appropriate to modify and amplify the differential settlement caused by autoclave compaction of new subgrade and design the upper bearing pavement structure.
【作者單位】： 西南交通大學(xué)土木工程學(xué)院;西南交通大學(xué)道路工程四川省重點(diǎn)實(shí)驗(yàn)室;西南交通大學(xué)高速鐵路線路工程教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助(No.SWJTU12CX067);中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金資助(No.SWJTU12ZT05)
【分類號(hào)】：U418.8;U417.11

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃志福;;公路擋土墻CAD系統(tǒng)[J];交通與計(jì)算機(jī);1991年01期

2 陳由華;衡重式擋土墻質(zhì)量事故產(chǎn)生的原因及防治措施[J];林業(yè)建設(shè);1999年04期

3 余志宇;樁基托梁擋土墻設(shè)計(jì)探討[J];四川林勘設(shè)計(jì);2005年03期

4 童第科;;衡重式擋墻在山區(qū)公路路基病害處治中的應(yīng)用[J];合肥工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年10期

5 黃玉和;;衡重式擋墻處治山區(qū)公路路基垮塌病害實(shí)例[J];福建建筑;2009年11期

6 陳麗;王齊榮;;重力式和衡重式擋土墻抗震性能研究[J];路基工程;2010年04期

7 趙明華,彭建國(guó),鄒新軍;基于新型混合遺傳算法的衡重式擋土墻優(yōu)化設(shè)計(jì)與應(yīng)用[J];中南公路工程;2002年04期

8 鄒新軍,趙明華,劉代全;公路衡重式擋土墻優(yōu)化設(shè)計(jì)方法與應(yīng)用研究[J];公路;2003年01期

9 李凱榮;;高壓注漿在神華集團(tuán)進(jìn)廠道路地基處理中的應(yīng)用[J];甘肅科技;2009年21期

10 曹英煊;;單側(cè)突變截面處應(yīng)力計(jì)算的探討[J];路基工程;1986年04期

相關(guān)碩士學(xué)位論文 前3條

1 羅樂(lè);衡重式擋土墻抗震性能研究[D];西南交通大學(xué);2013年

2 耿建宇;公路路基拓寬改建力學(xué)行為及典型工程對(duì)策研究[D];西南交通大學(xué);2013年

3 韓冬;低等級(jí)公路新型廉價(jià)支擋結(jié)構(gòu)物開(kāi)發(fā)[D];重慶交通大學(xué);2011年

，

本文編號(hào)：2362781