【摘要】：隨著當(dāng)前交通量的迅速增長(zhǎng),高速公路面臨著擴(kuò)建加寬的問題,尤其是對(duì)于軟土地基段高速公路的加寬需要進(jìn)行更為復(fù)雜的分析與處理�，F(xiàn)有高速公路的加寬沒有成熟的經(jīng)驗(yàn)可循,并且從設(shè)計(jì)到施工存在很多約束條件;另外,已完成的加寬工程中存在著一些技術(shù)問題,工程效果不能得到保證。因而對(duì)軟基高速公路加寬進(jìn)行系統(tǒng)研究十分迫切。首先,本文分析了高速公路加寬后產(chǎn)生的病害與處置技術(shù)。列出了一些主要的病害并從理論上分析了病害產(chǎn)生的原因,以及一些處理路基病害的技術(shù)方法。然后,通過對(duì)施工段k79的工況分析,包括CFG樁與旋噴樁兩種方式,通過施工與計(jì)算得到提高承載力的方法,并用數(shù)值模擬,描繪出沉降曲線圖,分析關(guān)于地基沉降的問題,比較兩種樁處理方式的優(yōu)劣,對(duì)未來施工提出合理的建議。最后,通過實(shí)驗(yàn)的方法對(duì)老路基邊坡的狀態(tài)進(jìn)行了調(diào)查,包括了多個(gè)角度:沿橫斷面的分布、沿高度的分布、堤身狀態(tài)分析、邊坡臺(tái)階開挖試驗(yàn)、搭接處補(bǔ)強(qiáng)技術(shù)等。同時(shí)看出大部分老路堤邊坡土體的壓實(shí)度達(dá)不到設(shè)計(jì)要求,因此采用強(qiáng)力夯實(shí)機(jī)追密技術(shù)對(duì)邊坡新老路基搭接部位進(jìn)行補(bǔ)強(qiáng),并利用液態(tài)粉煤灰回填技術(shù)解決橋頭跳車、臺(tái)背回填沉降等問題。
[Abstract]:With the rapid growth of traffic volume, the expressway is faced with the problem of expansion and widening, especially for the soft soil section of the highway widening needs to be more complex analysis and treatment. There is no mature experience in the widening of the existing freeway, and there are many constraints from design to construction. In addition, there are some technical problems in the completed widening project, and the engineering effect can not be guaranteed. Therefore, it is very urgent to study the widening of soft-foundation expressway systematically. First of all, this paper analyzes the disease and disposal technology after highway widening. Some main diseases are listed and the causes of these diseases are analyzed theoretically, as well as some technical methods to deal with subgrade diseases. Then, through the analysis of the working conditions of K79 in the construction section, including CFG pile and rotary jet pile, the method of improving the bearing capacity is obtained by construction and calculation, and the settlement curve is described by numerical simulation, and the problems about foundation settlement are analyzed. The advantages and disadvantages of the two kinds of pile treatment are compared, and reasonable suggestions for future construction are put forward. Finally, the state of the old roadbed slope is investigated by the experimental method, including the distribution along the cross section, the distribution along the height, the analysis of the state of the embankment, the excavation test of the slope step, the reinforcement technology at the lap joint and so on. At the same time, it can be seen that the compaction degree of most of the old embankment slope soil can not meet the design requirements, so the new and old embankment overlapped parts of the slope are reinforced by using the strong compaction machine and the liquid fly ash backfill technology is used to solve the bridge-head jump. Backfill settlement of abutment and so on.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 武海燕;;京港澳高速河北段加寬改造路基穩(wěn)定性研究[J];內(nèi)蒙古公路與運(yùn)輸;2013年06期

相關(guān)博士學(xué)位論文 前1條

1 楊林;高等級(jí)公路加寬路堤變形性狀及穩(wěn)定性技術(shù)研究[D];吉林大學(xué);2007年

，

本文編號(hào)：2144756