本文關(guān)鍵詞： 道路工程 軟土 沉降 地基處理 水泥攪拌樁　出處：《長安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：在高速公路路基施工中，公路經(jīng)常會穿越一些工程地質(zhì)條件不良的軟土地帶，軟土地基會對公路路基穩(wěn)定性產(chǎn)生嚴(yán)重的危害，同時，其不均勻沉降也是導(dǎo)致路面早期破壞的主要原因之一。因此，軟土地基處理方法和沉降觀測的研究對公路建設(shè)十分重要。面對這些軟土地基處理的需要，復(fù)合地基處理方法得到了廣泛應(yīng)用，其中，水泥攪拌樁法以施工速度快，施工過程中無振動、無噪音、無地面隆起，對周圍環(huán)境和建筑物不產(chǎn)生有害影響等優(yōu)點而日益受到關(guān)注。 哈爾濱市松花江漫灘區(qū)軟土由松花江曲流作用垂向沉積形成，屬河漫灘相軟土，其厚度分布不均勻，主要成分為淤泥質(zhì)土、粉質(zhì)粘土和粉砂土，具有顯著的區(qū)域特點。論文依托哈爾濱市松北區(qū)“哈爾濱科技創(chuàng)新城193規(guī)劃路建設(shè)項目”，試驗路段位于K0+380~K0+620路段，屬于松花江河漫灘區(qū)，原始地貌為濕地，后采取“吹砂筑島”施工工藝，利用絞吸式挖泥船獲取的江沙從堤岸在道路工程位置筑起用于建設(shè)的“大島嶼”，在道路地基土中有2~6m厚的軟土地基，成分為淤泥質(zhì)土、粉砂和粉質(zhì)粘土，工程地質(zhì)條件較差，此路段軟土路基處理選用水泥攪拌樁復(fù)合地基處理法。 論文首先通過現(xiàn)場地質(zhì)勘查得出研究區(qū)軟土層的位置和厚度，并對各個深度的土樣進(jìn)行了室內(nèi)物理性質(zhì)試驗和直接剪切試驗，，得到各土層的物理性質(zhì)參數(shù)以及粘聚力和內(nèi)摩擦角，以了解試驗路段地基土的抗剪強度指標(biāo)。然后對研究區(qū)試驗路段所采用的水泥攪拌樁法加固道路軟土地基的設(shè)計、施工工藝等進(jìn)行了探討，分析了質(zhì)量控制的關(guān)鍵問題，重點研究了施工過程中質(zhì)量控制、檢測檢驗以及工后沉降控制。最后，在研究區(qū)的典型路段K0+400和K0+500斷面均布置了沉降監(jiān)測點，對道路的左路肩、中央位置和右路肩等位置的沉降數(shù)據(jù)進(jìn)行定期不間斷的監(jiān)測，通過一年多的實測數(shù)據(jù)，監(jiān)測出水泥攪拌樁法處理后的道路最終沉降量變化，研究水泥攪拌樁處理后的試驗路段地基穩(wěn)定性及沉降特性，分析水泥攪拌樁處理松花江河漫灘相軟土地基的效果，并分析影響沉降的主要原因。研究表明：監(jiān)測所得水泥攪拌樁的實際沉降小于理論的計算值，說明試驗段路基處理效果良好，可以滿足工后沉降要求，同時也表明研究路段的水泥攪拌樁樁設(shè)計方案合理。由此可鑒水泥攪拌樁通過加固道路的地基承載力，減少了道路地基工后沉降。
[Abstract]:In the highway roadbed construction, the highway often passes through some engineering geological condition bad soft soil belt, the soft soil foundation will produce the serious harm to the highway subgrade stability, at the same time. The uneven settlement is also one of the main reasons leading to the early destruction of pavement. Therefore, the research of soft soil foundation treatment and settlement observation is very important for highway construction. In the face of the need of these soft foundation treatment. The composite foundation treatment method has been widely used, among which, the cement mixing pile method has a fast construction speed, no vibration, no noise, no ground uplift during the construction process. More and more attention has been paid to the advantages of no harmful effects on the surrounding environment and buildings. The soft soil in Songhua River floodplain area of Harbin City is formed by the vertical deposition of Songhua River meandering. It belongs to the soft soil of the floodplain facies and its thickness distribution is uneven. The main components are silt clay and silty sand. It has remarkable regional characteristics. The paper relies on Harbin Songbei District "Harbin Science and Technology Innovation City 193 Planning Road Construction Project", the experimental road section is located at K0380 and K0620. It belongs to Songhua River floodplain area, the original landform is wetland, after adopting the construction craft of "blowing sand to build island", the "big island" for construction is built from the embankment in the position of road engineering by using the sand obtained by the suction dredger. There are two or six meters thick soft soil foundation in the road foundation, which is composed of silty soil, silty sand and silty clay, and the engineering geological conditions are poor. The cement mixing pile composite foundation method is used to treat the soft soil subgrade in this section. Firstly, the location and thickness of soft soil layer in the study area are obtained through the field geological survey, and the indoor physical property test and direct shear test are carried out for each depth of soil sample. The physical properties, cohesion and internal friction angle of each soil layer are obtained. In order to understand the shear strength index of the foundation soil in the test section, the design and construction technology of the cement mixing pile method used in the test section to strengthen the soft soil foundation of the road are discussed. The key problems of quality control are analyzed, and the quality control, inspection and settlement control after construction are studied. Settlement monitoring points were arranged at sections K0400 and K0500 of typical sections in the study area. The settlement data of the left shoulder, center position and right shoulder of the road were monitored on a regular and uninterrupted basis. Based on the measured data of more than one year, the change of the final settlement of the road after the treatment of cement mixing pile is monitored, and the stability and settlement characteristics of the test section after the treatment of cement mixing pile are studied. This paper analyzes the effect of cement mixing pile on treating soft soil foundation of Songhua River floodplain, and analyzes the main reasons of influencing settlement. The research shows that the actual settlement of cement mixing pile obtained by monitoring is less than the calculated value of theory. The results show that the test section of the subgrade treatment effect is good, can meet the requirements of post-construction settlement, but also shows that the study section of cement mixing pile design scheme is reasonable, which can be used to identify the cement mixing pile through the reinforcement of the foundation bearing capacity of the road. It reduces the settlement of road foundation after construction.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 吳青柏,朱元林,施斌;工程活動下的凍土環(huán)境研究[J];冰川凍土;2001年02期

2 張皖湘;;水泥攪拌樁復(fù)合地基在垂直荷載作用下樁與土的受力特性分析[J];工程與建設(shè);2010年04期

3 鄭剛,姜忻良,嚴(yán)宗達(dá);水泥攪拌樁有限元-無窮元耦合分析[J];天津大學(xué)學(xué)報;2000年06期

4 馮銘璋;沿海土層土性指標(biāo)的統(tǒng)計分析[J];巖土工程學(xué)報;1989年02期

5 徐超;葉觀寶;姜竹生;周啟兆;;基于現(xiàn)場監(jiān)測的軟土地基聯(lián)合處理機(jī)理研究[J];巖土工程學(xué)報;2006年07期

6 劉松玉;韓文君;章定文;杜廣印;;劈裂真空法加固軟土地基試驗研究[J];巖土工程學(xué)報;2012年04期

7 胡修文,唐輝明,劉佑榮;傳遞系數(shù)法的模型試驗驗證[J];巖土力學(xué);2005年01期

8 董亮;葉陽升;蔡德鉤;吳波;楊年華;;高速鐵路軟土地基處理方法對比試驗[J];巖土力學(xué);2006年10期

9 劉華麗;朱大勇;劉德富;錢七虎;;邊坡安全系數(shù)的多解性討論[J];巖土力學(xué);2007年08期

10 楊濤;周德培;馬惠民;張忠平;;滑坡穩(wěn)定性分析的點安全系數(shù)法[J];巖土力學(xué);2010年03期

本文編號：1445851