【摘要】：國務(wù)院公路計劃從2013到2030年建成規(guī)模約40萬公里的國家公路網(wǎng),相對于鐵路只能在大城市中穿梭,公路對于各個地區(qū)的聯(lián)系以及人們的出行與生活顯得更為重要,進而公路的安全性與舒適性也越來越重受到關(guān)注。由于長期經(jīng)受交通荷載以及外界條件的影響路基表面極易形成不均勻沉降,給車輛的行駛與人們的安全帶來了極大的威脅,同時已形成的沉降會加重車輛與路基的動態(tài)作用,進而造成更為嚴重的破壞。以往人們研究路基沉降主要集中于確定沉降計算模型,但由于試驗方法等條件的限制使得模型具有非常大的局限性,并不能對工程的實際施工與后期運營提出實質(zhì)性的建議。2022年冬奧會的成功申請以及京津冀一體化的加快,使得張家口地區(qū)的公路建設(shè)進入了一個新的發(fā)展階段。本文以張宣公路至小村段山前沖積扇粉質(zhì)粘土為研究對象,首先研究土體基本物性指標,為后續(xù)靜動力學三軸試驗提供基本依據(jù);通過室內(nèi)靜三軸試驗探尋土體抗剪強度指標以及彈性模量與土體壓實度等物性指標的關(guān)系,并利用有限元軟件分析邊坡安全系數(shù)隨壓實度等條件的變化趨勢;通過動力學試驗分析長期循環(huán)荷載作用下土體動模量的變化過程,探尋土體物性指標如壓實度以及實驗條件如圍壓、頻率等因素對于土體累積變形的影響,達到從實驗角度研究不同因素對于路基沉降的影響并且引入敏感性分析量化不同因素的影響效果;最后利用有限元軟件建立路基模型,介紹參數(shù)的選取以及動力施加依據(jù),根據(jù)有限元軟件研究路基在不同條件下沉降值變化趨勢,通過敏感性分析方法研究不同條件對于路基沉降的影響效果,結(jié)合動力學試驗結(jié)果與有限元分析結(jié)果得出結(jié)論,針對性提出減小路基沉降的措施。
[Abstract]:The State Council highway plan has built a national highway network of about 400 thousand kilometers from 2013 to 2030. The road is more important than the railway in the big cities. The road is more important to all areas and people's travel and life, and the safety and comfort of the highway are also getting more and more attention. The influence of load and external conditions on the subgrade surface is very easy to form uneven settlement, which poses a great threat to the driving of vehicles and the safety of people. At the same time, the settlement will aggravate the dynamic action of the vehicle and the subgrade, and cause more serious damage. However, due to the restriction of the test method and other conditions, the model has great limitations, and the actual construction and operation of the project can not be put forward a substantial proposal for the successful application of the Winter Olympic Games in.2022 and the acceleration of the integration of Beijing, Tianjin and Hebei. The construction of the highway in Zhangjiakou has entered a new stage of development. The research object is the silty clay of the alluvial fan in Xuan road to the small village. First, the basic physical properties of the soil are studied, and the basic basis is provided for the follow-up static and dynamic three axis test. The relationship between the shear strength index of soil and the relationship between the elastic modulus and the soil compaction degree is explored by the static three axis test in the room, and the finite element software is used. The change trend of slope safety coefficient with compactness and other conditions is analyzed. Through dynamic test, the change process of soil dynamic modulus under long-term cyclic loading is analyzed, and the influence of soil physical properties such as compactness and experimental conditions such as confining pressure and frequency on the cumulative deformation of soil is explored to study the different factors from the experimental point of view. The influence of Yu Luji settlement and sensitivity analysis are introduced to quantify the effect of different factors. Finally, the subgrade model is established by the finite element software, the selection of parameters and the basis of dynamic application are introduced. According to the finite element software, the variation trend of subgrade settlement value under different conditions is studied, and the different conditions are studied by the sensitivity analysis method. Combined with the results of dynamic test and finite element analysis, the effect of Yu Luji settlement is concluded, and measures for reducing the settlement of subgrade are put forward.
【學位授予單位】：河北建筑工程學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U416.1

【參考文獻】

相關(guān)期刊論文 前10條

1 張向東;蘇偉林;張晉;;隧道下穿高速公路路基沉降規(guī)律[J];遼寧工程技術(shù)大學學報(自然科學版);2016年08期

2 易富;孫迪;趙琪琪;張旖旎;;隧道下穿施工引起公路路面沉降分析[J];遼寧工程技術(shù)大學學報(自然科學版);2016年07期

3 曲泰霖;徐巖;張金力;;高填方路基變形影響因素數(shù)值模擬研究[J];北方交通;2016年04期

4 程瀟;蔡銳;李秉宜;;海堤公路拓寬工程中新建路堤對老海堤沉降的影響[J];河海大學學報(自然科學版);2016年02期

5 吳亞平;潘高峰;劉路;王軍;王戫;周勇;李濤;;不同工法下高含鹽細砂區(qū)路基沉降規(guī)律研究[J];鐵道工程學報;2016年03期

6 王昌麗;朱振生;丁選明;;路堤荷載下高速公路復(fù)合地基沉降特性及預(yù)測方法研究[J];施工技術(shù);2016年05期

7 蔣瑜陽;黎浩;劉元煒;;重載道路路基下穿客運專線設(shè)計與施工方案研究[J];公路;2016年02期

8 朱玉;;交通荷載作用下草甸土路基沉降有限元數(shù)值分析[J];公路交通科技(應(yīng)用技術(shù)版);2016年01期

9 冷建;葉冠林;劉學增;朱合華;;循環(huán)荷載對上海軟土動力特性影響規(guī)律的試驗研究[J];地震工程學報;2015年04期

10 尹松;張先偉;孔令偉;Hossain Md Sayem;;海洋沉積土動剪切模量與阻尼比的試驗研究[J];巖土力學;2015年S1期

相關(guān)碩士學位論文 前2條

1 張穎;交通荷載下高速公路低路堤沉降研究[D];上海交通大學;2013年

2 董琳琳;交通荷載作用下黃河三角洲軟弱土地基沉降規(guī)律研究[D];山東大學;2010年

，

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