本文選題：路基 + 石灰土��； 參考：《大連海事大學(xué)》2015年碩士論文

【摘要】：由于受到大連地區(qū)特有的低溫,近海氣候環(huán)境的影響,大連地區(qū)的路基存在著凍融,海水侵蝕等不利因素,使得控制路基沉降變得十分困難。石灰作為道路工程中常見的工程材料,由于對路基土具有良好的加固作用,能夠有效提高土體強(qiáng)度等,同時(shí)成本低廉,經(jīng)濟(jì)效果好,在我國得到了廣泛的應(yīng)用。本文主要針對大連金普線路基修筑工程實(shí)際存在著的土體強(qiáng)度不足,不滿足實(shí)際工程需要等問題,采用土中摻加石灰的方法,用室內(nèi)試驗(yàn)與理論分析相結(jié)合的方法研究石灰土的變化規(guī)律,確定工程最優(yōu)石灰摻量。為了解決大連路基的凍融與海水侵蝕問題,通過大連大黑石處路基土的試驗(yàn),分析對比了大連地區(qū)凍融,海水侵蝕的固化劑效應(yīng)�；谠囼�(yàn)對鄧肯-張模型進(jìn)行研究分析,采用數(shù)值模擬驗(yàn)證試驗(yàn)結(jié)果。具體內(nèi)容為：1、對大連金普線路基修筑工程路基土進(jìn)行試驗(yàn),研究了金普線路基土的基本物理特性和力學(xué)性質(zhì),獲得路基土的顆粒級配曲線、界限含水率、滲透系數(shù),確定此試驗(yàn)用土為低液限粉質(zhì)粘土。采用SLB-1型應(yīng)力應(yīng)變控制式三軸剪切滲透試驗(yàn)儀研究了金普線路基土強(qiáng)度指標(biāo)與應(yīng)力應(yīng)變曲線形式。2、對金普線路基土的石灰改良方法進(jìn)行試驗(yàn)研究,得到石灰對于試驗(yàn)用土的力學(xué)特性的影響,發(fā)現(xiàn)摻加石灰后明顯提高了土體塑限,降低塑性指數(shù)。隨著石灰改良土石灰摻量的增加,得到其強(qiáng)度、粘聚力、內(nèi)摩擦角的變化規(guī)律,摻加石灰改變了土體的應(yīng)力—應(yīng)變特性。3、針對北方地區(qū)特有的季凍區(qū)環(huán)境進(jìn)行石灰土在凍融環(huán)境下的力學(xué)試驗(yàn),得到其變化規(guī)律,試驗(yàn)結(jié)果表明,石灰作為改良劑能明顯提高土體的抗凍性。通過計(jì)算土體的彈性模量分析了金普線路基修筑工程路基土的最優(yōu)石灰摻量。考慮交通荷載作用,進(jìn)行了路基土在凍融情況下的動(dòng)三軸試驗(yàn),得到相應(yīng)的變化規(guī)律。4、通過金普線路基土浸泡試驗(yàn)?zāi)M大連的近海環(huán)境,試驗(yàn)表明,石灰改良土隨著石灰摻量的增加,水穩(wěn)性和抗海水侵蝕性都得到明顯提高。選取大連大黑石路基土進(jìn)行強(qiáng)度、凍融、海水侵蝕試驗(yàn),確定最優(yōu)固化劑配方。5、對鄧肯-張模型研究與分析,基于前期試驗(yàn)結(jié)果獲得參數(shù),采用FLAC3D軟件對金普線DK27+560路基工程段路基模型進(jìn)行三維數(shù)值模擬,并對鄧肯-張模型進(jìn)行路基土參數(shù)的敏感性分析,確定模型參數(shù)對路基位移的影響。
[Abstract]:Due to the special low temperature in Dalian area and the influence of offshore climate environment, the roadbed in Dalian area has some unfavorable factors, such as freezing and thawing, sea water erosion and so on, which makes it very difficult to control the subgrade settlement. Lime, as a common engineering material in road engineering, has been widely used in our country because of its good strengthening effect on subgrade soil, effective improvement of soil strength, low cost and good economic effect. In this paper, the method of adding lime into the soil is adopted to solve the problems of insufficient soil strength in the subgrade construction project of Dalian Jinpu Line, which does not meet the needs of the actual project. The change law of lime soil was studied by the method of laboratory test and theoretical analysis, and the optimum lime content was determined. In order to solve the problems of freeze-thaw and seawater erosion in Dalian subgrade, the effects of solidifying agent on freeze-thaw and seawater erosion in Dalian area were analyzed and compared through the test of roadbed soil at Dalian Daheishi. Based on the experiment, the Duncan-Zhang model was studied and the results were verified by numerical simulation. In this paper, the basic physical and mechanical properties of subgrade soil of Jinpu line are studied, and the gradation curve, moisture content and permeability coefficient of subgrade soil are obtained. It is determined that the test soil is silty clay with low liquid limit. The strength index and stress-strain curve of embankment soil of Jinpu Line were studied by SLB-1 stress strain control triaxial shear permeation tester, and the lime improvement method of embankment soil of Jinpu Line was studied. The influence of lime on the mechanical properties of test soil is obtained. It is found that the plastic limit of soil is obviously increased and the plasticity index is reduced after adding lime. With the increase of lime content in lime modified soil, the change of strength, cohesion and internal friction angle is obtained. The stress-strain characteristic of soil is changed by adding lime. The mechanical test of lime soil in freeze-thaw environment is carried out in the special environment of seasonal frozen area in the north of China, and the change law is obtained. The experimental results show that, Lime as a modifier can obviously improve the frost resistance of soil. Through the calculation of elastic modulus of soil, the optimum lime content of subgrade soil in embankment construction project of Jinpu Line is analyzed. Considering the action of traffic load, the dynamic triaxial test of roadbed soil under freeze-thaw condition is carried out, and the corresponding variation law .4 is obtained. Through the soaking test of embankment soil along Jinpu Line, the offshore environment of Dalian is simulated. With the increase of lime content, the water stability and seawater erosion resistance of lime modified soil are improved obviously. The strength, freeze-thaw and seawater erosion test of Dalian Daheishi subgrade soil was selected to determine the optimum curing agent formula .5. the Duncan-Zhang model was studied and analyzed, and the parameters were obtained based on the experimental results. FLAC3D software is used to simulate the subgrade model of DK27560 embankment section of Jinpu Line, and the sensitivity analysis of the soil parameters of the subgrade is carried out to determine the influence of the model parameters on the subgrade displacement.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 曹曉娟,孫明智,孟憲勇;改良土靜強(qiáng)度試驗(yàn)及結(jié)果分析[J];工程地質(zhì)學(xué)報(bào);2004年01期

2 張建華;夏岸雄;王濤;;FLAC3D數(shù)值模擬在路基施工中的應(yīng)用[J];遼寧工程技術(shù)大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年11期

3 孫希望;;石灰土填料抗剪強(qiáng)度試驗(yàn)研究[J];湖南城市學(xué)院學(xué)報(bào)(自然科學(xué)版);2011年01期

4 蘇群,徐淵博,張復(fù)實(shí);國際以及國內(nèi)土壤固化劑的研究現(xiàn)狀和前景展望[J];黑龍江工程學(xué)院學(xué)報(bào);2005年03期

5 柴壽喜;王沛;魏麗;李芳;韓文峰;;含鹽量對濱海鹽漬土物理及水理性質(zhì)的影響[J];煤田地質(zhì)與勘探;2006年06期

6 郭紹影;;鐵路路基填料改良前后物理、化學(xué)性質(zhì)變化分析[J];鐵道建筑技術(shù);2006年05期

7 蘇群;王國峰;張復(fù)實(shí);徐淵博;;寒區(qū)路基土PAMCATS固化劑的固化機(jī)理[J];長安大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年03期

8 馮衛(wèi)星,常紹東,胡萬毅;北京細(xì)砂土鄧肯-張模型參數(shù)試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);1999年03期

9 雷勝友,惠會(huì)清;膨脹土及其改良土靜動(dòng)力特性對比分析[J];巖石力學(xué)與工程學(xué)報(bào);2004年17期

10 龔曉南;;軟黏土地基土體抗剪強(qiáng)度若干問題[J];巖土工程學(xué)報(bào);2011年10期

相關(guān)博士學(xué)位論文 前1條

1 韓春鵬;石灰處治土路基凍融作用特性研究[D];東北林業(yè)大學(xué);2011年

相關(guān)碩士學(xué)位論文 前1條

1 陸章發(fā);CHF土壤固化劑在道路工程中的應(yīng)用技術(shù)研究[D];廣西大學(xué);2013年

，

本文編號：2029525