本文選題：振動排水 + 固結(jié)��； 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：軟土在世界各地分布廣泛。因其成因不同,不同沉積相的軟土具有不同的物理力學(xué)性質(zhì)。另外,不同地區(qū)的軟土其結(jié)構(gòu)性亦有差別。本文在動力排水固結(jié)技術(shù)的基礎(chǔ)上,采用周期性振動荷載代替沖擊荷載,提出振動排水固結(jié)法加固海相和漫灘相軟土,并同靜荷載下的排水效應(yīng)對比。通過江蘇連云港海相和鎮(zhèn)江漫灘相軟土的室內(nèi)振動排水固結(jié)試驗,分析不同沉積相軟土的排水固結(jié)特性;設(shè)計漫灘相軟土振動排水固結(jié)優(yōu)化試驗方案,探討其在低頻振動作用下提高固結(jié)效果的合適參數(shù)組合。通過對不同圍壓的漫灘相軟土進行振動排水固結(jié)試驗,分析該沉積相軟土的動力響應(yīng)。研究的主要內(nèi)容包括:(1)海相和漫灘相軟土的固結(jié)特性分析。在海相和漫灘相軟土基本物理力學(xué)指標分析的基礎(chǔ)上,為探究振動荷載作用下兩相軟土的固結(jié)特性,利用自主設(shè)計的動態(tài)固結(jié)滲透儀對海相和漫灘相軟土進行振動排水固結(jié)試驗。在固結(jié)初期,對海相和漫灘相軟土先施加靜載后施加動載與同步施加靜動荷載來探究不同加載方式下排水響應(yīng)。分析了擾動程度對兩相軟土和含水率對漫灘相重塑土的振動排水固結(jié)效應(yīng)的影響;對兩相軟土分別施加矩形波、三角波和正弦波來分析波形對其固結(jié)效率的影響;探究海相和漫灘相軟土軸向累積應(yīng)變和排水體積應(yīng)變隨時間的變化規(guī)律。結(jié)果表明:初期先施加靜載后施加動載的加載方式的排水固結(jié)效果良好;擾動程度越小的軟土的固結(jié)效率越高;隨著含水量增大,振動排水固結(jié)效率顯著提高;矩形波較其他波形振動荷載能夠產(chǎn)生更大的排水體積應(yīng)變和軸向累積應(yīng)變;在圍壓、頻率和荷載相同的條件下,當(dāng)排水體積應(yīng)變穩(wěn)定時,漫灘相軟土較海相軟土固結(jié)時間短。(2)漫灘相軟土振動排水固結(jié)效果分析。對漫灘相軟土進行振動排水固結(jié)試驗,通過調(diào)整靜載初始值、分級靜荷載持續(xù)時間以及振動荷載起始時間來探究排水固結(jié)效果的影響,根據(jù)固結(jié)過程中軸向累積應(yīng)變和排水體積應(yīng)變,確定振動排水固結(jié)法合理參數(shù)組合。結(jié)果表明:靜載初始值、分級加載持續(xù)時間、振動荷載起始時間對其軸向累積應(yīng)變和排水體積應(yīng)變產(chǎn)生顯著影響;在軟土固結(jié)過程中,頻率的變化對軟土固結(jié)效果影響程度不同。(3)不同圍壓下漫灘相軟土的動力響應(yīng)分析。在不同圍壓下,使其排水固結(jié)24小時,然后對其先施加靜載,后施加不同頻率的振動荷載,分析其固結(jié)產(chǎn)生的排水體積應(yīng)變、軸向累積應(yīng)變和排水體積應(yīng)變速率,探究其動力響應(yīng)。結(jié)果表明:圍壓和頻率對軟土固結(jié)具有重要的影響。
[Abstract]:Soft soil is widely distributed all over the world. Because of its different origin, the soft soil of different sedimentary facies has different physical and mechanical properties. In addition, there are differences in the structure of soft soil in different regions. On the basis of dynamic drainage consolidation technique, the cyclic vibration load is used to replace the impact load, and the vibration drainage consolidation method is proposed to strengthen the marine and floodplain soft soil, which is compared with the drainage effect under static load. Through indoor vibration drainage consolidation test of marine and Zhenjiang floodplain soft soil in Lianyungang, Jiangsu Province, the characteristics of drainage consolidation of soft soil with different sedimentary facies are analyzed, and the optimum test scheme of vibration drainage consolidation of soft soil in floodplain is designed. The suitable combination of parameters to improve the consolidation effect under low frequency vibration is discussed. The dynamic response of the sedimentary soft soil was analyzed by vibration drainage consolidation test on the soft soil with different confining pressures. The main contents of the study include the analysis of the consolidation characteristics of marine and floodplain soft soil. Based on the analysis of basic physical and mechanical indexes of marine and floodplain soft soil, the consolidation characteristics of two-phase soft soil under vibration load are investigated. The vibration drainage consolidation test of marine and floodplain soft soil was carried out by using the self-designed dynamic consolidation osmometer. In the early stage of consolidation, the response of draining under different loading modes was investigated by applying static load first and then dynamic load and synchronously applying static load on the marine and floodplain soft soil. The influence of disturbance degree on the vibration drainage consolidation effect of two-phase soft soil and water content is analyzed, the rectangular wave, triangle wave and sine wave are applied to the two-phase soft soil to analyze the effect of waveform on the consolidation efficiency. The variation law of axial cumulative strain and drainage volume strain of marine and floodplain soft soil with time are investigated. The results show that the consolidation efficiency of the soft soil with less disturbance is higher, and the consolidation efficiency of vibration drainage increases with the increase of water content, and the consolidation effect of the loading method with static load first and then dynamic load is good, and the consolidation efficiency of soft soil is higher with the increase of water content. The rectangular wave can produce larger drainage volume strain and axial cumulative strain than other wave vibration load. Under the condition of the same confining pressure, frequency and load, the drainage volume strain is stable when the drainage volume strain is stable. The consolidation time of soft soil in floodplain is shorter than that in marine soft soil. Vibration drainage consolidation test was carried out on the soft soil of floodplain. By adjusting the initial value of static load, the duration of graded static load and the initial time of vibration load, the effect of drainage consolidation effect was investigated. According to the axial cumulative strain and the drainage volume strain during the consolidation process, the reasonable parameter combination of the vibration drainage consolidation method is determined. The results show that the initial value of static load, the duration of step loading and the onset time of vibration load have significant effects on the axial cumulative strain and drainage volume strain, and during the consolidation of soft soil, The dynamic response of the soft soil under different confining pressures is analyzed by the influence of frequency change on the consolidation effect of soft soil. Under different confining pressures, the drainage is consolidated for 24 hours, then static load is applied to it, and then vibration load is applied at different frequencies. The volume strain of drainage, axial cumulative strain and strain rate of drainage volume produced by consolidation are analyzed. Explore its dynamic response. The results show that the confining pressure and frequency have an important effect on the consolidation of soft soil.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU472

【參考文獻】

相關(guān)期刊論文 前10條

1 苗永紅;李瑞兵;陳邦;;軟土的振動排水固結(jié)特性試驗研究[J];巖土工程學(xué)報;2016年07期

2 宋苗苗;王超;洪振舜;丁建文;;鹽分浸析對我國海相沉積土物理性質(zhì)的影響[J];東南大學(xué)學(xué)報(自然科學(xué)版);2015年03期

3 鄧永鋒;岳喜兵;張彤煒;劉松玉;楊忠超;;連云港海相軟土在孔隙水鹽分溶脫環(huán)境下的固結(jié)特性[J];巖土工程學(xué)報;2015年01期

4 蘇濤;董平洋;胡照廣;;松花江河漫灘相軟土的巖土工程性質(zhì)試驗研究[J];森林工程;2014年04期

5 曹勇;孔令偉;楊愛武;;海積結(jié)構(gòu)性軟土動力性狀的循環(huán)荷載波形效應(yīng)與剛度軟化特征[J];巖土工程學(xué)報;2013年03期

6 鄭剛;霍海峰;雷華陽;張立明;;振動頻率對飽和黏土動力特性的影響[J];天津大學(xué)學(xué)報;2013年01期

7 張季超;梁鐵錨;楊永康;;動力排水固結(jié)法處理軟土地基的關(guān)鍵技術(shù)研究[J];施工技術(shù);2012年24期

8 李惠;陳金光;喬衛(wèi)國;;深圳海積軟土的三軸不排水蠕變特性與經(jīng)驗型模型[J];建筑科學(xué);2011年09期

9 尹振宇;;天然軟黏土的彈黏塑性本構(gòu)模型:進展及發(fā)展[J];巖土工程學(xué)報;2011年09期

10 許勇;周翠英;張季超;;動力排水固結(jié)法處理填海地基的研究應(yīng)用[J];工程力學(xué);2010年S2期

，

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