本文選題：振動(dòng)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(dòng)力排水固結(jié)技術(shù)的基礎(chǔ)上,采用周期性振動(dòng)荷載代替沖擊荷載,提出振動(dòng)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(duì)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(dòng)排水固結(jié)試驗(yàn),分析不同沉積相軟土的排水固結(jié)特性;設(shè)計(jì)漫灘相軟土振動(dòng)排水固結(jié)優(yōu)化試驗(yàn)方案,探討其在低頻振動(dòng)作用下提高固結(jié)效果的合適參數(shù)組合。通過對(duì)不同圍壓的漫灘相軟土進(jìn)行振動(dòng)排水固結(jié)試驗(yàn),分析該沉積相軟土的動(dòng)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(biāo)分析的基礎(chǔ)上,為探究振動(dòng)荷載作用下兩相軟土的固結(jié)特性,利用自主設(shè)計(jì)的動(dòng)態(tài)固結(jié)滲透儀對(duì)海相和漫灘相軟土進(jìn)行振動(dòng)排水固結(jié)試驗(yàn)。在固結(jié)初期,對(duì)海相和漫灘相軟土先施加靜載后施加動(dòng)載與同步施加靜動(dòng)荷載來探究不同加載方式下排水響應(yīng)。分析了擾動(dòng)程度對(duì)兩相軟土和含水率對(duì)漫灘相重塑土的振動(dòng)排水固結(jié)效應(yīng)的影響;對(duì)兩相軟土分別施加矩形波、三角波和正弦波來分析波形對(duì)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(shí)間的變化規(guī)律。結(jié)果表明:初期先施加靜載后施加動(dòng)載的加載方式的排水固結(jié)效果良好;擾動(dòng)程度越小的軟土的固結(jié)效率越高;隨著含水量增大,振動(dòng)排水固結(jié)效率顯著提高;矩形波較其他波形振動(dòng)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(shí),漫灘相軟土較海相軟土固結(jié)時(shí)間短。(2)漫灘相軟土振動(dòng)排水固結(jié)效果分析。對(duì)漫灘相軟土進(jìn)行振動(dòng)排水固結(jié)試驗(yàn),通過調(diào)整靜載初始值、分級(jí)靜荷載持續(xù)時(shí)間以及振動(dòng)荷載起始時(shí)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(dòng)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(jí)加載持續(xù)時(shí)間、振動(dòng)荷載起始時(shí)間對(duì)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(duì)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(dòng)力響應(yīng)分析。在不同圍壓下,使其排水固結(jié)24小時(shí),然后對(duì)其先施加靜載,后施加不同頻率的振動(dòng)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(dòng)力響應(yīng)。結(jié)果表明:圍壓和頻率對(duì)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(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU472

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