本文選題：軟土　切入點(diǎn)：微孔隙特征　出處：《華南理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：非線性固結(jié)壓縮是軟土固有的復(fù)雜特性之一。歷經(jīng)六十多年的發(fā)展,非線性固結(jié)理論已經(jīng)取得比較豐富的成果,但大多數(shù)都是從宏觀角度研究軟土滲透固結(jié)性狀,關(guān)于軟土非線性固結(jié)模型與固結(jié)系數(shù)模型的選定及其參數(shù)的確定等問(wèn)題仍然是困擾固結(jié)理論在軟土工程實(shí)踐應(yīng)用和發(fā)展的難題。在充分認(rèn)識(shí)軟土微觀變化規(guī)律對(duì)固結(jié)特性影響的基礎(chǔ)上,建立能反映軟土實(shí)際受力固結(jié)變形的固結(jié)模型,進(jìn)一步實(shí)現(xiàn)數(shù)值分析并應(yīng)用于巖土工程實(shí)踐中是一項(xiàng)重要而緊迫的工作。本文通過(guò)室內(nèi)試樣和理論分析,對(duì)軟土固結(jié)模型及計(jì)算理論進(jìn)一步開展了較為深入的研究。主要內(nèi)容包括:(1)總結(jié)和分析了當(dāng)前國(guó)內(nèi)外關(guān)于軟土微觀結(jié)構(gòu)特征及工程特性研究成果,介紹國(guó)內(nèi)外對(duì)軟土固結(jié)模型的探索研究和固結(jié)模型的適用范圍。(2)以珠江三角洲重塑軟土為研究對(duì)象,進(jìn)行固結(jié)試驗(yàn)及滲透試驗(yàn)�；谠囼�(yàn)結(jié)果,總結(jié)出適用于珠江三角洲正常固結(jié)軟土的非線性固結(jié)模型及固結(jié)系數(shù)模型。軟土固結(jié)模型固結(jié)系數(shù)由天然部分和固結(jié)變化部分組成,后者可表達(dá)為與固結(jié)壓力的關(guān)系。(3)基于e-lnp模型和大應(yīng)變條件,聯(lián)立土體單元平衡方程、幾何變形方程及滲流連續(xù)方程,建立了適用于軟土的一維非線性固結(jié)模型及固結(jié)系數(shù)計(jì)算模型,并將一維固結(jié)方程推廣到二維、三維情況下的固結(jié)模型�；谲浲廖⒖紫短卣髯兓�(guī)律的固結(jié)模型滿足變形協(xié)調(diào)條件。(4)利用有限差法隱式差分格式解一維固結(jié)方程,利用有限差分法交替方向隱式格式(ADI格式)求解二維固結(jié)方程、軸對(duì)稱固結(jié)方程及三維固結(jié)方程,用Matlab軟件編制差分法求解程序,差分程序得到的數(shù)值解與Terzaghi一維固結(jié)精確解及Terzaghi-Rendulic固結(jié)方程精確解結(jié)果良好吻合,驗(yàn)證差分格式求解的有效性及準(zhǔn)確性。(5)對(duì)一維固結(jié)情況、二維固結(jié)情況、雙層地基及砂井問(wèn)題進(jìn)行理論計(jì)算。數(shù)值計(jì)算結(jié)果表明:基于軟土微孔隙特征變化規(guī)律的固結(jié)模型超靜孔隙水壓力消散速度明顯慢于固結(jié)系數(shù)為常數(shù)的Terzaghi固結(jié)模型、Terzaghi-Rendulic固結(jié)方程及Biot固結(jié)模型,更能正確反映一維或多維情況下單層及多層地基孔隙水消散過(guò)程。與軟土固結(jié)試驗(yàn)數(shù)值相比較,WG固結(jié)模型理論更加符合真實(shí)情況。
[Abstract]:Nonlinear consolidation and compression is one of the inherent complex characteristics of soft soil. After more than 60 years of development, the theory of nonlinear consolidation has made a lot of achievements, but most of them are from the macro perspective to study the properties of soft soil osmotic consolidation. The selection of nonlinear consolidation model and coefficient model of soft soil and the determination of its parameters are still difficult problems for the application and development of consolidation theory in soft soil engineering. Based on the effect of consolidation characteristics, It is an important and urgent work to establish a consolidation model which can reflect the actual stress and deformation of soft soil, and to further realize numerical analysis and its application in geotechnical engineering. The consolidation model and calculation theory of soft soil are further studied. The main contents include: 1) summarize and analyze the research results of microstructure and engineering characteristics of soft soil at home and abroad. This paper introduces the exploration and research of soft soil consolidation model at home and abroad and the applicable scope of consolidation model. (2) taking the remolded soft soil in the Pearl River Delta as the research object, the consolidation test and permeation test are carried out. The nonlinear consolidation model and the consolidation coefficient model for the normal consolidation soft soil in the Pearl River Delta are summarized. The consolidation coefficient of the soft soil consolidation model consists of the natural part and the consolidation variation part. The latter can be expressed as the relationship with consolidation pressure. (3) based on e-lnp model and large strain condition, the simultaneous soil element equilibrium equation, geometric deformation equation and seepage continuity equation are established. The one-dimensional nonlinear consolidation model and the calculation model of consolidation coefficient for soft soil are established, and the one-dimensional consolidation equation is extended to two-dimensional consolidation equation. The consolidation model based on the variation of micropore characteristics of soft soil satisfies the deformation coordination condition. (4) the finite difference implicit difference scheme is used to solve the one-dimensional consolidation equation. The finite difference method is used to solve two dimensional consolidation equation, axisymmetric consolidation equation and three dimensional consolidation equation by alternating direction implicit scheme (ADI). The program of difference method is compiled with Matlab software. The numerical results obtained by the difference program are in good agreement with the results of the Terzaghi one-dimensional consolidation exact solution and the Terzaghi-Rendulic consolidation equation, which verify the validity and accuracy of the difference scheme for one-dimensional consolidation and two-dimensional consolidation. The numerical results show that the consolidation model based on the rule of variation of micropore characteristics in soft soil is obviously slower than the Terzaghi consolidation model with constant consolidation coefficient in excess pore pressure dissipation rate. Terzaghi-Rendulic consolidation equation and Biot consolidation model, Compared with the consolidation test of soft soil, the WG consolidation model theory is more suitable for the real situation.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU43

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 葉正強(qiáng),李愛(ài)群,楊國(guó)華,黃鎮(zhèn),張森安;粘性土的滲透規(guī)律性研究[J];東南大學(xué)學(xué)報(bào);1999年05期

2 劉松玉,張繼文;土中孔隙分布的分形特征研究[J];東南大學(xué)學(xué)報(bào);1997年03期

3 張禮中;胡瑞林;李向全;張永波;;土體微觀結(jié)構(gòu)定量分析系統(tǒng)及應(yīng)用[J];地質(zhì)科技情報(bào);2008年01期

4 鐘映春,譚湘強(qiáng),楊宜民;微流體力學(xué)幾個(gè)問(wèn)題的探討[J];廣東工業(yè)大學(xué)學(xué)報(bào);2001年03期

5 施建勇,楊立昂,趙維炳,劉永新;考慮土體非線性特性的一維固結(jié)理論研究[J];河海大學(xué)學(xué)報(bào)(自然科學(xué)版);2001年01期

6 過(guò)增元;國(guó)際傳熱研究前沿──微細(xì)尺度傳熱[J];力學(xué)進(jìn)展;2000年01期

7 吳承偉;馬國(guó)軍;周平;;流體流動(dòng)的邊界滑移問(wèn)題研究進(jìn)展[J];力學(xué)進(jìn)展;2008年03期

8 陳琦慧;孫樹林;;利用修正太沙基理論進(jìn)行土體非線性固結(jié)沉降計(jì)算研究[J];上海地質(zhì);2005年04期

9 魏汝龍;;整理壓縮試驗(yàn)資料的一種新方法[J];水利水運(yùn)科學(xué)研究;1980年03期

10 彭立才;蔣明鏡;朱合華;林奕禧;黃良機(jī);;珠海地區(qū)軟土微觀結(jié)構(gòu)類型及定量分析研究[J];水利學(xué)報(bào);2007年S1期

相關(guān)博士學(xué)位論文 前3條

1 陶高梁;巖土多孔介質(zhì)孔隙結(jié)構(gòu)的分形研究及其應(yīng)用[D];武漢理工大學(xué);2010年

2 莊迎春;軟土非單調(diào)壓縮固結(jié)試驗(yàn)與理論研究[D];浙江大學(xué);2005年

3 周暉;珠江三角洲軟土顯微結(jié)構(gòu)與滲流固結(jié)機(jī)理研究[D];華南理工大學(xué);2013年

相關(guān)碩士學(xué)位論文 前2條

1 江雯;考慮軟粘土滲透性和壓縮性變化的一維固結(jié)理論研究[D];浙江大學(xué);2003年

2 馬馳;考慮固結(jié)系數(shù)為非常數(shù)時(shí)固結(jié)方程差分解[D];鐵道部科學(xué)研究院;2006年

，

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