本文選題：土力學(xué) + 飽和黏性土��； 參考：《鄭州大學(xué)》2017年碩士論文

【摘要】：飽和黏性土的流變固結(jié)及卸荷回彈特性對實(shí)際工程具有重要意義,本文利用改進(jìn)的滲透-固結(jié)聯(lián)合試驗(yàn)系統(tǒng)對河南信陽某地飽和黏性重塑土試樣開展了變水頭滲流、流變固結(jié)、豎向卸荷回彈等一系列試驗(yàn)研究,主要成果如下:1、首先分別推導(dǎo)出了變水頭滲透試驗(yàn)滿足Darcy滲流模型、冪指數(shù)滲流模型、Hansbo滲流模型的水頭-時(shí)間(h-t)表達(dá)式,并對三參數(shù)滲流模型建議了一種新的數(shù)值擬合方法。變水頭滲透試驗(yàn)的擬合結(jié)果表明,試驗(yàn)用土在不同孔隙比下的的滲流明顯存在著對Darcy定律的偏離,且試驗(yàn)數(shù)據(jù)更適宜用冪指數(shù)滲流模型和Hansbo滲流模型來擬合。2、一維流變固結(jié)試驗(yàn)表明,試驗(yàn)用土的流變現(xiàn)象明顯,在土體變形分析中不可忽略,且主次固結(jié)過程有明顯的耦合現(xiàn)象。單面排水一維流變固結(jié)試驗(yàn)表明,加載后不排水面孔壓不會立即上升到最大值,存在明顯的滯后現(xiàn)象,且傳統(tǒng)的Casagrande法和孔壓消散法確定主次固結(jié)分界時(shí)間明顯不一致。另外,孔隙比、超固結(jié)比、排水條件、試樣高度等條件對其流變固結(jié)特性影響明顯。3、豎向卸荷回彈試驗(yàn)表明,卸荷回彈是流變固結(jié)和卸荷回彈共同作用的過程,卸荷回彈穩(wěn)定較流變固結(jié)所需的時(shí)間更加漫長。對卸荷回彈過程進(jìn)行分析時(shí)可將其看做是流變固結(jié)的逆形式,并可以將卸荷回彈過程劃分為主回彈階段和次回彈階段。豎向卸荷回彈特性的主要影響因素包括:卸荷比R、最大固結(jié)應(yīng)力pc、卸荷速率等,卸荷比R為最主要影響因素,且存在臨界卸荷比。
[Abstract]:The rheological consolidation and unloading resilience characteristics of saturated clay are of great significance to practical engineering. In this paper, the modified osmotic and consolidation test system is used to carry out the rheological consolidation of saturated clay remolded soil samples in Xinyang, Henan Province. A series of experimental studies, such as vertical unloading springback and so on, are presented. The main results are as follows: 1. Firstly, the water head-time h-t expression of the Darcy seepage model and the power exponent percolation model are derived respectively. A new numerical fitting method is proposed for the three-parameter seepage model. The fitting results of the permeability test show that the seepage of soil with different void ratios is obviously deviated from Darcy's law. The experimental data are more suitable to fit with power exponent seepage model and Hansbo seepage model. One-dimensional rheological consolidation test shows that the rheological phenomenon of soil used in the test is obvious and can not be ignored in the analysis of soil deformation. And the main and secondary consolidation process has obvious coupling phenomenon. One-dimensional rheological consolidation tests show that the undrained face pressure does not rise to the maximum value immediately after loading, and there is obvious lag phenomenon, and the traditional Casagrande method and pore pressure dissipation method to determine the primary and secondary consolidation boundary time is obviously inconsistent. In addition, the porosity ratio, over-consolidation ratio, drainage condition and specimen height have obvious effects on the rheological consolidation characteristics. The vertical unloading springback test shows that unloading springback is the process of rheological consolidation and unloading rebound. Unloading springback stability takes longer than rheological consolidation. The unloading springback process can be regarded as the inverse form of rheological consolidation and can be divided into the main springback stage and the secondary springback stage. The main influencing factors of vertical unloading resilience include unloading ratio (R), maximum consolidation stress (PC), unloading rate and so on. Unloading ratio R is the most important factor, and the critical unloading ratio exists.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU41

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王吉利;陳盼;劉金龍;韋昌富;;軟土固結(jié)系數(shù)芻議[J];冰川凍土;2016年04期

2 章為民;顧行文;王芳;;Terzaghi固結(jié)系數(shù)的試驗(yàn)反演分析[J];巖土工程學(xué)報(bào);2016年S1期

3 余志華;桂躍;付堅(jiān);曹凈;王兆昌;;軸向卸荷條件下泥炭質(zhì)土回彈變形試驗(yàn)研究[J];水文地質(zhì)工程地質(zhì);2015年05期

4 王艷芳;蔡正銀;周治剛;關(guān)云飛;;k_0固結(jié)條件下淤泥土排水蠕變特性研究[J];巖土力學(xué);2015年08期

5 雷華陽;李賓;仇王維;盧海濱;任倩;;吹填場區(qū)軟黏土地基的次固結(jié)特性研究[J];巖土力學(xué);2015年S1期

6 譚儒蛟;焦宇杰;徐文杰;;天津?yàn)I海軟土固結(jié)-蠕變特性及微觀結(jié)構(gòu)分析[J];工程勘察;2015年05期

7 桂躍;余志華;劉海明;曹凈;王兆昌;;高原湖相泥炭土次固結(jié)特性及機(jī)理分析[J];巖土工程學(xué)報(bào);2015年08期

8 章為民;顧行文;王芳;王年香;;土的卸荷回彈試驗(yàn)及其時(shí)間過程的計(jì)算方法[J];巖土工程學(xué)報(bào);2015年06期

9 雷華陽;王學(xué)超;丁小冬;劉景錦;陳麗;張文振;;軟土主次固結(jié)劃分及影響因素探討[J];工程地質(zhì)學(xué)報(bào);2014年03期

10 劉忠玉;李東陽;;基于加載動力效應(yīng)對孔壓滯后現(xiàn)象的一個(gè)解釋[J];巖土力學(xué);2014年05期

相關(guān)博士學(xué)位論文 前3條

1 孫麗云;基于非達(dá)西滲流的飽和黏土一維固結(jié)試驗(yàn)與理論研究[D];鄭州大學(xué);2011年

2 齊添;軟土一維非線性固結(jié)理論與試驗(yàn)對比研究[D];浙江大學(xué);2008年

3 李西斌;軟土流變固結(jié)理論與試驗(yàn)研究[D];浙江大學(xué);2005年

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本文編號：1945009