發(fā)布時間：2019-02-21 16:07

【摘要】：長江上游地區(qū)的涉水岸坡,由于自然因素,隨著水位的漲落,岸坡土體經(jīng)歷“浸水—風(fēng)干—浸水”的過程,岸坡土體易發(fā)生崩解,崩解后的土體散落于水中,在水下自然堆積,造成河道淤堵、阻塞航道等不利影響。壓實土體崩解的發(fā)生、發(fā)展的過程實際上是壓實土體顆粒間的力學(xué)變化過程。為了研究壓實土體崩解機理,本文依托國家自然科學(xué)基金項目(No.51479012)“周期性飽水砂泥巖混合料的劣化機理及其演化過程”開展研究工作,自主研制了室內(nèi)壓實土體崩解及水下休止角聯(lián)合試驗裝置,通過系列試驗研究了壓實土體的崩解特性及水下休止角變化規(guī)律等,主要研究內(nèi)容與成果如下:(1)基于傳統(tǒng)崩解試驗方法精度較低的問題,研制了一套壓實土體崩解試驗系統(tǒng)。該系統(tǒng)可對壓實土體崩解過程中的試樣質(zhì)量變化、體積變化、崩解速度、崩解時間和崩解完成后土體在水下堆積出的水下休止角進行有效監(jiān)測。(2)查明了壓實土體試驗中崩解時間的變化規(guī)律。利用自主研制的試驗裝置,開展了崩解試驗研究,分析了含水率、密實度、顆粒級配、顆粒種類等因素對壓實土體崩解時間的影響�；诒澜膺^程中的試驗現(xiàn)象,結(jié)合壓實土體崩解時間的變化規(guī)律,分析了影響砂巖、泥巖、砂泥巖混合顆粒土料崩解時間的主要因素。(3)查明了壓實土體試驗中崩解量的變化規(guī)律�；谧灾圃囼炏到y(tǒng),開展了不同含水率、密實度、顆粒級配、顆粒種類下的崩解試驗,獲得了各因素下的崩解指標(biāo),分析了崩解量與各因素的規(guī)律�；谠囼灲Y(jié)果,探討了影響不同顆粒種類土料崩解量的主控因素。(4)查明了壓實土體試驗完成后水下休止角的變化規(guī)律。根據(jù)試驗中崩解結(jié)束后圓盤中堆積土丘的高度,計算出崩解土體形成的水下休止角,獲得了含水率、密實度、顆粒級配、顆粒種類等因素對于水下休止角的影響,明確了水下休止角與崩解量、崩解時間之間的關(guān)系,基于試驗結(jié)果,探討了影響水下休止角的主控因素。
[Abstract]:In the upper reaches of the Yangtze River, due to natural factors and with the fluctuation of the water level, the slope soil experienced the process of "soaking, air drying and soaking", and the soil on the bank slope was prone to collapse, and the soil was scattered in the water after disintegration, and accumulated naturally under the water. Cause channel blockage, block channel and other adverse effects. The process of collapse and development of compacted soil is actually a process of mechanical change between particles of compacted soil. In order to study the collapse mechanism of compacted soil mass, this paper relies on the project of National Natural Science Foundation (No.51479012), "deterioration Mechanism and Evolution process of periodically saturated Sand and mudstone mixture". In this paper, a self-developed laboratory test device for compacted soil mass disintegration and underwater angle of repose is developed. The disintegration characteristics of compacted soil and the variation of underwater angle of repose are studied through a series of tests. The main research contents and results are as follows: (1) based on the low precision of traditional disintegration test method, a set of compacted soil disintegration test system is developed. The system can deal with the mass change, volume change and disintegration velocity of the sample in the process of compacting soil mass disintegration. The disintegration time and the underwater angle of repose accumulated under water are effectively monitored. (2) the variation law of disintegration time in compacted soil test is found out. In this paper, the disintegration test was carried out by using the self-developed experimental device, and the effects of water content, compactness, particle gradation and particle type on the disintegration time of compacted soil were analyzed. Based on the experimental phenomena in the process of disintegration, combined with the rule of the disintegration time of compacted soil, the influence of sandstone and mudstone is analyzed. The main factors of the disintegration time of sand and mudstone mixed granular soil material. (3) the rule of the quantity of disintegration in compaction soil test is found out. Based on the self-made test system, the disintegration tests under different moisture content, compactness, particle gradation and particle type were carried out, and the disintegration indexes under each factor were obtained, and the disintegration quantity and the law of each factor were analyzed. Based on the experimental results, the main controlling factors affecting the amount of soil collapse of different particle types are discussed. (4) the variation law of underwater angle of repose after the completion of compacted soil test is investigated. According to the height of the accumulated mound in the disc after disintegrating, the underwater angle of repose formed by the disintegrating soil is calculated, and the effects of water content, compactness, particle gradation and particle type on the underwater repose angle are obtained. The relationship between the angle of repose under water, the amount of disintegration and the time of disintegration is clarified. Based on the experimental results, the main controlling factors affecting the angle of repose under water are discussed.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU43

【參考文獻】

相關(guān)期刊論文 前10條

1 王俊杰;姬雪竹;張鈞堂;簡富獻;;砼-土界面抗剪特性試驗研究[J];科學(xué)技術(shù)與工程;2016年18期

2 柴肇云;張亞濤;張學(xué)堯;;泥巖耐崩解性與礦物組成相關(guān)性的試驗研究[J];煤炭學(xué)報;2015年05期

3 張巍;尚彥軍;曲永新;孫元春;林達明;王開洋;;泥質(zhì)膨脹巖崩解物粒徑分布與膨脹性關(guān)系試驗研究[J];巖土力學(xué);2013年01期

4 唐軍;余沛;魏厚振;孟慶山;;貴州玄武巖殘積土崩解特性試驗研究[J];工程地質(zhì)學(xué)報;2011年05期

5 付宏淵;陳宗浩;劉新喜;劉龍武;;室內(nèi)模擬氣候條件下炭質(zhì)頁巖崩解試驗研究[J];公路與汽運;2011年04期

6 劉曉明;熊力;張亮亮;趙明華;;Ⅰ類紅砂巖崩解性抑制措施試驗研究[J];公路交通科技;2011年03期

7 文義明;侯克鵬;周宗紅;;松散巖土體崩解試驗研究[J];有色金屬(礦山部分);2011年01期

8 曹小平;李保雄;嚴(yán)松宏;;不同測試方法對確定黃土力學(xué)參數(shù)的影響[J];水文地質(zhì)工程地質(zhì);2010年01期

9 顏波;湯連生;胡輝;王大志;林國威;;花崗巖風(fēng)化土崩崗破壞機理分析[J];水文地質(zhì)工程地質(zhì);2009年06期

10 劉曉明;趙明華;蘇永華;;軟巖崩解分形機制的數(shù)學(xué)模擬[J];巖土力學(xué);2008年08期

相關(guān)碩士學(xué)位論文 前2條

1 蘭澤鑫;花崗巖殘積土崩解試驗研究[D];華南理工大學(xué);2013年

2 鄭敏洲;殘積土的崩解特性及其土坡位移的非線性時序分析[D];福州大學(xué);2006年

，

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