本文選題：基坑坡體　切入點(diǎn)：位移矢量角　出處：《青島理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：論文的研究內(nèi)容基于國家自然科學(xué)基金與山東省自然科學(xué)杰出青年基金項(xiàng)目,開展了對基坑坡體安全性問題數(shù)值計(jì)算的研究和分析,根據(jù)土體的變形特性,采用非線性有限元方法,通過對數(shù)值模擬的結(jié)果分析,探討基坑坡體監(jiān)測位移矢量角與基坑安全性的關(guān)系。具體內(nèi)容如下： 1、從動(dòng)力學(xué)角度分析了在基坑坡體演化破壞過程中僅依賴位移或位移速率這一單一信息的缺陷性,并闡述位移矢量角的研究意義及其動(dòng)力學(xué)特征,介紹了基坑坡體表面位移矢量角的基本構(gòu)成及演化特征。 2、提出三條基坑坡體穩(wěn)定性判據(jù)：(1)在基坑坡底位移矢量角將突然變�。辉诨悠马斘灰剖噶拷菍⑼蝗蛔兇�,在中間部分位移矢量角隨時(shí)間將逐漸增大；(2)根據(jù)數(shù)理統(tǒng)計(jì)基本原理,對基坑坡體位移矢量角的異常變化是否為突變可采用均方差做判據(jù),即位移矢量角變化值是否在其均值加均方差的倍數(shù)范圍內(nèi)波動(dòng)作為邊坡位移矢量角異常變化判據(jù)；(3)對于基坑坡底位移矢量角減小突變的最小值應(yīng)與基坑坡體的傾角進(jìn)行對比,如果大于坡體傾角,說明基坑土體下滑移動(dòng)在其抗剪強(qiáng)度范圍內(nèi),無剪出破壞的可能性,如果小于坡體傾角,說明基坑土體有向基坑以外運(yùn)動(dòng),有剪出坡體發(fā)生失穩(wěn)的趨勢。 3、根據(jù)土釘支護(hù)的作用機(jī)理,將土釘與基坑坡體的土體組合起到骨架作用,從而提高土體的整體剛度和結(jié)構(gòu)整體性,且指出土釘支護(hù)屬于被動(dòng)制約機(jī)制。 4、考慮基坑坡體在無支護(hù)和土釘支護(hù)條件兩種情況時(shí)位移矢量角演化過程的變化規(guī)律,提出并驗(yàn)證位移矢量角在基坑坡體穩(wěn)定性中的判據(jù)。 5、根據(jù)位移矢量角在簡單土質(zhì)條件下對基坑邊坡穩(wěn)定性的判據(jù),進(jìn)而探討極端降雨產(chǎn)生滲流對土釘支護(hù)條件下基坑坡體安全性的影響,并將土釘支護(hù)與無支護(hù)條件下基坑坡體穩(wěn)定性的預(yù)測預(yù)報(bào)及防治評價(jià)用做判據(jù)。
[Abstract]:Based on the project of National Natural Science Foundation of China and Shandong Province Natural Science Outstanding Youth Foundation, this paper has carried out the research and analysis of the numerical calculation of the slope safety of foundation pit, according to the deformation characteristics of soil. By using the nonlinear finite element method, the relationship between the displacement vector angle of slope monitoring and the safety of foundation pit is discussed by analyzing the results of numerical simulation. 1. From the dynamic point of view, the defect of the single information of displacement or displacement rate in the evolution and failure process of foundation pit slope is analyzed, and the significance of the study of displacement vector angle and its dynamic characteristics are expounded. The basic structure and evolution characteristics of displacement vector angle on slope surface of foundation pit are introduced. 2. Three slope stability criteria: 1) the displacement vector angle at the bottom of the foundation pit will suddenly become smaller, and the displacement vector angle at the top of the foundation pit will suddenly become larger, and the displacement vector angle in the middle part will gradually increase with time.) according to the basic principle of mathematical statistics, If the abnormal change of displacement vector angle of foundation pit slope is abrupt, the mean square deviation can be used as criterion. That is, whether the variation value of displacement vector angle fluctuates in the multiple range of mean value plus mean variance as the criterion of abnormal variation of slope displacement vector angle, the minimum value of reducing abrupt change of displacement vector angle at the bottom of foundation pit should be compared with the slope slope angle of foundation pit. If the slope angle is greater than the slope slope angle, it shows that the sliding movement of the foundation pit soil is within the range of its shear strength and there is no possibility of shearing failure. If the slope slope angle is smaller than the slope body inclination angle, it shows that the foundation pit soil is moving outside the foundation pit and has the tendency of instability of the shear out slope body. 3. According to the mechanism of soil nailing support, the combination of soil nailing and foundation pit slope body plays a skeleton role, thus improving the overall stiffness and structural integrity of soil, and pointing out that soil nailing support belongs to passive restraint mechanism. 4. Considering the evolution law of displacement vector angle in the condition of no support and soil nailing support, the criterion of displacement vector angle in the stability of foundation pit slope is proposed and verified. 5. According to the criterion of displacement vector angle to the slope stability of foundation pit under simple soil condition, the influence of percolation caused by extreme rainfall on the safety of foundation pit slope under soil nailing support is discussed. The prediction, prediction and prevention evaluation of slope stability of foundation pit under the condition of soil nailing support and no support are used as criteria.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU470

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 潘旦光;吳順川;朱來磊;王光紅;;土層性質(zhì)冪函數(shù)變化下的一維固結(jié)[J];北京科技大學(xué)學(xué)報(bào);2008年10期

2 高文華,楊林德;軟土深基坑圍護(hù)結(jié)構(gòu)變形的三維有限元分析[J];工程力學(xué);2000年02期

3 潘鵬飛,梁]"祥,李軍才;邊坡治理數(shù)值模擬的研究[J];礦業(yè)工程;2005年04期

4 孫楠思;李義迅;張敏;;“2006.8”特大暴雨個(gè)例分析及對青島東北部沿岸地區(qū)的影響[J];海岸工程;2008年03期

5 高俊合,趙維炳,李興文;深開挖有限元分析中釋放荷載模擬——三種常用方法比較及改進(jìn)的Mana法[J];河海大學(xué)學(xué)報(bào)(自然科學(xué)版);1999年01期

6 李慶寶;黃容;孫桂平;張?zhí)K平;張?jiān)谙?;青島地區(qū)暴雨時(shí)空分布統(tǒng)計(jì)分析[J];海洋通報(bào);2008年04期

7 郭盛蓉;青島地區(qū)夏季降水特征分析[J];海洋湖沼通報(bào);2005年01期

8 韓有松;孟廣蘭;;青島沿海地區(qū)20,000年以來的古地理環(huán)境演變[J];海洋與湖沼;1986年03期

9 王厚廣,江敦雙,孫正,徐曉亮;青島2000年汛期暴雨的特征[J];海洋預(yù)報(bào);2001年04期

10 王建仁,張福林;基坑穩(wěn)定的人工神經(jīng)網(wǎng)絡(luò)預(yù)測[J];建筑技術(shù)開發(fā);2001年02期

相關(guān)博士學(xué)位論文 前1條

1 侯龍;非飽和土孔隙水作用機(jī)理及其在邊坡穩(wěn)定分析中的應(yīng)用研究[D];重慶大學(xué);2012年

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