本文關(guān)鍵詞： 強(qiáng)風(fēng)化花崗巖 邊坡穩(wěn)定 三軸剪切試驗(yàn) 有限元分析 現(xiàn)場(chǎng)監(jiān)測(cè) 路堤變形特性　出處：《長(zhǎng)安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：高速公路對(duì)路基穩(wěn)定性有較高的要求。目前我國(guó)對(duì)花崗巖風(fēng)化料的研究還遠(yuǎn)遠(yuǎn)不能解決設(shè)計(jì)和施工中出現(xiàn)的問題，因此對(duì)強(qiáng)風(fēng)化花崗巖的風(fēng)化機(jī)理、風(fēng)化特征以及風(fēng)化料的路用特性進(jìn)行系統(tǒng)的研究，對(duì)于高等級(jí)公路的建設(shè)具有重要的意義。 對(duì)強(qiáng)風(fēng)化花崗巖進(jìn)行了大型壓縮試驗(yàn)、三軸剪切試驗(yàn)（CU），得到了強(qiáng)風(fēng)化花崗巖在CU條件下的摩爾強(qiáng)度包線。從該強(qiáng)度包線可以看出強(qiáng)風(fēng)化花崗巖的粘聚力是增大到一定值之后開始減小，而內(nèi)摩擦角存在持續(xù)減小的現(xiàn)象。利用大型三軸儀對(duì)風(fēng)化巖進(jìn)行試驗(yàn)發(fā)現(xiàn)風(fēng)化巖并不具備浸水喪失強(qiáng)度的特性，，性能較為穩(wěn)定，適宜作為路基填料。 利用有限元方法對(duì)強(qiáng)風(fēng)化花崗巖高邊坡的穩(wěn)定性進(jìn)行了分析，確定了邊坡坡度較優(yōu)設(shè)計(jì)形式，分析了降雨對(duì)邊坡安全狀況的影響。有限元模擬結(jié)果表明降雨對(duì)強(qiáng)風(fēng)化花崗巖填筑的高填方路堤的影響較大，需要采取一定防護(hù)措施。 通過有限元和現(xiàn)場(chǎng)監(jiān)測(cè)對(duì)風(fēng)化花崗巖路堤的沉降特性進(jìn)行了分析；采用FLAC3D軟件與編制的鄧肯-張本構(gòu)模型對(duì)強(qiáng)風(fēng)化花崗巖風(fēng)化料路堤的穩(wěn)定性進(jìn)行了分析。數(shù)值計(jì)算的結(jié)果顯示：對(duì)于平坦的弱風(fēng)化巖地基上填筑的風(fēng)化花崗巖高填方路堤整體沉降量變化較小，滿足設(shè)計(jì)要求；斜坡上的高填方路堤路肩處沉降相對(duì)于中央帶、行車帶位置處的沉降要小，數(shù)值計(jì)算的結(jié)果與實(shí)測(cè)結(jié)果基本符合。
[Abstract]:The highway has higher requirements for the stability of roadbed. At present, the research on granite weathering material in China is far from solving the problems in design and construction, so the weathering mechanism of strongly weathered granite can not be solved. The systematic study of weathering characteristics and road characteristics of weathered materials is of great significance to the construction of high-grade highways. A large scale compression test of strongly weathered granite was carried out. In triaxial shear test, the molar strength envelope of strongly weathered granite under CU condition is obtained. From this strength envelope, it can be seen that the cohesive force of strongly weathered granite increases to a certain value and begins to decrease. However, the internal friction angle is decreasing continuously. The test of weathered rock with large triaxial instrument shows that the weathered rock does not possess the characteristics of water immersion and loss of strength, and its performance is relatively stable, so it is suitable for subgrade filling. The stability of high slope of strongly weathered granite is analyzed by finite element method, and the optimum design form of slope is determined. The effect of rainfall on slope safety is analyzed. The finite element simulation results show that rainfall has a great influence on the high fill embankment filled with strongly weathered granite, and some protective measures should be taken. The settlement characteristics of weathered granite embankment are analyzed by finite element method and field monitoring. The stability of weathering material embankment of strongly weathered granite is analyzed by using the FLAC3D software and the Duncan Zhang Ben model. The numerical results show that the weathered granite filled on the flat weak weathered rock foundation is high. The overall settlement of embankment has little change. The settlement at the shoulder of the high fill embankment on the slope is smaller than that at the central zone, and the settlement at the location of the driving belt is small, and the numerical results are in good agreement with the measured results.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.12;U412.366

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 向桂馥;點(diǎn)荷載試驗(yàn)——一種研究巖體風(fēng)化分帶的快速方法[J];成都地質(zhì)學(xué)院學(xué)報(bào);1985年02期

2 張麗萍,朱大奎,楊達(dá)源;長(zhǎng)江三峽壩區(qū)花崗巖風(fēng)化殼化學(xué)元素遷移特征[J];地理學(xué)報(bào);2001年05期

3 王彥華,謝先德,羅立峰;花崗巖中黑云母風(fēng)化的礦物變化機(jī)制[J];地球化學(xué);1999年03期

4 吳梅賢,李獻(xiàn)華,劉穎,衛(wèi)克勤;廣東英德白沙佛岡花崗巖風(fēng)化殼地下水中的稀土元素[J];地球化學(xué);2003年04期

5 曾昭璇;我國(guó)南部紅土區(qū)的水土流失問題[J];第四紀(jì)研究;1991年01期

6 殷坤龍,汪洋,唐仲華;降雨對(duì)滑坡的作用機(jī)理及動(dòng)態(tài)模擬研究[J];地質(zhì)科技情報(bào);2002年01期

7 尚彥軍,吳宏偉,曲永新;花崗巖風(fēng)化程度的化學(xué)指標(biāo)及微觀特征對(duì)比——以香港九龍地區(qū)為例[J];地質(zhì)科學(xué);2001年03期

8 任國(guó)林;尹子良;閆運(yùn)來;母廣成;;廈門花崗巖風(fēng)化殼工程地質(zhì)分帶及風(fēng)化巖石的工程地質(zhì)特征[J];福建地質(zhì);1990年02期

9 曲永新,吳宏偉,尚彥軍;華南花崗巖殘積土紅土化程度的地帶性與香港該類土不發(fā)育的原因[J];工程地質(zhì)學(xué)報(bào);2000年01期

10 馮金良;粘性土（紅土）中游離氧化鐵含量對(duì)其工程地質(zhì)性質(zhì)的影響[J];工程地質(zhì)學(xué)報(bào);1996年01期

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