發(fā)布時間：2019-01-02 16:55

【摘要】：工程建設中,往往會遇到大量的邊坡工程。邊坡工程建設過程中邊坡失穩(wěn)是一種全球性的地質(zhì)災害,與地震、火山同被列為全球三大地質(zhì)災害。邊坡的失穩(wěn)破壞事故,給人類帶來了嚴重的生命與財產(chǎn)損失,因此,針對邊坡工程施工過程中開挖與支護問題的探討與研究,以及邊坡的穩(wěn)定性分析是工程建設中一項必不可少的任務。本文結(jié)合豐寧輸水隧道出口高邊坡實際地質(zhì)情況和開挖支護施工情況,使用大型通用有限元軟件ANSYS對邊坡進行有限元數(shù)值模擬分析。 結(jié)合輸水隧洞出口高邊坡實際工程地質(zhì)條件,充分考慮現(xiàn)場開挖支護施工順序,運用有限元軟件ANSYS對邊坡開挖及支護過程進行模擬,獲得不同開挖階段及支護下邊坡的最大變形、最大應力等的分布情況。經(jīng)過分析可知：邊坡在天然狀態(tài)下穩(wěn)定；邊坡開挖過程中加以錨噴支護是必要的,且錨噴支護能較好的改變邊坡表面應力分布；第三階段邊坡開挖時坡腳位移變化較大,所以爆破時一定要留足保護層,防止對坡體造成大的擾動,發(fā)生邊坡失穩(wěn)。 基于有限元強度折減系數(shù)法,依次選取折減系數(shù),分別對原始坡體和開挖支護完成后邊坡的強度參數(shù)進行折減,將折減后的參數(shù)輸入進行有限元計算,根據(jù)坡體失穩(wěn)判據(jù),計算獲得原始邊坡和開挖支護完成后邊坡的安全系數(shù)。通過分析不同折減系數(shù)下的收斂曲線、水平位移、塑性變形模擬結(jié)果得出：原始邊坡的強度折減系數(shù)為F=6.31,即邊坡模型的安全系數(shù)為6.31；開挖支護完成邊坡的強度折減系數(shù)為F=5.0,即邊坡模型的安全系數(shù)為5.0,又因為該邊坡安全系數(shù)大于一級邊坡安全系數(shù)1.35,所以說該邊坡是穩(wěn)定的。 通過本文分析,結(jié)合數(shù)值模擬結(jié)果,討論了該邊坡易失穩(wěn)情況,為輸水隧道進洞施工防護提供參考。
[Abstract]:A large number of slope projects are often encountered in engineering construction. Slope instability is a global geological hazard in the process of slope engineering construction. It is classified as the three major geological hazards in the world along with earthquakes and volcanoes. The failure accident of slope instability has brought serious loss of life and property to human beings. Therefore, the study and research on excavation and support during the construction of slope engineering is carried out. And slope stability analysis is an indispensable task in engineering construction. Combined with the actual geological conditions of the high slope at the outlet of Fengning water conveyance tunnel and the construction of excavation and support, the finite element numerical simulation analysis of the slope is carried out by using the large and universal finite element software ANSYS. Combined with the actual engineering geological conditions of the high slope at the outlet of the water conveyance tunnel, the construction sequence of the field excavation and support is fully considered, and the excavation and support process of the slope is simulated by using the finite element software ANSYS. The distribution of maximum deformation and maximum stress of slope under different excavation stages and supporting conditions are obtained. Through the analysis, we can know that the slope is stable in the natural state, the bolting and shotcreting is necessary in the course of the slope excavation, and the bolting and shotcrete support can change the surface stress distribution of the slope. During the third stage of slope excavation, the displacement of slope foot changes greatly, so it is necessary to leave sufficient protective layer during blasting to prevent large disturbance to slope body and slope instability. Based on the finite element strength reduction coefficient method, the strength parameters of the original slope body and the slope after excavation support are reduced, and the reduced parameters are inputted into the finite element method. The safety factors of the original slope and the slope after excavation are calculated. By analyzing the convergence curve, horizontal displacement and plastic deformation of the original slope, it is concluded that the strength reduction coefficient of the original slope is F _ (6.31), that is, the safety factor of the slope model is 6.31; The strength reduction coefficient of the slope completed by excavation and support is F5.0, that is, the safety factor of the slope model is 5.0, and because the safety factor of the slope is larger than 1.35 of the first-grade slope, the slope is stable. Through the analysis of this paper, combined with the numerical simulation results, the instability of the slope is discussed, which provides a reference for the construction protection of the water conveyance tunnel.
【學位授予單位】：山東農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV672;TV223

【參考文獻】

相關(guān)期刊論文 前7條

1 魏海波,吳敏;邊坡的有限元分析及ANSYS軟件對邊坡開挖的模擬[J];云南水力發(fā)電;2004年04期

2 鄭穎人,趙尚毅;有限元強度折減法在土坡與巖坡中的應用[J];巖石力學與工程學報;2004年19期

3 鄭穎人;趙尚毅;;邊(滑)坡工程設計中安全系數(shù)的討論[J];巖石力學與工程學報;2006年09期

4 連鎮(zhèn)營,韓國城,孔憲京;強度折減有限元法研究開挖邊坡的穩(wěn)定性[J];巖土工程學報;2001年04期

5 趙尚毅,鄭穎人,時衛(wèi)民,王敬林;用有限元強度折減法求邊坡穩(wěn)定安全系數(shù)[J];巖土工程學報;2002年03期

6 宋二祥;土工結(jié)構(gòu)安全系數(shù)的有限元計算[J];巖土工程學報;1997年02期

7 趙尚毅,鄭穎人,張玉芳;極限分析有限元法講座——Ⅱ有限元強度折減法中邊坡失穩(wěn)的判據(jù)探討[J];巖土力學;2005年02期

，

本文編號：2398747