忠萬(wàn)高速公路小嶺隧道出口段圍巖及邊坡穩(wěn)定性研究
本文選題:隧道洞口 切入點(diǎn):圍巖變形 出處:《重慶大學(xué)》2015年碩士論文
【摘要】:隧道洞口施工難以避免出現(xiàn)滑坡、崩塌、偏壓、泥石流和雪崩等地質(zhì)災(zāi)害,滑坡是其中最常見(jiàn)的地質(zhì)災(zāi)害。洞口施工是隧道施工中的首要工程。本文主要結(jié)合重慶市忠萬(wàn)高速A8標(biāo)段小嶺隧道洞口段的工程實(shí)際情況,通過(guò)調(diào)查分析、現(xiàn)場(chǎng)監(jiān)測(cè)和數(shù)值模擬等手段,研究了隧道洞口段圍巖應(yīng)力分布及邊坡變形破壞規(guī)律;總結(jié)了影響隧道洞口段圍巖及邊仰坡穩(wěn)定性的基本因素;得出隧道洞口段圍巖變形及邊坡破壞模式洞口邊仰坡的破壞機(jī)理;分析了隧道洞口段圍巖及邊坡穩(wěn)定性。完成的主要工作和取得的成果如下:①通過(guò)對(duì)小嶺隧道出口段的地質(zhì)情況進(jìn)行分析,得出小嶺隧道出口段天然斜坡整體穩(wěn)定,出口段人工仰坡穩(wěn)定性較差;得出影響小嶺隧道出口段圍巖及邊坡穩(wěn)定性的主要因素:地形地貌、巖體性質(zhì)、巖體結(jié)構(gòu)、大氣降雨等。②研究了隧道洞口段圍巖變形特征及邊坡破壞模式,得出小嶺隧道洞口段圍巖破壞類(lèi)型分為:1)局部落石破壞;2)圍巖整體破壞;3)潮解膨脹破壞;邊坡的破壞模式主要為:平面滑動(dòng)破壞和局部塌陷破壞。③通過(guò)建立洞口段力學(xué)模型,計(jì)算得出了淺埋隧道洞口段的圍巖壓力,并得出圍巖穩(wěn)定性安全系數(shù)N。選用簡(jiǎn)化Janbu法分析隧道洞口邊坡穩(wěn)定性,并根據(jù)小嶺隧道出口段實(shí)際情況建立相應(yīng)的計(jì)算模型,分析得出在連續(xù)降雨情況下,小嶺隧道出口段邊坡存在滑坡危險(xiǎn)性。④采用FLAC3D數(shù)值模擬軟件分析了小嶺隧道洞口段自然狀態(tài)下和開(kāi)挖狀態(tài)下的圍巖及邊坡的穩(wěn)定性,得出了相應(yīng)的應(yīng)力特征、位移特征和穩(wěn)定性情況。數(shù)值模擬結(jié)果表明:隧道洞口段開(kāi)挖對(duì)于淺埋隧道在隧道軸線附近的地表巖土體產(chǎn)生較大的地表沉降,出口右洞地表沉降量大于出口左洞地表沉降量,并在進(jìn)洞2B~2.5B(洞徑)處,拱頂下沉達(dá)到最大,拱頂部位易發(fā)生冒頂、坍塌等事故。⑤通過(guò)現(xiàn)場(chǎng)監(jiān)控量測(cè)和數(shù)據(jù)處理分析得到了小嶺隧道洞口段圍巖變形特征,分別從時(shí)間效應(yīng)和空間效應(yīng)入手做了進(jìn)一步闡述,對(duì)洞口圍巖變形進(jìn)行監(jiān)測(cè)分析,總結(jié)了山嶺隧道洞口圍巖變形特征。
[Abstract]:It is difficult to avoid geological disasters such as landslide, collapse, partial pressure, debris flow and avalanche in tunnel opening construction. Landslide is one of the most common geological hazards. The construction of tunnel entrance is the most important project in tunnel construction. This paper mainly combines with the actual engineering situation of Xiaoling tunnel entrance section of Zhongwan high speed A8 highway in Chongqing, through investigation and analysis. Field monitoring and numerical simulation are used to study the stress distribution of surrounding rock and the law of slope deformation and failure, and the basic factors affecting the stability of surrounding rock and side slope of tunnel entrance are summarized. The mode of surrounding rock deformation and slope failure in tunnel entrance section is obtained. The stability of surrounding rock and slope in tunnel entrance section is analyzed. The main work and results obtained are as follows: 1 by analyzing the geological condition of the exit section of Xiaoling tunnel, it is concluded that the natural slope of the exit section of Xiaoling tunnel is stable as a whole. The main factors influencing the stability of surrounding rock and slope in the exit section of Xiaoling tunnel are: topography, rock mass property, rock mass structure, The deformation characteristics of surrounding rock and the failure mode of slope are studied in this paper. The results show that the failure type of surrounding rock in Xiaoling tunnel is divided into two types: 1) local rock falling and 2) mass failure of surrounding rock and 3) tidal solution expansion failure. The failure modes of the slope are as follows: plane sliding failure and local collapse failure .3 the surrounding rock pressure of the shallow tunnel entrance section is calculated by establishing the mechanical model of the tunnel entrance section. The simplified Janbu method is used to analyze the slope stability of tunnel entrance, and the corresponding calculation model is established according to the actual situation of the exit section of Xiaoling tunnel. The analysis shows that under the condition of continuous rainfall, Danger of landslide at the exit of Xiaoling Tunnel. 4 the stability of surrounding rock and slope in natural state and excavation state of the mouth section of Xiaoling tunnel is analyzed by using FLAC3D numerical simulation software, and the corresponding stress characteristics are obtained. The numerical simulation results show that the excavation of the tunnel mouth section produces a large surface settlement of the shallow tunnel near the tunnel axis, and the surface settlement of the exit right hole is larger than that of the exit left hole. In addition, at 2BX 2.5B (diameter), the maximum dome subsidence is obtained, and the deformation characteristics of surrounding rock of Xiaoling tunnel entrance are obtained through on-site monitoring measurements and data processing, such as caving prone to roof fall, collapse and other accidents. Based on the time effect and space effect, the deformation of surrounding rock at the entrance of the tunnel is monitored and analyzed, and the deformation characteristics of the surrounding rock at the entrance of the mountain tunnel are summarized.
【學(xué)位授予單位】:重慶大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:U451.2
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