【摘要】：隨著西部大開發(fā)戰(zhàn)略如火如荼的進(jìn)行，我國高速公路的建設(shè)迎來了屬于自己的春天。但是西部地區(qū)的地形、地質(zhì)條件復(fù)雜，山嶺和丘陵較多，山嶺隧道占整條線路的比重較大，成為評(píng)價(jià)高速公路的一個(gè)重要指標(biāo)。而隧道施工的安全取決于對(duì)圍巖穩(wěn)定狀態(tài)的判斷，因此隧道監(jiān)控量測技術(shù)的應(yīng)用變得尤為重要。本文以臨夏至合作的高速公路的雙城隧道為工程背景，根據(jù)施工現(xiàn)場的監(jiān)控量測數(shù)據(jù)，對(duì)雙城隧道的圍巖穩(wěn)定性進(jìn)行分析，并借助MIDAS/GTS軟件加以對(duì)比分析。本文的主要內(nèi)容如下： （1）簡述了雙城隧道的工程概況，并結(jié)合監(jiān)控量測技術(shù)的發(fā)展現(xiàn)狀和規(guī)范要求，介紹了雙城隧道監(jiān)控量測方案。該方案對(duì)雙城隧道監(jiān)測項(xiàng)目的量測方法、量測頻率和測點(diǎn)斷面的布置做了詳細(xì)闡述。主要結(jié)論：雙城隧道的監(jiān)測方案完全符合規(guī)范要求。 （2）通過對(duì)圍巖穩(wěn)定性判定方法和監(jiān)測數(shù)據(jù)分析方法的介紹，結(jié)合隧道監(jiān)控量測的控制基準(zhǔn)，應(yīng)用Origin軟件對(duì)雙城隧道典型斷面DZK19+340的拱頂沉降和周邊位移和出口段DYK19+952斷面的地表下沉進(jìn)行分析，并探討了二次襯砌的最佳施作時(shí)間。主要結(jié)論： ①典型斷面DZK19+340的累計(jì)拱頂沉降量和累計(jì)周邊位移值符合規(guī)范要求，位移和速率隨時(shí)間變化的曲線符合規(guī)律，該斷面的圍巖處于穩(wěn)定狀態(tài)。 ②出口段斷面DYK19+952的累計(jì)地表下沉值符合規(guī)范要求，其下沉值和速率隨時(shí)間的變化曲線符合規(guī)律。 ③典型斷面DZK19+340的二次襯砌最佳施作時(shí)間為上臺(tái)階開挖后的第34天。 （3）借助MIDAS/GTS軟件對(duì)實(shí)際開挖工法（臺(tái)階法）、上導(dǎo)坑法、全斷面法的施工過程進(jìn)行模擬，得出三種開挖工法在斷面DZK19+340發(fā)生的拱頂沉降和周邊位移，通過其與實(shí)測數(shù)據(jù)的對(duì)比分析，得出雙城隧道的最合理開挖工法。主要結(jié)論： ①臺(tái)階法開挖模擬結(jié)果表明，雙城隧道的圍巖應(yīng)力場、位移場和初期支護(hù)結(jié)構(gòu)的受力均符合要求。 ②典型斷面DZK19+340的累計(jì)拱頂沉降量、累計(jì)周邊位移值均大于臺(tái)階法開挖的模擬值和上導(dǎo)坑法開挖的模擬值，小于全斷面開挖的模擬值，但是三種開挖工法的模擬結(jié)果隨時(shí)間的變化曲線變化均為“拋物線”型，符合規(guī)律。 ③從技術(shù)、經(jīng)濟(jì)和安全的角度出發(fā)，雙城隧道采用的臺(tái)階法開挖及施工工序符合本工程要求。
[Abstract]:With the western development strategy in full swing, China's highway construction ushered in its own spring. However, the topography and geological conditions of the western region are complicated, there are more mountains and hills, and mountain tunnels account for a large proportion of the whole route, so it is an important index to evaluate the highway. The safety of tunnel construction depends on the judgement of the stability of surrounding rock, so the application of tunnel monitoring and measurement technology becomes more and more important. Based on the engineering background of Shuangcheng Tunnel of Linxia to Cooperation Expressway, the stability of surrounding rock of Shuangcheng Tunnel is analyzed according to the monitoring and measuring data of construction site, and the stability of surrounding rock of Shuangcheng Tunnel is analyzed by means of MIDAS/GTS software. The main contents of this paper are as follows: (1) the engineering survey of Shuangcheng Tunnel is briefly described, and the monitoring and measurement scheme of Shuangcheng Tunnel is introduced in combination with the development status and specification requirements of monitoring and measurement technology. The method, frequency and section layout of the monitoring project of Shuangcheng Tunnel are described in detail. The main conclusion is that the monitoring scheme of Shuangcheng Tunnel fully meets the requirements of the specification. (2) through the introduction of the determination method of surrounding rock stability and the analysis method of monitoring data, combined with the control datum of tunnel monitoring measurement, The dome settlement and peripheral displacement of typical section DZK19 340 of Shuangcheng tunnel and the surface subsidence of section DYK19 952 of outlet section of Shuangcheng tunnel were analyzed by using Origin software, and the optimum application time of secondary lining was discussed. The main conclusions are as follows: (1) the cumulative dome settlement and the cumulative peripheral displacement of typical section DZK19 340 are in accordance with the specifications, and the curves of displacement and velocity change with time accord with the law. The surrounding rock of this section is in a stable state. (2) the cumulative surface subsidence value of section DYK19 952 at the exit section meets the requirements of the specification. The curves of subsidence value and rate with time accord with the rule. 3 the optimum time of secondary lining of typical section DZK19 340 is the 34th day after the excavation of the upper step. (3) the actual excavation is carried out with the help of MIDAS/GTS software. Law (class law), the method of going up to the pit, The construction process of full section method is simulated, and the dome settlement and peripheral displacement of three excavation methods in section DZK19 340 are obtained. Through the comparison and analysis of the measured data, the most reasonable excavation method of Shuangcheng Tunnel is obtained. The main conclusions are as follows: 1 the simulation results of bench excavation show that the stress field of surrounding rock, displacement field and initial supporting structure of Shuangcheng Tunnel all meet the requirements. (2) the cumulative settlement of arch roof of typical section DZK19 340 is satisfied. The accumulative peripheral displacement values are larger than the simulated values of bench excavation method and upper guide pit excavation method, and are smaller than those of full-section excavation. However, the variation curves of the three excavation methods with time are all parabola type. From the point of view of technology, economy and safety, the excavation and construction procedure of Shuangcheng Tunnel by step method meets the requirements of this project.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U456.3

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本文編號(hào)：2139948