本文選題：高地應(yīng)力　切入點(diǎn)：軟巖　出處：《蘭州交通大學(xué)》2014年碩士論文

【摘要】：新建蘭渝鐵路是我國(guó)重點(diǎn)支撐性基礎(chǔ)設(shè)施項(xiàng)目，論文以新建蘭渝鐵路木寨嶺隧道為研究背景，結(jié)合木寨嶺隧道現(xiàn)場(chǎng)施工方法、監(jiān)控量測(cè)實(shí)測(cè)項(xiàng)目，運(yùn)用數(shù)值模擬方法進(jìn)行高地應(yīng)力軟巖大變形控制技術(shù)方面的研究。 論文針對(duì)木寨嶺隧道施工現(xiàn)場(chǎng)因大變形產(chǎn)生的拱架變形、二襯開裂等問題開展了以下研究： （1）論文根據(jù)木寨嶺隧道的工程地質(zhì)情況，結(jié)合室內(nèi)土工試驗(yàn)的試驗(yàn)結(jié)果，選取模型材料計(jì)算參數(shù)；在隧道施工現(xiàn)場(chǎng)選取典型斷面，監(jiān)測(cè)斷面開挖后圍巖的變形情況，并對(duì)監(jiān)測(cè)數(shù)據(jù)進(jìn)行回歸分析，得出木寨嶺隧道高地應(yīng)力大變形軟巖的變化規(guī)律。 （2）論文運(yùn)用有限元軟件MIDAS-GTS對(duì)木寨嶺隧道三臺(tái)階法施工進(jìn)行數(shù)值模擬，研究隧道開挖過程中圍巖隨開挖步和掌子面相對(duì)位置變化引起的變形所占總變形的比例，得出控制大變形的技術(shù)措施，進(jìn)一步研究隧道塑性區(qū)范圍、側(cè)壓力系數(shù)對(duì)支護(hù)結(jié)構(gòu)變形、應(yīng)力的影響，提出支護(hù)方式的優(yōu)化措施。 （3）通過模擬有大拱腳二襯和無(wú)大拱腳二襯施工，，研究在兩種情況下隧道圍巖的變形、受力特點(diǎn)，驗(yàn)證二襯澆筑技術(shù)改進(jìn)的合理性和有效性，提出隧道二襯施工的優(yōu)化措施。 （4）通過對(duì)木寨嶺隧道CRD法施工過程的數(shù)值分析，對(duì)比三臺(tái)階法施工的圍巖受力變形情況，為木寨嶺隧道施工方法的選取提出建設(shè)性意見。 論文得出了如下研究成果： （1）通過對(duì)木寨嶺隧道監(jiān)測(cè)數(shù)據(jù)的回歸分析處理驗(yàn)證了現(xiàn)場(chǎng)施工方法、支護(hù)形式的合理性，能夠較準(zhǔn)確地判斷二襯施做得合理時(shí)機(jī)，并為必要時(shí)及時(shí)調(diào)整支護(hù)結(jié)構(gòu)提供有力依據(jù)。 （2）數(shù)值模擬結(jié)果表明收斂曲線開挖面前方先行變形占總變形的32.8%，掌子面變形占總變形的54.9%，掌子面后方變形占總變形的12.3%，軟弱圍巖隧道施工中加強(qiáng)拱部超前支護(hù)對(duì)控制大變形有重要作用，由此提出有效的高地應(yīng)力軟巖隧道大變形控制技術(shù)。 （3）通過對(duì)有大拱腳二襯和無(wú)大拱腳二襯數(shù)值模擬，計(jì)算結(jié)果表明有大拱腳二襯圍巖拱頂下沉值比無(wú)大拱腳二襯圍巖減小36%，有大拱腳二襯圍巖水平收斂值比無(wú)大拱腳二襯減小38%，表明與無(wú)大拱腳二襯相比，有大拱腳二襯可以明顯減小圍巖拱頂下沉值、水平收斂值。 （4）運(yùn)用有限元軟件對(duì)木寨嶺隧道CRD法進(jìn)行數(shù)值模擬，計(jì)算結(jié)果表明：與三臺(tái)階法相比，CRD法施工圍巖拱頂沉降減少10%，水平收斂減少12%，應(yīng)力變化曲線更平緩，變化幅度更小，支護(hù)結(jié)構(gòu)更合理。 綜上所述，論文結(jié)合木寨嶺隧道現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)，進(jìn)行了大量數(shù)值模擬計(jì)算，驗(yàn)證了現(xiàn)場(chǎng)施工方法的合理性，并提出了更合理的大變形控制技術(shù)及優(yōu)化措施，為木寨嶺隧道及類似隧道的設(shè)計(jì)施工提出了有效的建議，產(chǎn)生了較好的經(jīng)濟(jì)效益和社會(huì)效益。
[Abstract]:The newly built Lanzhou-Chongqing Railway is an important supporting infrastructure project in China. This paper takes the Muzhai Ridge Tunnel of the Lanzhou-Chongqing Railway as the research background, combined with the field construction method of the Muzhailing Tunnel, monitoring and measuring the actual measurement project.Numerical simulation method is used to study the control technology of large deformation of soft rock with high ground stress.Aiming at the problems of arch frame deformation and second lining cracking caused by large deformation in the construction site of Muzhailing tunnel, this paper has carried out the following research:1) according to the engineering geology of Muzhailing tunnel and the test result of indoor geotechnical test, the model material parameters are selected, the typical section is selected in the tunnel construction site, and the deformation of surrounding rock after excavation is monitored.By regression analysis of monitoring data, the variation law of soft rock with high ground stress and large deformation in Muzhailing tunnel is obtained.In this paper, the numerical simulation of the three step method construction of Muzhailing tunnel is carried out by using the finite element software MIDAS-GTS, and the proportion of the deformation caused by the change of the surrounding rock with the relative position of the excavation step and the face of the face in the tunnel excavation is studied.The technical measures to control the large deformation are obtained, and the influence of the range of the plastic zone of the tunnel and the coefficient of lateral pressure on the deformation and stress of the supporting structure is further studied, and the optimization measures of the supporting mode are put forward.3) by simulating the construction with and without large arch foot, the deformation and stress characteristics of surrounding rock in tunnel are studied, the rationality and validity of the improvement of second lining pouring technology are verified, and the optimization measures of tunnel construction are put forward.4) through the numerical analysis of the construction process of the CRD method of Muzhailing tunnel, the stress and deformation of surrounding rock in the construction of the three classes method are compared, and the constructive suggestions for the selection of the construction method of the tunnel are put forward.The research results are as follows:1) through the regression analysis of the monitoring data of Muzhailing tunnel, it is proved that the construction method is reasonable and the support form is reasonable, which can judge the reasonable time of the second lining construction accurately, and provide a strong basis for adjusting the supporting structure in time when necessary.The numerical simulation results show that the forward deformation of convergence curve is 32.8% of the total deformation, that of palm surface is 54.9%, that of the rear face of palm surface is 12.3% of the total deformation, and that the advance support of arch part should be strengthened in the construction of soft surrounding rock tunnel.Controlling large deformation plays an important role.Therefore, an effective control technique for large deformation of soft rock tunnel with high ground stress is put forward.(3) by numerical simulation of two linings with and without large arches,The calculation results show that the settlement value of surrounding rock arch with large arch foot is 36 times smaller than that without large arch foot, and the horizontal convergence value of surrounding rock with large arch foot is 38 less than that with no large arch foot, which shows that compared with the second wall rock with no large arch foot, the horizontal convergence value of surrounding rock with large arch foot is reduced by 38 percent compared with that without large arch foot.The second liner with large arch foot can obviously reduce the value of the wall rock arch roof subsidence and the horizontal convergence value.4) the numerical simulation of CRD method for Muzhailing tunnel is carried out by using finite element software. The results show that compared with the three class method, the settlement of surrounding rock arch is reduced by 10%, the horizontal convergence is reduced by 12%, the stress change curve is more gentle and the change range is smaller than that of the three class method.The supporting structure is more reasonable.To sum up, the paper combines the monitoring data of Muzhailing tunnel, carries out a large number of numerical simulation calculations, verifies the rationality of the field construction method, and puts forward more reasonable large deformation control technology and optimization measures.Effective suggestions for the design and construction of Muzhailing tunnel and similar tunnels are put forward, and good economic and social benefits are obtained.
【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)】：U455.4

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