本文關(guān)鍵詞： 隧道圍巖 蠕變 Burgers模型 粘彈性解 參數(shù)反演 襯砌 數(shù)值模擬　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隧道工程的建造是百年大計(jì),要求在此期間內(nèi)保證隧道結(jié)構(gòu)的安全可靠,而隧道圍巖的蠕變特性是影響隧道結(jié)構(gòu)安全性以及正常使用的重要因素,所以研究圍巖蠕變特性對(duì)隧道襯砌結(jié)構(gòu)受力特點(diǎn)的影響就顯得尤為重要。針對(duì)上述問題,本文以唐家塬隧道為工程依托,對(duì)考慮蠕變特性的隧道圍巖與襯砌結(jié)構(gòu)相互作用規(guī)律進(jìn)行了理論分析和數(shù)值模擬研究,得出以下結(jié)論:1、總結(jié)分析了常用流變模型的流變特性和適用的巖體類型,就其模型特征進(jìn)行了對(duì)比分析。結(jié)合唐家塬隧道變形監(jiān)測(cè)數(shù)據(jù),選擇Burgers模型為該隧道圍巖的蠕變模型。2、采用位移反分析方法,以理論計(jì)算公式和實(shí)際監(jiān)測(cè)數(shù)據(jù)為依據(jù),對(duì)唐家塬隧道圍巖的Burgers模型的蠕變參數(shù)進(jìn)行了反演分析,獲得了隧道圍巖的蠕變參數(shù)。3、將隧道圍巖視為蠕變介質(zhì),且符合Buegers模型,將襯砌結(jié)構(gòu)視為彈性體,利用“彈性—粘彈性”對(duì)應(yīng)原理,推導(dǎo)了圓形隧道在二向不等壓條件下圍巖與襯砌間相互作用力隨時(shí)間變化的解析解,進(jìn)一步根據(jù)隧道設(shè)計(jì)規(guī)范關(guān)于襯砌安全系數(shù)的規(guī)定,得到了襯砌安全系數(shù)的粘彈性解。4、利用“當(dāng)量半徑法”將唐家塬隧道轉(zhuǎn)化為圓形隧道計(jì)算,得到了唐家塬隧道襯砌結(jié)構(gòu)與圍巖相互作用力隨時(shí)間的變化規(guī)律,進(jìn)一步分析襯砌安全系數(shù),得到了唐家塬隧道襯砌結(jié)構(gòu)安全系數(shù)在設(shè)計(jì)使用年限內(nèi)的變化曲線。5、應(yīng)用FLAC3D數(shù)值模擬軟件,對(duì)唐家塬隧道襯砌結(jié)構(gòu)受圍巖蠕變作用下的應(yīng)力分布及變化特點(diǎn)進(jìn)行了模擬。得到了相關(guān)結(jié)論:在隧道完成施工后的前10年中,隧道襯砌結(jié)構(gòu)受到圍巖蠕變特性影響相對(duì)明顯,而在隨后的10至40年內(nèi)應(yīng)力逐漸調(diào)整,之后是相對(duì)穩(wěn)定階段,雖然襯砌應(yīng)力仍在增大,但增大速度很小。6、對(duì)比分析了隧道襯砌結(jié)構(gòu)各特征點(diǎn)處圍巖壓力以及安全系數(shù)的理論值和模擬值,結(jié)果表明理論值與模擬值雖然存在一定的差別,但其變化趨勢(shì)和變化范圍大體相當(dāng),證明了理論計(jì)算的適用性,并對(duì)實(shí)際工程具有一定的指導(dǎo)意義。
[Abstract]:The construction of the tunnel project is a long-term requirements during this period to ensure the tunnel structure is safe and reliable, and the creep characteristics of tunnel surrounding rock is affecting the structural safety of the tunnel and the important factors affect the normal use, so study on creep characteristics of surrounding rock of tunnel lining structure stress characteristic is particularly important. In view of the above problems, this paper takes Tang Jia Yuan tunnel, rule of tunnel surrounding rock and lining structure of considering creep interaction of theoretical analysis and numerical simulation study, the following conclusions: 1, summarizes and analyzes the rheological properties of rheological models and applicable rock types, analyzed the characteristics of the model. Combined with the Tang Jiayuan tunnel deformation monitoring data. Select the Burgers model for the.2 creep model of tunnel surrounding rock, using the displacement back analysis method, the theoretical calculation formula and the actual number of monitoring According to the basis of the creep parameters of the Burgers model of the surrounding rock tunnel of Tang Jia Yuan inverse analysis, obtained the.3 creep parameters of surrounding rock of tunnel, the tunnel surrounding rock creep as medium, and in accordance with the Buegers model, the lining structure is regarded as an elastic body, the elastic viscoelastic correspondence principle ", are analyzed. The circular tunnel interaction in two to isobaric conditions of surrounding rock and lining between the time-dependent solution, according to the design specification on tunnel lining safety coefficient, viscoelastic lining safety coefficient is obtained by solution of.4, the" equivalent radius method "Tang Jiayuan tunnel into the circular tunnel calculation, obtains the variation law of Tang Dynasty Jiayuan the tunnel lining structure and surrounding rock interaction with time, further analysis of the lining safety coefficient, the Tang Jia Yuan tunnel lining safety coefficient in design in service The change curve of.5, using numerical simulation software FLAC3D, the Tang Jia Yuan tunnel lining structure under the action of rock creep under the stress distribution and variation characteristics were simulated. The conclusions were obtained: 10 years ago after the completion of the tunnel construction, tunnel lining structure is affected by the characteristics of the surrounding rock creep is relatively obvious, and gradually adjust in the next 10 to 40 years after the stress is relatively stable, although the lining stress is still increased, but the increasing speed of.6 is very small, comparative analysis of the features of tunnel lining structure of surrounding rock pressure and safety coefficient of the theoretical value and the simulation value, the results show that the theoretical values and simulation values although there are certain differences however, the changing trend and the change range of roughly the same, demonstrate the applicability of the theoretical calculation, and has a certain guiding significance to the actual project.

【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U451

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