發(fā)布時間：2018-01-24 10:44

  本文關鍵詞： 隧道圍巖 蠕變 Burgers模型 粘彈性解 參數反演 襯砌 數值模擬　出處：《西安科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：隧道工程的建造是百年大計,要求在此期間內保證隧道結構的安全可靠,而隧道圍巖的蠕變特性是影響隧道結構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隧道襯砌結構受力特點的影響就顯得尤為重要。針對上述問題,本文以唐家塬隧道為工程依托,對考慮蠕變特性的隧道圍巖與襯砌結構相互作用規(guī)律進行了理論分析和數值模擬研究,得出以下結論:1、總結分析了常用流變模型的流變特性和適用的巖體類型,就其模型特征進行了對比分析。結合唐家塬隧道變形監(jiān)測數據,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,以理論計算公式和實際監(jiān)測數據為依據,對唐家塬隧道圍巖的Burgers模型的蠕變參數進行了反演分析,獲得了隧道圍巖的蠕變參數。3、將隧道圍巖視為蠕變介質,且符合Buegers模型,將襯砌結構視為彈性體,利用“彈性—粘彈性”對應原理,推導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間變化的解析解,進一步根據隧道設計規(guī)范關于襯砌安全系數的規(guī)定,得到了襯砌安全系數的粘彈性解。4、利用“當量半徑法”將唐家塬隧道轉化為圓形隧道計算,得到了唐家塬隧道襯砌結構與圍巖相互作用力隨時間的變化規(guī)律,進一步分析襯砌安全系數,得到了唐家塬隧道襯砌結構安全系數在設計使用年限內的變化曲線。5、應用FLAC3D數值模擬軟件,對唐家塬隧道襯砌結構受圍巖蠕變作用下的應力分布及變化特點進行了模擬。得到了相關結論:在隧道完成施工后的前10年中,隧道襯砌結構受到圍巖蠕變特性影響相對明顯,而在隨后的10至40年內應力逐漸調整,之后是相對穩(wěn)定階段,雖然襯砌應力仍在增大,但增大速度很小。6、對比分析了隧道襯砌結構各特征點處圍巖壓力以及安全系數的理論值和模擬值,結果表明理論值與模擬值雖然存在一定的差別,但其變化趨勢和變化范圍大體相當,證明了理論計算的適用性,并對實際工程具有一定的指導意義。
[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.

【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U451

【參考文獻】

相關期刊論文 前10條

1 楊軍義;段亞輝;楊舒涵;;烏東德水電站左岸導流洞K1+415斷面圍巖蠕變參數反演分析[J];中國水運(下半月);2016年05期

2 朱昌星;黃增慧;韓憲軍;;基于三軸蠕變試驗砂巖非線性蠕變模型研究[J];河南理工大學學報(自然科學版);2015年04期

3 何以群;;隧道時效大變形災害的數值模擬與處治技術研究[J];長春工程學院學報(自然科學版);2015年02期

4 陳峰;;基于單純形—有限元耦合算法的隧道圍巖蠕變參數反演[J];國防交通工程與技術;2015年02期

5 徐鵬;楊圣奇;;循環(huán)加卸載下煤的黏彈塑性蠕變本構關系研究[J];巖石力學與工程學報;2015年03期

6 馮研;袁勝洋;徐鵬;李安洪;蔣關魯;;成綿樂高速鐵路成都黏土地基蠕變參數反演及沉降預測[J];四川建筑科學研究;2014年05期

7 唐葭;鄧宗偉;蔣建清;;考慮蠕變影響的隧道圍巖抗力系數計算方法[J];中南大學學報(自然科學版);2014年04期

8 劉甲榮;郭洪;高智s，

本文編號：1459852