石膏岩隧道衬砌支护设计方案优化研究
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摘要
在地下工程建设过程中常会遭遇到大量不良地质区段,尤其是石膏岩等软弱膨胀性岩层,会对隧道衬砌产生极大危害。为此,迫切需要进行石膏岩隧道衬砌支护优化设计研究,建立相关评价方法。建立了围岩和支护稳定性评价办法及衬砌结构安全性评价办法,衬砌结构安全性通过钢筋混凝土结构的强度安全系数进行评价,围岩与支护稳定性通过强度折减法的系数评价。并基于某特长隧道石膏岩段工程案例,模拟原支护方案并采用该评价方法对衬砌支护进行优化。运用该评价方法可指导设计和施工的进行,使设计方案的稳定性、可靠性得到定量分析和较为准确的评价。
In the process of underground engineering construction,a large number of unfavorable geological sections will be encountered. Especially the expansive rocks such as gypsum rock will cause great damage to the tunnel lining. Therefore,it is urgent to carry out the optimization design of the gypsum rock tunnel lining support and establish relevant evaluation methods.. The study established the evaluation method of surrounding rock and support stability and the safety evaluation method of lining structure. The safety of lining structure was evaluated by the strength safety factor of reinforced concrete structure,and the stability of surrounding rock and support was calculated by the factor evaluation of finite element strength reduction. Based on the case of a gypsum rock section of a special long tunnel,the working condition is simulated and the lining support is optimized by this evaluation method. The evaluation method can be used to guide the design and construction,so that the stability and reliability of the design scheme can be quantitatively analyzed and accurately evaluated.
In the process of underground engineering construction,a large number of unfavorable geological sections will be encountered. Especially the expansive rocks such as gypsum rock will cause great damage to the tunnel lining. Therefore,it is urgent to carry out the optimization design of the gypsum rock tunnel lining support and establish relevant evaluation methods.. The study established the evaluation method of surrounding rock and support stability and the safety evaluation method of lining structure. The safety of lining structure was evaluated by the strength safety factor of reinforced concrete structure,and the stability of surrounding rock and support was calculated by the factor evaluation of finite element strength reduction. Based on the case of a gypsum rock section of a special long tunnel,the working condition is simulated and the lining support is optimized by this evaluation method. The evaluation method can be used to guide the design and construction,so that the stability and reliability of the design scheme can be quantitatively analyzed and accurately evaluated.
引文
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[2]罗健.含膏岩系及其对隧道工程的影响[J].西南交通大学学报,1978(1):66-75.
[3]任松,周闽江,赵云峰,等.石膏岩隧道衬砌结构防腐技术试验研究[J].工业建筑,2018,48(10):142-147.
[4]吴银亮.石膏质岩工程地质特性及其对隧道混凝土结构危害机制研究[D].中国地质大学,2013.
[5]朱汉华,孙红月,杨建辉.公路隧道围岩稳定与支护技术[M].北京:科学出版社,2007.
[6]陈杨,袁长丰.基于R/S分析法的隧道围岩变形趋势分析[J].工程建设,2018,50(1):21-25.
[7]李雷,张慧,潘彩君.鹜窝梁隧道二次衬砌数值模拟及衬砌安全性分析[J].岩土工程界,2007(5):51-53.
[8]辜良仙.高地应力软岩大变形隧道变形控制技术研究[D].重庆:重庆交通大学,2017.
[9] JTG D70—2004,公路隧道设计规范[S].
[10]张黎明,郑颖人,王在泉,等.有限元强度折减法在公路隧道中的应用探讨[J].岩土力学,2007,28(1):98-10.
[11]郑颖人,赵尚毅,邓楚键,等.有限元极限分析法发展及其在岩土工程中的应用[J].中国工程科学,2006,12(12):40-61.
[12]郑颖人.有限元极限分析法在隧洞工程中的应用[J].重庆交通大学学报(自然科学版),2011(S2):1 128-1138.
[13]郑颖人,胡文清,王敬林.强度折减有限元法及其在隧道与地下洞室工程中的应用[A].中国土木工程学会第十一届.
[14]王冬林.基于安全系数法的地下洞室围岩稳定评价方法研究[D].杨凌:西北农林科技大学,2012.