基于“承载复合体”的隧道位移反分析研究
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摘要
初期支护与松动圈围岩的协调作用表现出很大的不确定性,其主要影响因素包括:初期支护施工本身导致初期支护的不均匀性,实际围岩的不确定性对初期支护的影响,围岩释放应力的不均匀性导致的初期支护内力分布的不确定性。文章把初期支护的支护和围岩自身自稳能力看成是双介质的"承载复合体",采用最小二乘法建立目标函数,结合单纯形算法,进行初期支护与扰动区的联合位移反分析,充分揭示了初期支护与围岩松动圈之间的协调作用;结合实际工程与不考虑初期支护不确定性因素影响的反演分析进行对比,结果显示本文方法反演精度提高39%,预测精度提高了13%。
The coordinating function between the primary supporting and the broken rock has the prominent character of uncertainty.The main effecting factors are as follows: the non-uniformity of primary supporting coming from the construction,the effect coming from the uncertainty of actual surrounding rock,the uncertainty of internal force distribution in primary supporting coming from the non-uniformity of releasing stress on surrounding rock.The retaining of primary supporting and the self-stabilization capability of rock are regarded as a dual-media(i.e.,the bearing complex model).The displacement objective function is constructed by the least square formulas.Combining with the optimization method of simplex,the model with the "bearing complex" is applied to back-analysis of road tunnel.The results reveal the coordinating function between the primary supporting and the broken rock zone.In contrasts to the inversion result without considering the uncertainty of the primary supporting,the accuracy of inversion is improved 39% and the accuracy of prediction is improved 13%.Thus,The proposed method and the results can be used as reference to the construction and design of road tunnel with similar conditions.
The coordinating function between the primary supporting and the broken rock has the prominent character of uncertainty.The main effecting factors are as follows: the non-uniformity of primary supporting coming from the construction,the effect coming from the uncertainty of actual surrounding rock,the uncertainty of internal force distribution in primary supporting coming from the non-uniformity of releasing stress on surrounding rock.The retaining of primary supporting and the self-stabilization capability of rock are regarded as a dual-media(i.e.,the bearing complex model).The displacement objective function is constructed by the least square formulas.Combining with the optimization method of simplex,the model with the "bearing complex" is applied to back-analysis of road tunnel.The results reveal the coordinating function between the primary supporting and the broken rock zone.In contrasts to the inversion result without considering the uncertainty of the primary supporting,the accuracy of inversion is improved 39% and the accuracy of prediction is improved 13%.Thus,The proposed method and the results can be used as reference to the construction and design of road tunnel with similar conditions.
引文
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[3]杨志法,王思敬,冯紫良,等.岩土工程反分析原理及应用[M].北京:地震出版社,2002.Yang Zhifa,Wang Sijing,Feng Ziliang,et al..Principle of back a-nalysis and its application to geotechnical engineering.Beijing:Earthquake Press,2002.
[4]于德海,彭建兵,等.地下洞室动态开挖的三维数值分析及优化研究[J].工程地质学报,2005,13(4):502~507.Yu Dehai,Peng Jianbing,et al..Three dimensional numerical a-nalysis and optimization of dynamic excavation of an undergroundcavern.Journal of Engineering Geology,2005,13(4):502~507.
[5]陈建勋,欧阳院平,王明年.公路隧道复合式衬砌结构数值计算及分析[J].中国公路学报,2006,19(2):74~79.Chen Jianxun,Ouyang Yuanping,Wang Mingnian.Numerical com-puting and analysis of highway tunnel composite lining structure.China Journal of Highway and Transport,2006,19(2):74~79.
[6]李树清,王卫军,潘长良.深部巷道围岩承载结构的数值分析[J].岩土工程学报,2006,28(3):377~381.Li Shuqing,Wang Weijun,Pan Changliang.Numerical analysison support structure of rock around deep roadway.Chinese Journalof Geotechnical Engineering,2006,28(3):377~381.
[7]重庆交通科研设计院.公路隧道设计规范(JTG D70-2004)[S].北京:人民交通出版社,2004.Chongqing Communications Research and Design Institute.Speci-fications for design of highway tunnel(JTG D70-2004).Beijin:China Communications Press,2004.
[8]朱维申,李术才,白世伟.施工过程力学原理的若干发展和工程实例分析[J].岩石力学与工程学报,2003,22(10):1586~1591.Zhu Weishen,Li Shucai1,Bai Shiwei.Some developments of prin-ciples for construction process mechanics and some case historystudies.Chinese Journal of Rock Mechanics and Engineering,2003,22(10):1586~1591.
[9]刘金龙,栾茂田,许成顺.Drucker-Prager准则参数特性分析[J].岩石力学与工程学报,2006,25(Z2):4009~4014.Liu Jinlong,Luan Maotian,Xu Chengshun.Study on parametriccharacters of drucker-prager criterion.Chinese Journal of RockMechanics and Engineering,2006,25(Z2):4009~4014.
[10]王戍平.破碎围岩隧道的模拟试验研究[D].浙江大学,2004.Shu Pingwang.Model test study on the tunnel within cracked sur-rounding rocks.Zhe Jiang:Zhejiang University in China,2004.
[11]魏新江.浅理软弱围岩隧道地表锚固处理分析研究[D].浙江:浙江大学,2000.Wei Xingjiang.Analysis on anchor reinforcement construction ofground surface of shallow buried tunnel.Zhejiang:Zhejiang Uni-versity in China,2003.
[12]郑颖人,沈珠江,龚晓南.岩土塑性力学原理[M].北京:中国建筑工业出版社,2002.Zheng Yingren,Shen Zhujiang,Gong Xiaonan.Principle of plas-tic mechanics for tock and doil.Beijing:China Architecture andBuilding Press,2002.
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