西南山区机场高填方边坡反压护道优化设计
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摘要
针对西南山区机场高填方地基存在有限深度相对软弱土层的工程地质情况,提出单级反压护道的优化设计方法及优化设计中所涉及到的各类典型滑移面稳定安全系数的简化计算方法,并对其进行了证明及验证,分析了所提方法计算结果与强度折减有限元法的差别大小及方法的适用性。验证结果表明:所提方法计算的安全系数与有限元计算结果的相对误差均不超过12%;计算的反压护道断面尺寸相对误差不超过20%;应用于有硬壳层的工程地质条件或有反压护道的典型滑移面时,误差更小。
Aiming at the special engineering geology condition in the southwest mountainous area,where there is relatively soft soil with a finite thickness,an optimization design method for a single step loading berm is put forward.Simplified calculation methods of safety factors of various typical sliding surfaces,involved in the optimization design,are also proposed.Furthermore,the optimization design method and simplified calculation methods are proved and verified.Finally,the errors and applicability of the proposed methods are discussed.The verification results show that the relative errors of the methods,put forward to calculate the safety factor or size of the loading berm,are no more than 12% to 20% compared with the finite element method.Moreover,when applying the methods to the engineering geology condition with hard crust or typical sliding surface with loading berm,the relative errors of the methods are smaller than those under ordinary conditions.
Aiming at the special engineering geology condition in the southwest mountainous area,where there is relatively soft soil with a finite thickness,an optimization design method for a single step loading berm is put forward.Simplified calculation methods of safety factors of various typical sliding surfaces,involved in the optimization design,are also proposed.Furthermore,the optimization design method and simplified calculation methods are proved and verified.Finally,the errors and applicability of the proposed methods are discussed.The verification results show that the relative errors of the methods,put forward to calculate the safety factor or size of the loading berm,are no more than 12% to 20% compared with the finite element method.Moreover,when applying the methods to the engineering geology condition with hard crust or typical sliding surface with loading berm,the relative errors of the methods are smaller than those under ordinary conditions.
引文
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[2]刘桂琴,王子玉,高振鲲.贵州某高填方滑塌变形监测分析[J].人民长江,2007,38(11):146―147.Liu Guiqin,Wang Ziyu,Gao Zhenkun.Deformationmonitoring analysis for slumping of certain high fill inGuizhou[J].Yangtze River,2007,38(11):146―147.(inChinese)
[3]郑刚,陈红庆,雷扬,等.基坑开挖反压土作用机制及其简化分析方法研究[J].岩土力学,2007,28(6):1161―1166.Zheng Gang,Chen Hongqing,Lei Yang,et al.A study ofmechanism of earth bean and simplified analysis methodfor excavation[J].Rock and Soil Mechanics,2007,28(6):1161―1166.(in Chinese)
[4]Roy D,Singh R.Mechanically stabilized earth wallfailure at two soft and sensitive soil sites[J].Journal ofPerformance of Constructed Facilities,2008,22(6):373―380.
[5]王晓谋,袁怀宇.高等级公路软土地基路堤设计与施工技术[M].北京:人民交通出版社,2001.Wang Xiaomou,Yuan Huaiyu.Design of subgrade ofsoft soil and construction technology for highway[M].Beijing:China Communications Press,2001.(inChinese)
[6]沈细中,沈华中,刘隆斌,等.基于遗传算法的堤坝反压优化设计[J].长江科学院院报,2003,20(4):35―38.Shen Xizhong,Shen Huazhong,Liu Longbin,et al.Optimizing anti-press design of dike and dam based ongenetic algorithm[J].Journal of Yangtze River ScientificResearch Institute,2003,20(4):35―38.(in Chinese)
[7]常士骠,张苏民.工程地质手册[M].第4版.北京:中国建筑工业出版社,2007.Chang Shipiao,Zhang Sumin.Engineering geologyhandbook[M].4th ed.Beijing:China Architecture&Building Press,2007.(in Chinese)
[8]中国建筑西南勘察设计研究院.昆明新机场飞行区填方区岩土工程详细勘察报告(总报告)[R].成都:中国建筑西南勘察设计研究院,2008.China Southwest Geotechnical Investigation andBuilding Design Institute.Report on detailed geologicalinvestigation for filled area of Kunming new airportflight area(General report)[R].Chengdu:ChinaSouthwest Geotechnical Investigation and BuildingDesign Institute,2008.(in Chinese)
[9]田景富.康定机场高填方地基填料特性与变形研究[D].贵阳:贵州大学,2007.Tian Jingfu.A research on the engineering properties ofthe packed moraine materials and the deformation&settlement of high embankment of Kangding Airport,Sichuan China[D].Guiyang:Guizhou University,2007.(in Chinese)
[10]陈仲颐,周景星,王洪瑾.土力学[M].北京:清华大学出版社,1994.Chen Zhongyi,Zhou Jingxing,Wang Hongjin.Soilmechanics[M].Beijing:Tsinghua University Press,1994.(in Chinese)
[11]丁金粟,李锦坤,虞石民,等.土力学及基础工程[M].北京:地震出版社,1992.Ding Jinsu,Li Jinkun,Yu Shimin,et al.Soil mechanicsand foundation engineering[M].Beijing:Seismological Press,1992.(in Chinese)
[12]刘建航,侯学渊.基坑工程手册[M].北京:中国建筑工业出版社,1997.Liu Jianhang,Hou Xueyuan.Handbook of deepexcavation engineering[M].Beijing:China Architectureand Building Press,1997.(in Chinese)
[13]中国民航机场建设集团公司.昆明新机场工程项目全场地基处理与土石方工程设计说明及施工技术要求[M].北京:中国民航机场建设集团公司,2008.China Airport Construction Group Corporation of CAAC.Design specification of full-court ground treatment andearthwork as well as the requirement of constructiontechnique of Kunming new airport engineering project[M].Beijing:China Airport Construction GroupCorporation of CAAC,2008.(in Chinese)
[14]水利部长江水利委员会长江科学院,民航新时代机场设计研究院有限公司.昆明新机场岩土工程试验研究报告(西试验区地基处理与土石方填筑部分)[R].武汉:水利部长江水利委员会长江科学院,2007.Yangtze River Scientific Research Institute of YangtzeRiver Water Resources Commission of Ministry ofWater Resources,CAAC New Era Airport Design&Research Institute Company.Experimental researchreport on geological engineering of Kunming new airport(Division of ground treatment and earthwork fill of westtest sit)[R].Wuhan:Yangtze River Scientific ResearchInstitute of Yangtze River Water Resources Commissionof Ministry of Water Resources,2007.(in Chinese)
[15]宋二祥.土工结构安全系数的有限元计算[J].岩土工程学报,1997,19(2):1―7.Song Erxiang.Finite element analysis of safety factor forsoil structures[J].Chinese Journal of GeotechnicalEngineering,1997,19(2):1―7.(in Chinese)
[16]张鲁渝,郑颖人,赵尚毅,等.有限元强度折减系数法计算土坡稳定安全系数的精度研究[J].水利学报,2003,34(1):21―27.Zhang Luyu,Zheng Yingren,Zhao Shangyi,et al.Thefeasibility study of strength-reduction method with FEMfor calculating safety factors of soil slope stability[J].Journal of Hydraulic Engineering,2003,34(1):21―27.(in Chinese)
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