长江科学院院报 ›› 2018, Vol. 35 ›› Issue (1): 101-106.DOI: 10.11988/ckyyb.20160804

• 岩土工程 • 上一篇    下一篇

基于正交试验法的重力锚基坑岩土参数敏感性分析

冉涛1, 毛江南2, 梅松华3, 王巍伟4, 谭利华4   

  1. 1.中国科学院 地质与地球物理研究所,北京 100029;
    2.重庆市交通委员会工程质量安全监督局,重庆 400060;
    3.中国电建集团 中南勘测设计研究院有限公司,长沙 410014;
    4.中交一公局驸马长江大桥一分部,重庆 万州 404000
  • 收稿日期:2016-08-10 出版日期:2018-01-01 发布日期:2018-01-11
  • 作者简介:冉 涛(1985-),男,四川广元人,博士研究生,主要从事工程地质和岩土工程方面的研究。E-mail:rantaopaul@aliyun.com

Sensitivity Analysis of Rock-Soil Parameters of a Gravity Anchor

Excavation Based on Orthogonal Experiment MethodRAN Tao1,MAO Jiang-nan2, MEI Song-hua3,WANG Wei-wei4,TAN Li-hua4   

  1. 1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
    2.Engineering Quality and Safety Supervision Bureau of Chongqing Traffic Committee, Chongqing 400060,China;
    3.Zhongnan Engineering Co. Ltd., Power China, Changsha 410014, China;
    4.First Division of FumaYangtze River Bridge, China First Highway Engineering Co. Ltd., Wanzhou 404000, China
  • Received:2016-08-10 Online:2018-01-01 Published:2018-01-11

摘要: 为了探究重力锚基坑变形过程中的岩土参数敏感性,以重庆万州驸马长江大桥北岸重力锚基坑作为研究对象,首先基于正交试验法设计计算方案,采用有限差分软件FLAC3D对基坑开挖变形进行数值计算。然后对计算结果进行极差分析和方差分析。结果表明:极差分析和方差分析识别出的影响基坑开挖变形的主要岩土参数均为全风化层的弹性模量E1、泊松比μ1、黏聚力c1、内摩擦角φ1以及强风化层的弹性模量E2;结合基坑开挖试算结果综合确定的反演目标参数为全、强风化层的弹性模量E1E2。研究结果为后续的位移反分析奠定了基础,以及为控制基坑开挖变形提供了施工指导建议,同时还为类似工程的敏感性分析问题提供了借鉴方法。

关键词: 深基坑工程, 敏感性分析, 岩土参数, 正交试验法, 统计分析

Abstract: In the aim of investigating the sensitivity of rock-soil parameters during the deformation of gravity anchor excavation, FLAC3D was employed to simulate the deformation based on orthogonal experiment design, and range analysis and variance analysis were conducted for the simulation results. The gravity anchor excavation of Fuma Yangtze River Brideg in Wanzhou District, Chongqing City, was selected as the research object. Results of range analysis and variance analysis both suggest that elastic modulus E1, poisson’s ratio μ1, cohesion c1, and internal friction angle φ1 of completely-weathered layer and elastic modulus E2 of strongly-weathered sandy mudstone were identified as the dominant geotechnical parameters that affect the deformation of excavation. Furthermore in association with trial calculation results, E1 and E2 were determined as the target parameters of inversion analysis. The research results laid a foundation for subsequent displacement back analysis, provided guiding suggestion for controlling the deformation of excavation, and offered a reference for sensitivity analysis of similar engineering as well.

Key words: deep excavation project, sensitivity analysis, rock-soil parameters, orthogonal experiment method, statistical analysis

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