JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2018, Vol. 35 ›› Issue (1): 101-106.DOI: 10.11988/ckyyb.20160804

• ROCK-SOIL ENGINEERING • Previous Articles     Next Articles

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

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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