基于CPTU和MASW勘察信息融合的二维土性参数剖面贝叶斯表征方法  

A Bayesian Characterization Approach for 2D Profiles of Soil Properties Via Integrating Information from CPTU and MASW in Site Investigation

作　　者：郑栋[1,2,3,4] 李典庆 黄劲松[3] ZHENG Dong;LI Dianqing;HUANG Jinsong(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education,Wuhan University,Wuhan 430072,China;ARC Centre of Excellence for Geotechnical Science and Engineering,The University of Newcastle,Callaghan,NSW 2308,Australia;Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072 [3]纽卡斯尔大学澳大利亚研究委员会岩土工程科学智能与卓越中心,新南威尔士州卡拉汉2308 [4]长江勘测规划设计研究有限责任公司,湖北武汉430010

出　　处：《应用基础与工程科学学报》2021年第2期337-354,共18页Journal of Basic Science and Engineering

基　　金：国家重点研发计划项目(2017YFC1501301,2018YFC1508603);国家自然科学基金项目(51579190,51779189)。

摘　　要：静力触探试验(CPTU)和多通道表面波分析(MASW)是常用的场地勘察方法,有效利用上述两种试验数据以准确表征土性参数剖面是一个关键难题.本文提出了一种基于贝叶斯理论的岩土和地球物探测试数据融合方法.采用假设的算例验证所提方法,并进一步应用于澳大利亚Ballina试验场,用以融合勘察数据和表征土性参数剖面.结果表明,融合CPTU和MASW数据后的随机场剖面,可准确且详尽地提供参数在整个二维(2D)地下区域内的分布.当仅融合CPTU数据时,可估计未进行静力触探试验区域的土性参数,CPTU附近的土体剖面的局部不确定性得到降低;当同时融合1D的CPTU和2D的MASW数据后,表征的土性参数剖面与"真实"剖面吻合一致,且整体不确定性得到进一步降低.在Ballina试验场中,当融入更多的数据,2D随机场剖面的不确定性得以进一步降低,且有效识别出"软弱"区域.Piezocone penetration test(CPTU)and multichannel analysis of surface waves(MASW)are common methods for ground investigation.Integrating the data from the abovementioned two methods for accurate characterization of soil profiles is a critical and difficult issue.This paper proposes an approach for integrating the geotechnical and geophysical testing data based on Bayesian theory.The proposed approach is validated by a synthetic example,and is further applied to the Ballina site,Australia for integrating the site data and characterizing the profiles of soil properties.The results indicate that the updated random field after integrating the CPTU and MASW data provides an accurate and concise description of spatial distribution of the soil parameter throughout the two dimensional(2D)sub-region.When using the CPTU data only,the soil parameters at areas where CPTU is not performed can be inferred,and the local uncertainties of soil profiles near CPTU are reduced.When integrating the 1D CPTU and 2D MASW data,the characterized soil profile has good agreement with the"true"profile,and the uncertainties of soil profiles in the whole sub-region are further reduced.In the Ballina case,the uncertainties of 2D soil profiles are reduced when increasing the integrated site data,and the"weak"areas are effectively identified.

关 键 词：场地勘察 静力触探试验 表面波多通道分析 贝叶斯融合 二维剖面 空间变异性 

分 类 号：TU43[建筑科学—岩土工程]