基于施工数据的水下深层水泥搅拌桩成桩质量影响因素分析

Analysis of influencing factors of underwater deep cement mixing pile’s quality based on construction data

随着信息化技术的发展,水下深层水泥搅拌桩(DCM)施工船舶具备了完善的自动化、信息化控制系统,并在施工过程中记录了大量的施工过程数据。绝大部分水泥土影响因素分析基于室内配合比试验数据或实际项目的设计参数及检测结果(即默认施工参数与设计参数保持一致)。但是,实际施工条件与室内条件并不一致,实际施工参数与设计参数也有差异。基于香港三跑水下DCM施工过程中实时记录的施工数据,统计检测桩在施工中的实际参数,结合勘察及土工试验成果,建立勘察-施工-检测的因果关系。通过统计分析影响不同土在不同深度成桩质量的主要因素,为实际施工参数控制提供依据。

With the development of information technology,the underwater deep cement mixing(DCM)pile construction ship has a perfect automation and information control system,which records a lot of data in the process of construction.At present,most of the analysis of cement soil’s influencing factors are based on the experiments in laboratory,or the design parameters and test results of the project(i.e.,the construction parameters are consistent with the design parameters).However,the actual construction conditions are not consistent with the laboratory conditions,and the actual construction parameters are also different from the design parameters.Based on the real-time data recorded in the construction process of the underwater DCM pile in the Hong Kong International Airport Third Runway Project and the statistical parameters of the tested piles during construction,and combining with the investigation and geotechnical test results,we establish the causal relationship between the investigation,construction and tests.Through the statistical analysis of the main factors that affect the quality of pile forming in different depth of different soil,we provide the basis for the actual construction parameter control.