国内外深层水泥搅拌桩质量评价对比分析

水泥搅拌桩(DCM)是一种常见的软基加固方法，国内在陆上应用成熟，并建立了完善的质量评价体系。近年来，我国水运工程向着大型化、深水化、高质量发展，多个重大项目成功应用水下DCM技术。由于DCM法在水下和陆上施工的装备、工艺、环境条件差异较大，直接将陆上的评价方法应用到水下，不一定能起到很好指导作用。结合中、日、美、欧关于DCM质量评价的相关规定进行对比分析，结果表明，水下DCM检测数量较多时，符合正态分布，可使用日本标准进行评价；国内JGJ 340—2015《建筑地基检测技术规范》以最小平均强度作为桩体强度代表值进行统计，而由于水下DCM桩桩径大，检测样本相对较少，统计意义不明显，不宜用于评价水下DCM复合地基质量。

Comparative analysis of quality evaluation of deep cement mixing piles in China and abroad

Deep cement mixing pile is a common method for reinforcing soft foundations.It has been used on land in China and a perfect quality evaluation system has been established.In recent years，China''s water transportation engineering has developed towards large-scale，deep-water and high-quality development，and the underwater DCM technology has been successfully applied to multiple major projects.Due to the significant differences in equipment，technology，and environmental conditions between underwater and land construction using DCM methods，directly applying land-based evaluation methods to underwater operations may not be effective.This paper compares and analyzes the relevant regulations on DCM quality evaluation in China，Japan，the United States and Europe，the results show that when the detection quantity of underwater DCM is large，the data follows a normal distribution，Japanese standards can be used for evaluation.The minimum average strength is used as the representative value of pile strength in the domestic JGJ 340—2015 Technical Code for Testing of Building Foundation.However，due to the large diameter of underwater DCM piles，the testing samples are relatively small and the statistical significance is not obvious，so it is not suitable for evaluating the quality of underwater DCM composite foundation.