土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (2): 173-177.

• 工程实录 • 上一篇    下一篇

沿海快速成陆场地预处理效果评价研究

马忠武1，胡 波2，李 波2   

  1. （1.中信清水入江（武汉）投资建设有限公司，武汉 430200；2.长江科学院，水利部岩土力学与工程重点实验室，武汉 430010)
  • 收稿日期:2021-11-29 修回日期:2021-12-30 出版日期:2022-04-30 发布日期:2022-04-27
  • 作者简介:马忠武（1985-），男，硕士，高工，研究方向为设计、项目管理等。

Evaluation of Coastal Rapid Land Reclamation Pretreatment Results

MA Zhongwu1, HU Bo2, LI Bo2   

  1. (1.CITIC Treated Water into River Engineering & Investment Co. Ltd., Wuhan 430200;
    2.Key Laboratory for Geotechnics and Geotechnical Engineering of Water Resources Ministry, 
    Yangtze River Scientific Research Institute, Wuhan 430010)
  • Received:2021-11-29 Revised:2021-12-30 Online:2022-04-30 Published:2022-04-27

摘要： 基于沿海某石化基地快速成陆场地工程，通过对比分析地基预处理前后土性参数进行地基预处理效果评价。工程现场地质条件复杂，淤泥层深厚且不均匀，采用塑料排水板+堆载预压方案进行场地预处理。预处理效果评价采用现场取样开展室内物理力学参数试验和现场试样相结合的方法，室内试验主要对比分析孔隙比、压缩系数、压缩模量等，现场试验主要包括标准贯入试验、静力触探试验、十字板剪切试验和扁铲试验等现场原位测试方法。结果表明：场地软土层主要为淤泥质黏土层，预处理后孔隙比明显减小，平均降幅为24.6%，而压缩系数显著降低，平均降幅为23.7%，压缩模量平均增大5.5倍；现场原位测试结果表明地基土强度有较大提高，平均增幅为4.1倍、3.9倍和1.26倍。

关键词: 软土地基, 场地预处理, 塑料排水板, 堆载预压, 效果评价

Abstract: This paper presents a case history of a comparative evaluation of soil properties before and after the pretreatment of a fast land reclamation site for a petroleum project site in the coastal area. The pre-fabricated vertical drain with surcharging preloading method was used as the pretreatment method in this soft soil site with thick and un-even thickness peaty soils. The soil improvement results were evaluated by the in-situ tests and laboratory tests on samples collected from the site before and after the pretreatment. The laboratory test items included, void ratio, coefficient of compression and compression modulus and the in-situ testing methods are, Standard Penetration Tests (SPT), Cone Penetration Tests (CPT) value shear test and dilatometer test. The results indicate that the site predominantly consists of peaty clayey soils and the void ratio in the cohesive soils reduced significantly after the pretreatment with an average reduction of 24.6%. The coefficient of compression has an average reduction of 23.7%. The modulus of compression has an average increase of 5.5 times. The in-situ test results also indicate that the shear strength of the subsurface soil has a significant increase, at various locations, these increase are, 4.1, 3.9 and 1.29 time, respectively.

Key words: soft ground, site pretreatment, insitu testing, prefabricated vertical drain method, effect evaluation

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