| 汪海洋.水下DCM法加固软基关键参数优化[J].水运工程,2024,(12):238-244 |
| 水下DCM法加固软基关键参数优化 |
| Optimization on key parameters of soft foundation reinforcement by underwater DCM |
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| DOI： |
| 中文关键词: 深层水泥搅拌法 软基 施工参数 无侧限抗压强度 |
| 英文关键词:deep dement mixing soft foundation construction parameter unconfined compressive strength |
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| 中文摘要: |
| 陆上和水下软基深层水泥搅拌桩施工参数通常通过试桩确定，水下DCM多为四轴，施工参数难以确定。以某填海工程DCM桩为背景，对水下DCM桩进行试桩，对水泥搅拌桩搅拌切土次数、底部W施工曲线、喷浆工艺等关键参数进行研究，并通过三重管取芯对水泥土强度进行检测。结果表明，淤泥中水泥掺量由320 kg/m3优化为300 kg/m3，固化28 d水泥土搅拌桩无侧限抗压强度大于1.0 MPa，满足设计要求。底部硬黏土层增加2个小W施工曲线进行复搅可以提高水泥桩的强度。为充分将黏土搅散，下贯速度不宜大于0.3 m/min，提升速度不宜大于1.0 m/min。搅拌叶片的旋转速度应与钻头下贯或提升速度匹配，以提高搅拌效果，进而提高成桩质量。 |
| 英文摘要: |
| The construction parameters of deep cement mixing(DCM) on land and underwater soft foundation are usually determined by test pile,and the underwater DCM is mostly four-axis,so the construction parameters are difficult to determine.In this paper,the DCM piles in reclamation project is studied,the key parameters of the cement mixing pile,such as BRN,W-shaped construction curve at the bottom and cement slurry jet technology are studied,and the cement soil-cement strength is tested through triple tube coring.The results indicate that the cement content in the silt is optimized from 320 kg/m3 to 300 kg/m3,and the unconfined compressive strength of the cement-soil mixing pile is greater than 1.0 MPa after 28 days curing,which meets the design requirements.The pile’s strength can be improved by adding two W-shaped curve to remix the hard clay layer at the bottom.To fully stir the clay,the penetration speed should not be greater than 0.3 m/min and the withdraw speed should not be greater than 1.0 m/min.The stirring blade rotation speed should match the drill penetration or withdrawing speed to improve the mixing effect and the quality of pile. |
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