岩土力学 ›› 2020, Vol. 41 ›› Issue (1): 185-193.doi: 10.16285/j.rsm.2018.2192

• 基础理论与实验研究 • 上一篇    下一篇

增压式真空预压吹填淤泥孔压 实时响应及加固机制初探

史吏1,胡东东1,蔡袁强1,潘晓东1,孙宏磊2   

  1. 1. 浙江工业大学 建筑工程学院,浙江 杭州 310014;2. 浙江大学 建筑工程学院,浙江 杭州 310058
  • 收稿日期:2018-12-03 修回日期:2019-05-14 出版日期:2020-01-13 发布日期:2020-01-05
  • 作者简介:史吏,男,1987年生,博士,副教授,主要从事岩土工程等方面的研究工作。
  • 基金资助:
    国家重点研发计划(No.2016YFC0800200);国家自然科学基金(No.51620105008,No.51608482,No.51879234);浙江省重点研发计划(No.2018C03038)

Preliminary study of real-time pore water pressure response and reinforcement mechanism of air-booster vacuum preloading treated dredged slurry

SHI Li1, HU Dong-dong1, CAI Yuan-qiang1, PAN Xiao-dong1, SUN Hong-lei2   

  1. 1. Department of Architecture Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China; 2. Department of Architecture Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China
  • Received:2018-12-03 Revised:2019-05-14 Online:2020-01-13 Published:2020-01-05
  • About author:SHI Li, male, (1987-), PhD, associate Professor, Research interest: geotechnical engineering.
  • Supported by:
    This work was supported by the National Key R&D Program of China (2016YFC0800200), the National Natural Science Foundation of China (51620105008, 51608482, 51879234) and the Key R&D Program of Zhejiang Province(2018C03038).

摘要: 进行了增压式真空预压处理吹填淤泥的室内模型试验,利用沉降标、微型孔压计和微型十字板剪切仪对试验过程中的土体沉降量、孔压消散以及强度进行监测。结果表明,土体内部注气增压对土体沉降量、孔压累积消散量以及强度提升均有明显促进作用。特别地,获得了增压期间土体孔压的实时响应,并结合数值模拟分析,推断了增压提升淤泥地基处理效果的主要机制为:注气引起增压管/排水板之间土体产生微小的劈裂裂缝,提高了土体的渗透性,并且该裂缝在增压结束后继续提供额外的排水通道,从而在增压后仍能加快孔压消散和土体固结。

关键词: 增压, 真空预压, 加固效果, 加固机制

Abstract: Laboratory tests have been carried out for simulating dredged-slurry treatment combining air-booster and conventional vacuum preloading methods. Settlement plate, micro pore water pressure transducer and miniature vane shearing instrument are adopted for monitoring the settlement, the pore pressure dissipation and the soil strength during the test. The test results demonstrate that the air-booster vacuum-preloading method can significantly improve the soil strength, pore-water pressure dissipation and settlement. In particular, the real-time responses of pore-water pressure during the air-pressurizing process have been obtained that, in combination with the numerical simulations, help derive the reinforcement mechanism of the air-booster vacuum preloading method, which involves using micro cracks generated by splitting soil between the booster tube and PVD using the pressurised air. Those cracks improve the soil permeability, and have lasting effect even after air pressuring ceased.

Key words: air pressurizing, vacuum preloading, reinforcement effect, reinforcement mechanism

中图分类号: 

  • TU 470
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