摘要
静力触探试验(CPT)及孔压静力触探试验(CPTU)是场地土层参数测定的重要方法,能够获得连续且可靠的数据。海洋沉积物受不同水流速度和悬浮沉积物的影响,通常形成由粉砂、淤泥或两者混合而成的层状地层。即使是较薄的土层也会显著影响海洋沉积物在荷载作用下的整体渗透性和固结程度。尽管许多学者通过室内试验和数值方法研究了均匀混合粉砂的特性,但对异质混合粉砂的特性了解仍然不足。本文综述了CPT和CPTU的应用研究,指出了目前研究层状海洋土壤存在的问题与挑战。内容包括中层土壤的排水条件、标准化圆锥贯入参数以及土壤层状结构对孔隙压力响应的影响。综述还指出了目前存在的研究空白,例如对薄层土壤中圆锥周围水流机制的理解需进一步加强,以及缺乏分析异质混合海洋粉砂的综合框架。通过完善这些不足,未来的研究可以提高CPT和CPTU在测试复杂海洋土壤沉积物特性时的准确性和可靠性。
The cone penetration test(CPT)and its variant with pore water pressure measurement(CPTU)are essential tools for site characterization,providing continuous,repeatable,and reliable data.Marine deposits,influenced by varying water velocities and suspended sediments,often form layered strata of silts,sands,or a mix of both.Even thin layers can significantly affect the overall permeability and degree of consolidation of marine deposits under loading.While many studies have investigated the behavior of uniformly mixed silts using laboratory and numerical methods,the behavior of heterogeneously mixed silts remains less understood.This review highlights research on CPT and CPTU applications,emphasizing the challenges of interpreting data from layered marine soils.It covers key findings on the drainage conditions of intermediate soils,normalized cone penetration parameters,and the impact of soil layering on pore water pressure responses.The review also identifies significant research gaps,such as the need for a better understanding of water flow mechanisms around the cone in thinly layered soils and the lack of a comprehensive framework for analyzing heterogeneously mixed marine silts.By addressing these gaps,future research can improve the accuracy and reliability of CPT and CPTU in characterizing complex marine soil deposits.
出处
《地基处理》
2024年第3期262-269,共8页
Journal of Ground Improvement
基金
National Key Research and Development Program(2018YFE0109500)
National Natural Science Foundation of China(51939010,51779221,U1806230)
Key Research and Development Program of Zhejiang Province(2018C03031).
