Effects of temperatures and fines content on the shear properties of calcareous sand

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-09-29 DOI:10.1007/s10064-025-04480-z

Yang Wu, Ying Cai, Liwei Wen, Norimasa Yoshimoto, Caishun Meng, Jie Cui

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引用次数: 0

Abstract

Calcareous sand is regarded as one of the special marine deposits and widely adopted as dredged hydraulic filling materials for island reclamation. The deposited foundation probably contains a large amount of fine-grained sand due to hydraulic transportation. In offshore regions, the construction of geothermal infrastructures, such as oil pumps and platforms, is urgently needed in reclamation island regions. Therefore, the effects of temperature and fines content on the shear properties of calcareous sand requires further investigation. In this study, a series of temperature-controlled drained triaxial shear tests were carried out on calcareous sands containing various fines content. The measured results show that increasing temperature promotes the micro-expansion of particles and intensifies the amount of particle crushing. Increasing fines content leads to marked decrement in shear strength, suppressing the dilatancy behavior. The fine-grained particles play a lubricating role between neighboring grains and greatly change the effective contact mode. It is noted that both internal friction angle and the cohesion of calcareous sand-fines mixture also decrease with increasing temperature and fines content. A good relationship between peak mobilized friction angle\(\:\:{\:\phi\:}_{peak\:}\)and effective confining pressure \(\:{\sigma\:}_{c}^{{\prime\:}}\) for calcareous sand under different thermal loading paths is noticed. An emprical equation to estimate the peak mobilized friction angle \(\:{\:\phi\:}_{peak\:}\)for calcareous sand considering the combined influences of temperature, fines content and confining stress has been proposed. The predicted performance of the established model is satisfactory.

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温度和细粒含量对钙质砂剪切性能的影响

钙质砂是一种特殊的海相沉积物，被广泛用作填海造地的疏浚水力填筑材料。沉积的地基可能由于水力输送而含有大量细粒砂。在近海地区，填海造岛地区迫切需要建设地热基础设施，如油泵和平台。因此，温度和细粒含量对钙质砂剪切性能的影响有待进一步研究。本研究对不同细粒含量的钙质砂进行了一系列温控排水三轴剪切试验。实验结果表明，温度的升高促进了颗粒的微观膨胀，加大了颗粒的破碎量。细粒含量的增加导致抗剪强度显著降低，抑制了剪胀行为。细粒颗粒在相邻颗粒之间起润滑作用，极大地改变了有效接触方式。石灰质砂-细粒混合物的内摩擦角和黏聚力随温度和细粒含量的增加而减小。不同热加载路径下钙质砂的峰值动员摩擦角\(\:\:{\:\phi\:}_{peak\:}\)与有效围压\(\:{\sigma\:}_{c}^{{\prime\:}}\)之间存在良好的关系。提出了考虑温度、细粒含量和围应力综合影响的钙质砂峰值动员摩擦角\(\:{\:\phi\:}_{peak\:}\)经验方程。所建立的模型的预测性能令人满意。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.