珊瑚礁岩土材料的物理力学性能研究综述
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摘要
为了更深入地了解珊瑚礁灰岩和钙质砂的物理和力学特性,该文通过总结近年来的相关文献,对珊瑚礁的形成机理及其分布区域,珊瑚礁灰岩和钙质砂两种典型珊瑚礁岩土材料的物理力学特性做出了详细的阐述;着重论述了钙质砂的压缩特性、剪切特性、破碎特性、动力特性、钙质砂混凝土和桩基工程特性及钙质砂数学物理模型几个方面的研究进展.分析表明:钙质砂具有丰富内孔隙、胶结、颗粒破碎三个重要的结构特征,其静力学和动力学特性与其结构特性密切相关;颗粒破碎对钙质砂的变形和强度特性存在十分显著的影响,尤其表现在高应力水平条件下;已有的数学物理模型多关注其胶结和颗粒破碎特性,但难以定量地从微观层面描述钙质砂力学特性的演化;如何通过宏微观表征相结合的方法,建立起钙质砂微观特性和宏观特性之间的关联,并以此为基础构建数学物理模型,进而为发展珊瑚礁岩土力学理论和模型提供了新的研究视角.
In order to have a more profound understand of the physical and mechanical properties of coral reef limestone and calcareous sand,the formation mechanism of coral reefs and their distribution areas as well as the physical and mechanical properties of two typical coral reef rock and soil materials,i.e.,coral reef limestone and calcareous sand were reviewed in details based on the relevant literature in recent years,particularly for the research progresses on the compressive properties,shear properties,crushing properties,dynamic properties,concrete engineering,pile foundation engineering and mathematical physical model of calcareous sands.The result shows that:Calcareous sand has three important structural characteristics of high void ratio,cementation and particle breakage,its static and dynamic characteristics are closely related to structural characteristics;Particle crushing has a very significant influence on the deformation and strength characteristics of calcareous sand,especially in the condition of high stress levels;The existing mathematical physical models pay more attention to characteristics of cementation and particle breakage,but these models are difficult to quantitatively describe the evolution of mechanical properties from the microscopic level;How to establish a mathematical physical model based on the combination of macro and micro characterization and the relationship between the microcosmic and macro characteristics of calcareous sand,and to provide a new perspective for the development of the theory and model of the coral reef rock and soil mechanics.
In order to have a more profound understand of the physical and mechanical properties of coral reef limestone and calcareous sand,the formation mechanism of coral reefs and their distribution areas as well as the physical and mechanical properties of two typical coral reef rock and soil materials,i.e.,coral reef limestone and calcareous sand were reviewed in details based on the relevant literature in recent years,particularly for the research progresses on the compressive properties,shear properties,crushing properties,dynamic properties,concrete engineering,pile foundation engineering and mathematical physical model of calcareous sands.The result shows that:Calcareous sand has three important structural characteristics of high void ratio,cementation and particle breakage,its static and dynamic characteristics are closely related to structural characteristics;Particle crushing has a very significant influence on the deformation and strength characteristics of calcareous sand,especially in the condition of high stress levels;The existing mathematical physical models pay more attention to characteristics of cementation and particle breakage,but these models are difficult to quantitatively describe the evolution of mechanical properties from the microscopic level;How to establish a mathematical physical model based on the combination of macro and micro characterization and the relationship between the microcosmic and macro characteristics of calcareous sand,and to provide a new perspective for the development of the theory and model of the coral reef rock and soil mechanics.
引文
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