不同粒径钙质砂的侧限变形及内部应力演化  

Lateral deformation and internal stress evolution of calcareous sand with different particle sizes

作　　者：袁泉 施旭 高燕 江雨潮 孙乐 YUAN Quan;SHI Xu;GAO Yan;JIANG Yuchao;SUN Le(Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,China;School of Earth Sciences and Engineering,Sun Yat-sen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广东广州510010 [2]中山大学地球科学与工程学院,广东珠海510982 [3]南方海洋科学与工程广东省实验室(珠海),广东珠海510982

出　　处：《中山大学学报(自然科学版)(中英文)》2025年第2期1-11,共11页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(42072295);国家重点研发计划(2022YFC3005203)。

摘　　要：本文通过自设计的亚克力模型盒进行了不同粒径钙质砂侧限压缩与多级蠕变试验,探究了各级应力下不同粒径钙质砂的压缩变形、颗粒破碎特征及内部应力演化规律。研究表明:当竖向应力较低时,钙质砂压缩变形量、蠕变量及蠕变速率随颗粒粒径的增大而减小;当竖向应力较大时,钙质砂压缩变形量、蠕变量及蠕变速率随颗粒粒径的增大而增大。其原因为钙质砂的变形受钙质砂颗粒位置重排列与颗粒破碎共同控制。当竖向应力较小时,颗粒破碎不明显,可忽略不计,钙质砂粒径越大,颗粒形状越不规则,使得颗粒间的咬合力增加,抑制了变形的产生;随着竖向应力的增大,钙质砂发生显著的颗粒破碎,并且粒径越大,颗粒破碎越明显,加剧了变形的产生,并且引起颗粒间接触发生变化,加剧了应力重分布,钙质砂内部竖向及侧向应力大小的分布由Weibull转变到正态分布。蠕变过程中,钙质砂内部应力分布有均匀化趋势。In the study,lateral compression and creep tests were performed on calcareous sands of varying particle sizes using a self-designed acrylic model box.The research focused on investigating the compression deformation,characteristics of particle breakage,and the evolution of internal stress in calcareous sand under various stress levels.The results indicate that when vertical stress is relatively low,the compression deformation,creep strain,and creep rate of calcareous sand decrease as particle size increases.Conversely,under higher vertical stress,these variables increase with particle size.This behavior is attributed to the fact that the deformation of calcareous sand is controlled by the rearrangement of particle positions and the extent of particle breakage.At low vertical stress,particle breakage is minimal and can be overlooked;as the particle size of calcareous sand increases,the irregularity of particle shapes also increases,which enhances inter-particle locking and thus suppresses deformation.However,as vertical stress increases,considerable particle breakage occurs in calcareous sand;moreover,larger particle sizes lead to more significant particle breakage.This exacerbates deformation,alters the particle contacts,and intensifies stress redistribution.Consequently,the distribution of vertical and lateral stresses within the calcareous sand shifts from a Weibull distribution to a normal distribution.During the creep process,the internal stress distribution of calcareous sand tends to become uniform.

关 键 词：钙质砂 颗粒破碎 蠕变 颗粒粒径 应力分布 

分 类 号：TU41[建筑科学—岩土工程]