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作 者:刘烈帅 刘先林 邵羽 唐正辉 薛大为 吕玺琳[1,3] LIU Lieshuai;LIU Xianlin;SHAO Yu;TANG Zhenghui;XUE Dawei;LYU Xilin(College of Civil Engineering,Tongji University,Shanghai 200092,China;Guangxi Communications Design Group Co.,Ltd.,Nanning 530029,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China)
机构地区:[1]同济大学土木工程学院,上海200092 [2]广西交通设计集团有限公司,广西南宁530029 [3]同济大学岩土及地下工程教育部重点实验室,上海200092
出 处:《广西大学学报(自然科学版)》2024年第6期1204-1215,共12页Journal of Guangxi University(Natural Science Edition)
基 金:广西科技重大专项(AA2302318);广西南宁市“邕江计划”青年人才专项项目(RC20230108)。
摘 要:通过开展不同围压条件下三轴压缩试验,研究了天然含水与饱和状态下中风化砂岩的静力学特性,探讨了试样从天然含水到饱和的状态变化对其强度参数、峰值应力、峰值应变及弹性模量的影响规律。试验结果表明,当中风化砂岩试样从天然含水状态转变为饱和状态时,其峰值应力和峰值应变降低,但弹性模量几乎无变化。基于侧向应变响应(LSR)法,通过测量试样体应变最大时的应力值,确定了天然含水及饱和状态下中风化岩石的裂纹损伤应力。分析表明砂岩试样裂纹损伤应力约为起裂应力的2倍,且为峰值应力的60%~95%。随着围压增大,砂岩破坏后的主裂隙逐渐从竖向分布转变为水平向分布。This paper investigates the mechanical properties of natural moist and saturated moderately weathered sandstone through triaxial compression tests.The study analyzes the effects of transitioning from a natural moist state to a saturated state on key parameters such as sample strength,peak stress,peak strain,and elastic modulus.The experimental results indicate that when the sample changes from a natural to a saturated state,both peak stress and peak strain decrease,while the elastic modulus remains unchanged.Using the lateral strain response(LSR)method,the stress value associated with crack propagation in both natural and saturated moderately weathered sandstone samples is determined by measuring the stress magnitude at maximum volumetric strain.The stress associated with crack propagation is found to be approximately twice that corresponding to crack initiation and ranges between 60%and 95%times the peak stress.Additionally,as confining pressure increases,the primary fracture orientation during the post-failure stage shifts from vertical to horizontal.
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