干湿循环对自密实水泥土力学特性影响研究  

Experimental Study on Mechanical Properties of Self-compacting Cemented Soil Under Wet-Dry Cycles

作　　者：王迪[1] 王响 肖亮 万愉快 WANG Di;WANG Xiang;XIAO Liang;WAN Yukuai(College of Civil and Transportation Engineering,Hohai University,Nanjing,Jiangsu 210024,China;Department of Finance and Audit,Army Logistics Academy,Chongqing 401331,China;School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan,Ningxia 225008,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210024 [2]陆军勤务学院财务审计系,重庆401331 [3]宁夏大学土木与水利工程学院,宁夏银川225008

出　　处：《河北工程大学学报（自然科学版）》2024年第5期36-43,共8页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：宁夏自然科学基金资助项目(2023AAC03036)。

摘　　要：为了探究干湿循环对自密实水泥土力学性能的影响规律,通过试验对比分析了不同水泥掺量下的自密实水泥土在不同干湿循环次数下的无侧限抗压强度,探讨了自密实水泥土的外观破损程度和强度劣化规律,并根据强度衰减规律,建立循环次数与劣化后强度的经验公式。研究发现干湿循环作用下自密实水泥土第j次循环后的强度衰减率是第1次强度衰减率的j^(0.3)倍;自密实水泥土应力-应变曲线峰值强度会随着循环次数的增加逐渐降低,试样的破坏类型由脆性破坏变成塑性破坏。In order to explore the effect of dry-wet cycles on the mechanical properties of self-compacting soil-cement,the unconfined compressive strength of self-compacting cemented soil under different dry-wet cycles was compared and analyzed through experiments,and the appearance damage degree and strength deterioration law of self-compacting cemented soil were discussed.According to the strength decay law,an empirical formula between the dry-wet cycle number and strength deterioration was established.It is found that the strength decay rate of self-compacting cemented soil after the jth dry-wet cycles is j^(0.3)times that of the first cycle.The peak strength of the stress-strain curve of self-compacting cemented soil gradually decreases with the increase of the number of dry-wet cycles,and the failure type of sample changes from brittle failure to plastic failure.

关 键 词：自密实水泥土 干湿循环 水泥掺量 无侧限抗压强度 

分 类 号：TU528.53[建筑科学—建筑技术科学]