摘要
为探究循环预剪对饱和粉土力学性质的影响,本文系统开展了多循环加载历史对饱和粉土不排水剪切特性影响的试验研究。利用空心圆柱扭剪仪,针对饱和粉土(Dr=50%)进行了不同循环应力比和循环加载方式的循环预剪和二次固结静剪试验。试验结果发现:随着液化水平的提高,饱和粉土重固结所产生的体应变逐渐增大,应变硬化逐渐增强,相变强度SPT逐渐提高,但相变有效内摩擦角变化不大。在围压不变的前提下,体应变、应力应变关系、有效应力路径、相变强度SPT以及相变有效内摩擦角几乎与前期加载的循环应力比和循环加载方式无关。本文研究对粉土地区的工程建设具有实际参考价值。
This study investigated the effects of cyclic preshearing on the undrained mechanical properties of saturated silt, considering different cyclic loading histories. Cyclic preshearing and secondary consolidation static shear tests were performed on saturated silt(D_r=50%) subject to different cyclic stress ratios and cyclic loading manners by utilizing a GDS hollow cylinder torsional shear apparatus. Testing results indicate that with the rise of liquefaction level, the volumetric strain generated from the reconsolidation of saturated silt increases gradually, stress hardening enhances gradually, and the strength of phase transition SPT increases gradually. However, the effective internal friction angle shows no significant change. Under a constant confining pressure, the shearing features, such as volumetric strain, stress-strain relationship, effective stress path, strength of phase transition SPT, and effective internal friction angle of the phase transition, show no correlation with the prior cyclic stress ratio and cyclic loading patterns. This study has practical significance to engineering construction in silty areas.
作者
赵凯
蒋鹏程
秦悠
吴琪
陈国兴
ZHAO Kai;JIANG Pengcheng;QIN You;WU Qi;CHEN Guoxing(Institute of Geotechnical Engineering, Nanjing Technology University, Nanjing 210009, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2020年第8期1184-1189,共6页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51978335,51608267)
国家重点研发计划(2017YFC1500400).
关键词
循环预剪
饱和粉土
不排水单调剪切特性
相变强度
液化水平
循环加载方式
cyclic preshearing
saturated silt
undrained monotonic shearing behavior
strength of phase transition
liquefaction level
cyclic loading patterns
作者简介
通讯作者:赵凯,男,副教授,博士,E-mail:zhaokai@njtech.edu.cn.
