摘要
针对水利枢纽工程中场地土料填筑体力学特征,设计开展三轴试验研究,获得了围压、冻融循环次数对土料填筑体试样应力应变影响,围压促进土体加载应力一致性增长,但冻融循环次数对土体加载应力影响具有阶段性特征,循环0~10次时,冻融次数与加载应力为负相关,冻融增长2次,抗剪强度平均损耗22.2%,而超过10次后,又为正相关,循环增长2次,抗剪强度平均增长为42.7%。土体变形可分为“线弹性变形-塑性硬化变形”两阶段,且阶段临界拐点随围压增大而递增,但随冻融次数为先增后减变化;围压可促进线弹性模量增长,但冻融循环次数可促进塑性变形阶段变形模量增长。为水利工程中岩土体力学特性影响因素分析研究提供参考。
Aiming at the mechanical characteristics of soil in water conservancy projects,a triaxial test was designed and carried out,and it was obtained that the confining pressure has a consistent promoting effect on the loading stress of the soil,but the effect of freezing and thawing times on the loading stress of the soil has a phased characteristic.In the interval before and after 10 times,the freezing and thawing times and the loading stress are respectively negatively and positively correlated.The soil deformation can be divided into two stages:"linear elastic deformation-plastic hardening deformation",and the critical point of the stage increases with the increase of confining pressure;the confining pressure can promote the growth of linear elastic modulus,but the number of freeze-thaw cycles can promote the deformation mode in the plastic phase.volume growth.The thesis can provide reference for the analysis and research of the influence factors of the mechanical properties of rock and soil in water conservancy projects.
作者
刘晓琪
LIU Xiaoqi(Hebei Water Conservancy Planning&Design Institute Co.,Ltd,Shijiazhuang 050021,China)
出处
《水科学与工程技术》
2021年第3期13-16,共4页
Water Sciences and Engineering Technology
关键词
循环冻融
水利枢纽
土料填筑体
三轴
力学
cyclic freeze-thaw
water conservancy project
soil
triaxial
mechanics
