[1]游小锋,刘建坤,胡向东,等.先注浆再冻结对粉细砂力学性质影响的低温三轴试验（英文）[J].长安大学学报(自然科学版),2017,37(04):50-59.
　YOU Xiao-feng,LIU Jian-kun,HU Xiang-dong,et al.Influence of freezing after grouting on mechanical properties of fine sand based on low-temperature triaxial test[J].Journal of Chang’an University (Natural Science Edition),2017,37(04):50-59.
点击复制

先注浆再冻结对粉细砂力学性质影响的低温三轴试验（英文）()
分享到：

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第37卷
期数:
2017年04期
页码:
50-59
栏目:
冻土路基专栏
出版日期:
2017-07-14

文章信息/Info

Title:
Influence of freezing after grouting on mechanical properties of fine sand based on low-temperature triaxial test
作者:
游小锋; 刘建坤; 胡向东; 常 丹
1. 同济大学 土木工程学院，上海 200092；2. 北京交通大学 土木工程学院，北京 100044
Author(s):
YOU Xiao-feng;  LIU Jian-kun;  HU Xiang-dong;  CHANG Dan
1. College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
关键词:
道路工程; 粉细砂; 注浆; 人工地层冻结法; 低温三轴试验; 力学性质
Keywords:
road engineering;  fine sand;  grouting;  artificial ground freezing method;  low-temperature triaxial test;  mechanical property
分类号:
U416
文献标志码:
A
摘要:
人工地层冻结法中主要存在局部强度不足以及冻胀融沉2个弊端，而预注浆法可以提高粉细砂地层的整体强度及控制冻结后的地层冻胀量，被认为是对人工地层冻结法的有效补充。鉴于预注浆可以有效改善土体的强度及抗渗性，进行了一系列低温三轴剪切试验，研究了单纯冻结与先注浆再冻结2种试验方案对粉细砂抗剪强度的影响。在分析先注浆再冻结提高粉细砂强度效果的基础上，重点分析冷却温度、水灰比、含水量、养护时间以及侧压等对抗剪强度指标及应力-应变曲线峰值处割线模量的影响。研究结果表明：粉细砂抗剪强度随冷却温度的降低而增大，与水灰比、含水量、养护时间呈正比关系；割线模量也随冷却温度的降低而升高，与水灰比、含水量呈正比关系；此外，先注浆再冻结粉细砂土样的黏聚力与温度呈良好的线性关系，与水灰比、含水量呈良好的指数函数关系；内摩擦角与温度、含水量呈良好的幂函数关系，与水灰比呈良好的指数函数关系。该研究结果可为先注浆再冻结粉细砂的力学强度指标分析提供参考，也可为先注浆再冻结工法的水灰比、养护时间选择提供指导。
Abstract:
Partial deteriorated strength of frozen soil as well as frost heave and thaw subsidence were two main disadvantages of the artificial ground freezing method. The pregrouting method was regarded as a good supplement to the artificial ground freezing method to enhance the overall strength of fine sand ground and control the frost heave amount of ground after freezing. In view of pregrouting can effectively improve the strength and anti-permeability of soil, a series of indoor low-temperature triaxial shear tests were carried out and the effects of two experimental schemes, namely, freezing and freezing after grouting, on shear strength of fine sand were analyzed. Based on the analysis of fine sand strength improved by freezing after grouting, effects of cooling temperature, water-cement ratio, water content, curing time and lateral pressure on the strength and secant modulus at the peak of stress-strain curve were emphatically analyzed. The results show that the shear strength of sample increases with the decrease of cooling temperature and is proportional to water content, water-cement ratio as well as curing time, respectively. The grouted frozen samples always present higher secant modulus as expected with the decrease of cooling temperature and are proportional to water content, water-cement ratio and curing time. Besides, the cohesion c of fine sand reinforced by grouting and freezing shows a linear relationship with cooling temperature and an approximate exponential relationship with water-cement ratio and water content. Power function relationships are found among internal friction angle φ, cooling temperature and water content. There exists an exponential relationship between internal friction angle φ and water-cement ratio. This research provide references for the mechanical strength indices of fine sand reinforced by grouting and freezing, and guidance for the selection of water-cement ratio and curing time for artificial ground freezing projects.

相似文献/References:

[1]武建民,祝伟,马士让,等.应用加权密切值法评价基质沥青抗老化性能[J].长安大学学报(自然科学版),2012,32(01):0.
[2]张宜洛,袁中山.SMA混合料结构参数的影响因素[J].长安大学学报(自然科学版),2012,32(01):0.
[3]陈璟,袁万杰,郝培文,等.微观指标对沥青热稳定性能的影响[J].长安大学学报(自然科学版),2012,32(01):0.
[4]周兴业,刘小滔,王旭东,等.基于轴载谱的沥青路面累计当量轴次换算[J].长安大学学报(自然科学版),2012,32(01):0.
[5]李祖仲,王伯禹,陈拴发,等.轴载对复合式路面应力吸收层荷载应力的影响[J].长安大学学报(自然科学版),2012,32(01):0.
[6]关博文,刘开平,陈拴发,等.水镁石纤维路面混凝土路用性能[J].长安大学学报(自然科学版),2012,32(01):0.
[7]翁效林,王玮,张留俊,等.拓宽路基荷载下管桩复合地基沉降变形模式[J].长安大学学报(自然科学版),2012,32(01):0.
[8]穆柯,王选仓,柳志军,等.基于非饱和渗流原理的路基含水率预估[J].长安大学学报(自然科学版),2012,32(01):0.
[9]李振霞,陈渊召.不同类型半刚性基层材料性能的试验与分析[J].长安大学学报(自然科学版),2012,32(01):0.
[10]马 骉,马 晋,周宇鹏.沥青混合料降温收缩断裂特性[J].长安大学学报(自然科学版),2012,32(03):1.
　MA Biao,MA Jin,ZHOU Yu-peng.Cooling shrinkage fracture characteristic of asphalt mixture[J].Journal of Chang’an University (Natural Science Edition),2012,32(04):1.

更新日期/Last Update: 2017-07-17