[1]许 健,袁 俊,管顺清,等.多年冻土区锥柱基础抗拔承载性能试验研究[J].西安建筑科技大学学报(自然科学版),2017,49(01):70-75.[doi:10.15986/j.1006-7930.2017.01.011]
　XU Jian,YUAN Jun,GUAN Shunqing,et al.Experimental studies on the uplift bearing capacity of cone-cylindrical foundation in permafrost area[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2017,49(01):70-75.[doi:10.15986/j.1006-7930.2017.01.011]
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多年冻土区锥柱基础抗拔承载性能试验研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
49
期数:
2017年01期
页码:
70-75
栏目:
出版日期:
2017-03-03

文章信息/Info

Title:
Experimental studies on the uplift bearing capacity of cone-cylindrical foundation in permafrost area
文章编号:
1006-7930(2017)01-0070-06
作者:
许 健1; 袁 俊2; 3; 管顺清2; 钱文君1
(1. 西安建筑科技大学土木工程学院,陕西西安 710055;2.中国电力工程顾问集团西北电力设计院有限公司,陕西西安710075;3. 中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000)
Author(s):
XU Jian1;  YUAN Jun2; 3;  GUAN Shunqing2;  QIAN Wenjun1
(1.College of Civil Engineering, Xi’an Univ. of Arch. & Tech., Xian 710055, China; 2.Northwest Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Xi?an 710075, China; 3. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China)
关键词:
多年冻土; 锥柱基础; 抗拔承载力; 温度场
Keywords:
permafrost;  cone-cylindrical foundation;  uplift bearing capacity;  temperature field
分类号:
TU445
DOI:
10.15986/j.1006-7930.2017.01.011
文献标志码:
A
摘要:
本文以青藏直流输电线路工程为背景，在活动层处于冻结和融化状态时，分别进行上拔和水平力组合荷载作用下锥柱基础抗拔承载特性真型载荷试验．试验表明：冻结期冻土地基整体处于冻结状态，冻土地基回冻情况良好；融化期最大融化深度与地基多年冻土上限较吻合，表明施工开挖对多年冻土地基热稳定性影响较小．上拔加载过程中基础底板接触土压力减小，基底扩展板上方土体土压力明显增大，基础侧壁土压力变化不明显．冻结期基础位移量显著低于融化期，承载力明显高于融化期；基础上拔荷载与上拔位移关系可采用幂函数模型进行预测．融化期基础抗拔承载力试验值与规范法计算结果比较吻合；冻结期试验抗拔承载力与规范计算值存在一定差异．
Abstract:
Based on the background of Qinghai-Tibet DC Engineering, the uplift bearing capacity of cone-cylindrical foundation under uplift and horizontal loads is put to test, while the active layer was in the freezing and thawing state. Research results show that the ground temperature is in a frozen state during the freezing period, indicating that the foundation refreezing is in a good condition. During the thawing period, the maximum melting depth is in accordance with the upper limit of permafrost, indicating that the effect of construction excavation on the thermal stability of frozen soil foundation is slight. The soil pressure of the foundation plate is reduced, the soil pressure on the top of the basal plate is obviously increased, and the pressure on the foundation wall is not obvious during the uplift loading process. The displacement of cone-cylindrical foundation in freezing period is significantly lower than that in the melting period and the bearing capacity is significantly higher than that in the melting period. The power function model can predict the relationship between uplift load and displacement. The calculation results of uplift bearing capacity by the standard method are in agreement with the experimental results in the melting period. However, there is some difference between the values of test and standard in the freezing period.

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备注/Memo

备注/Memo:
收稿日期:2016-01-12    修改稿日期:2017-01-03
基金项目:国家电网公司科学技术项目(SGKJJSKF[2009]553);冻土工程国家重点实验室开放基金项目(SKLFSE201312);西北电力设计院技术创新科研项目(XB1-TM04-2013)
作者简介:许健(1980-),男,博士,副教授,主要从事寒区岩土工程研究.E-mail: xujian@lzb.ac.cn
更新日期/Last Update: 2017-03-16