|
|
|
| STATIC AND DYNAMIC CONTRAST TEST FOR BEARING CAPACITY OF REFROZEN BRIDGE PILE FOUNDATION IN PATCHY PERMAFROST REGIONS |
| YU Dezhong1，CHENG Peifeng1，JI Cheng1，CUI Zhigang2 |
(1. School of Civil Engineering，Northeast Forestry University，Harbin，Heilongjiang 150040，China；
2. Daqing Oil Field and Bridge Engineering Construction Co.，Ltd.，Daqing，Heilongjiang 163000，China) |
|
|
|
|
Abstract To accurately know the refreezing time and capacity of the bridge bored pile constructed in polygonal permafrost regions，two test sites were chosen. Within each site，two 15 m test piles were built. The temperature monitoring system was established in one of the two sites to record and monitor the pile refreezing process. Based on the refreezing condition，static load and dynamic load tests were performed to determine the bearing capacity of the pile. Test results indicate that the mean permafrost temperature is －1.9 ℃. The trend of temperature change within the pile in refreezing process is similar to that of the permafrost temperature change 1 m beside the pile，which indicates that the difference of temperature change is smaller than 0.1 ℃. The calculated pile capacity fits well with the testing data by introducing the refreezing pile lateral frictional parameter to modify the soil mechanical model. The capacity error obtains from static load test and dynamic load test is 3.91%，which matches the test results. This reacher provides an evidence to design and test the pile foundations in permafrost areas.
|
|
|
|
|
|
| [1] 王建州，李生生，周国庆，等. 冻土上限下移条件下高温冻土桩基承载力分析[J]. 岩石力学与工程学报，2006，25(10)：4 226–4 232. (WANG Jianzhou，LI Shengsheng，ZHOU Guoqing，et al. Analysis of bearing capacity of pile foundation in high temperature permafrost regions with permafrost table descending[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(10)：4 226–4 232.(in Chinese))
[2] 王 旭，蒋代军，赵新宇，等. 多年冻土区未回冻钻孔灌注桩承载性质试验研究[J]. 岩土工程学报，2005，27(1)：81–84.(WANG Xu，JIANG Daijun，ZHAO Xinyu，et al. Experimental study on bering features of bored pile under non-refreezing condition in permafrost region[J]. Chinese Journal of Geotechnical Engineering，2005，27(1)：81–84.(in Chinese))
[3] 汪仁和，王 伟，陈永锋. 冻土中单桩抗压承载力模型试验研究[J]. 冰川冻土，2005，27(2)：188–193.(WANG Renhe，WANG Wei，CHEN Yongfeng. Model experimental study on compressive bering capacity of single pile in frozen soil[J]. Journal of Glaciology and Geocryology，2005，27(2)：188–193.(in Chinese))
[4] 陈久照，温振统. 高应变动力试桩中重锤–桩–岩土冲击响应的理论研究[J]. 土木工程学报，2007，40(5)：53–60.(CHEN Jiuzhao，WEN Zhentong. A theoretical study on the impulse response of hammer-pile-soil system in high strain dynamic pile test[J]. China Civil Engineering Journal，2007，40(5)：53–60.(in Chinese))
[5] 戚 炜. 单桩沉降变形与承载力的关系研究[硕士学位论文][D]. 西安：长安大学，2004.(QI Wei. The relationship between settlement property and bering capacity of single pile under axial-loads[M. S. Thesis][D]. Xi′an：Chang?an University，2004.(in Chinese))
[6] 张守国. 多年冻土地区钻孔灌注桩早期承载能力增长规律研究[硕士学位论文][D]. 西安：长安大学，2013.(ZHANG Shouguo. Development of the bearing capacity of cast-in-place piles in permafrost regions during the early construction stage[M. S. Thesis][D]. Xi′an：Chang?an University，2013.(in Chinese))
[7] 朱德举. 多年冻土地区钻孔灌注桩的有限元分析[硕士学位论文][D]. 哈尔滨：东北林业大学，2004.(ZHU Deju. Finite element analysis of bored pile in permafrost region[M. S. Thesis][D]. Harbin：Northeast Forestry University，2004.(in Chinese))
[8] RAUSEHE F，RICHARDSON B，LIKINS G. Multiplicative blow CAPWAP analysis of pile dynamic records[C]// STRESS WAVE?96，Conference. Orlando：[s.n.]，FL，1996：801–808.
[9] 孙学先，张 慧，田 明. 考虑多年冻土蠕变特性的抗拔桩非线性有限元分析[J]. 岩石力学与工程学报，2007，26(1)：3 101–3 106. (SUN Xuexian，ZHONG Hui，TIAN Ming. Nonlinear finite element analysis of uplift pile with consideration of creep characteristic in permafrost[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(1)：3 101–3 106.(in Chinese))
[10] 章金钊. 高原多年冻土地区桥涵设计与施工研究[J]. 中国铁道科学，2001，22(4)：40–46.(ZHANG Jinzhao. Study on design and construction of bridge and culvert in plateau permafrost region[J]. China Railway Science，2001，22(4)：40–46.(in Chinese))
[11] 肖建章. 青藏铁路旱桥桩基温度和力学特性研究[硕士学位论文][D]. 北京：中国科学院研究生院，2004.(XIAO Jianzhang. Study on properties of temperature and mechanics of land bridges in permafrost regions of Qinghai—Tibet railway[M. S. Thesis][D]. Beijing：Graduate University，Chinese Academy of Sciences，2004.(in Chinese))
[12] 徐春华，徐学燕. 多年冻土地区工程桩桩侧冻结力数值分析[J]. 哈尔滨工业大学学报，2007，39(4)：542–545.(XU Chunhua，XU Xueyan. Numerical analysis of adfreezing force of engineering pile in permafrost[J]. Journal of Harbin Institute of Technology，2007，39(4)：542–545.(in Chinese))
[13] 杨立专. 基于动力特性的桩基损伤检测和承载力评估技术研究[硕士学位论文][D]. 武汉：武汉理工大学，2008.(YANG Lizhuan. Research on damage detection and supporting capacity evaluation of the pile by dynamic characteristic[M. S. Thesis][D]. Wuhan：Wuhan University of Technology，2008.(in Chinese))
[14] 陈安国，刘东甲. 基桩高应变检测的拟合方法研究[J].工程地球物理学报，2008，5(2)：215–221.(CHEN Guoan，LIU Dongjia. Study on matching calculation for high strain test piles[J]. Chinese Journal of Engineering Geophysics，2008，5(2)：215–221.(in Chinese)) |
|
|
|
2015, Vol. 34 
