浅覆盖层软质岩中抗拔桩承载特性现场试验研究

doi:10.16285/j.rsm.2017.2155

岩土力学 ›› 2019, Vol. 40 ›› Issue (4): 1498-1506.doi: 10.16285/j.rsm.2017.2155

浅覆盖层软质岩中抗拔桩承载特性现场试验研究

王钦科¹，马建林¹，胡中波^{1, 2}，王滨³

1. 西南交通大学土木工程学院，四川成都 610031；2. 中国长江三峡集团公司，北京 100038；3. 国家电网四川省电力公司，四川成都 610041

收稿日期:2017-10-29 出版日期:2019-04-11 发布日期:2019-04-28
通讯作者: 马建林，男，1958年生，博士，教授，主要从事地基基础工程等方面的研究工作。E-mail: majianlin01@126.com E-mail:qkwang_90@163.com
作者简介:王钦科，男，1990年生，博士研究生，主要从事桩基工程方面的研究工作
基金资助:
国家重点研发计划资助(No. 2016YFC0802203)。

Field tests on bearing behaviors of uplift piles in soft rock with shallow overburden

WANG Qin-ke¹, MA Jian-lin¹, HU Zhong-bo^{1, 2}, WANG Bin³

1. School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. China Three Gorges Corporation, Beijing 100038, China; 3. State Grid Sichuan Electric Power Company, Chengdu, Sichuan 610041, China

Received:2017-10-29 Online:2019-04-11 Published:2019-04-28
Supported by:
This work was supported by the National Key R&D Program of China (2016YFC0802203).

摘要/Abstract

摘要： 我国西部地区的电力工程正日益增加，浅覆盖层软质岩中抗拔桩在输电线路工程的杆塔基础设计中极为常见，而目前对此的相关研究相对较少，现行规范对软质岩层的桩侧摩阻力取值也有待完善。在广元市清江河南侧采用现场试验的方法研究了5根抗拔桩的承载特性，整理分析了Q-s关系曲线、桩身轴力分布和桩侧摩阻力发挥情况，得到了强风化砂岩和中风化砂岩的桩侧极限摩阻力标准值。拟合出软质砂岩的平均桩侧极限摩阻力与岩石单轴抗压强度之间的关系，进一步总结出抗拔桩极限承载力的预测公式，并将现行规范计算结果与现场试验测试结果作对比分析。结果表明，软质砂岩的平均桩侧极限摩阻力与岩石单轴抗压强度可用指数函数形式表示；强风化砂岩、中风化砂岩的桩侧极限摩阻力标准值分别为472、1 027 kPa，可为实际工程提供参考依据。

关键词: 抗拔承载特性, 现场试验, 桩侧极限摩阻力, 岩石单轴抗压强度, 现行规范

Abstract: The uplift piles in soft rock with shallow overburden are common in the design of tower foundation of transmission line projects in western China, but there are relatively few studies on the uplift piles at present. The choice of pile side friction resistance value in soft rock in current codes needs to be improved. In this study, field tests in the south side of the Qingjiang river in Guangyuan City were conducted to investigate the bearing performance of 5 uplift piles. By analyzing the Q-s curve, the axial force distribution of pile shaft and the exertion of pile side friction, the standard values of pile side ultimate friction of severely weathered sandstone and weathered sandstone were obtained. The relationship between the average ultimate friction resistance and the uniaxial compressive strength (UCS) of the soft sandstone was obtained as well. A formula to predict the ultimate bearing capacity of an uplift pile was also proposed. In addition, comparison was made between the field test measurements and the value calculated using the existing standards. Our study found an exponential relation between the average side resistance of piles and the UCS of soft sandstone. The standard values of the ultimate side friction found in heavily and medium weathered sandstones were 472 kPa and 1,027 kPa, respectively. This finding provides an engineering reference for future projects.

Key words: uplift bearing behavior, field test, ultimate side resistance, the UCS of rock, existing standards

中图分类号:

TU 473.1

王钦科, 马建林, 胡中波, 王滨, . 浅覆盖层软质岩中抗拔桩承载特性现场试验研究[J]. 岩土力学, 2019, 40(4): 1498-1506.

WANG Qin-ke, MA Jian-lin, HU Zhong-bo, WANG Bin, . Field tests on bearing behaviors of uplift piles in soft rock with shallow overburden[J]. Rock and Soil Mechanics, 2019, 40(4): 1498-1506.

参考文献

相关文章 15

[1]	张晓磊, 冯世进, 李义成, 王雷, . 路基高架过渡段高铁运行引起的地表振动现场试验研究[J]. 岩土力学, 2020, 41(S1): 187-194.
[2]	李任融, 孔纲强, 杨庆, 孙广超. 流速对桩−筏基础中能量桩换热效率与热力耦合特性影响研究[J]. 岩土力学, 2020, 41(S1): 264-270.
[3]	陆晨凯, 孔纲强, 孙广超, 陈斌, 殷高翔, . 桩−筏基础中能量桩热−力耦合特性现场试验[J]. 岩土力学, 2019, 40(9): 3569-3575.
[4]	冯君, 王洋, 吴红刚, 赖冰, 谢先当, . 玄武岩纤维复合材料土层锚杆抗拔性能现场试验研究[J]. 岩土力学, 2019, 40(7): 2563-2573.
[5]	吴爽爽, 胡新丽, 龚辉, 周昌, 徐楚, 王强, 应春业, . 3种模式下钻孔灌注桩桩-土剪切特性现场试验研究[J]. 岩土力学, 2019, 40(7): 2838-2846.
[6]	余瑜, 刘新荣, 刘永权, . 基坑锚索预应力损失规律现场试验研究[J]. 岩土力学, 2019, 40(5): 1932-1939.
[7]	李驰, 王硕, 王燕星, 高瑜, 斯日古楞, . 沙漠微生物矿化覆膜及其稳定性的现场试验研究[J]. 岩土力学, 2019, 40(4): 1291-1298.
[8]	信亚雯, 周志芳, 马筠, 李鸣威, 陈朦, 汪姗, 胡尊乐, . 基于现场双管试验确定弱透水层水力参数的方法[J]. 岩土力学, 2019, 40(4): 1535-1542.
[9]	任连伟, 孔纲强, 郝耀虎, 刘汉龙, . 基于能量桩现场试验的土体综合热导率系数研究[J]. 岩土力学, 2019, 40(12): 4857-4864.
[10]	崔光耀, 祁家所, 王明胜, . 片理化玄武岩隧道围岩大变形控制现场试验研究[J]. 岩土力学, 2018, 39(S2): 231-237.
[11]	王炳龙，梅祯，肖军华. 土工格室补强路基整治路基病害的试验研究[J]. , 2018, 39(S1): 325-332.
[12]	郭飞，陶连金，孔恒，马红红，张丽丽，张新全,. 兰州砂卵石地层盾构施工振动传播及衰减特性分析[J]. , 2018, 39(9): 3377-3384.
[13]	喻豪俊，彭社琴，赵其华,. 碎石土斜坡水平受荷桩承载特性研究[J]. , 2018, 39(7): 2537-2545.
[14]	王翔鹰，陈育民，江强，刘汉龙, . 抗液化排水刚性桩沉桩过程的土压力响应[J]. , 2018, 39(6): 2184-2192.
[15]	付海清，袁晓铭，王淼，. 基于现场液化试验的饱和砂土孔压增量计算模型[J]. , 2018, 39(5): 1611-1618.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

浅覆盖层软质岩中抗拔桩承载特性现场试验研究

Field tests on bearing behaviors of uplift piles in soft rock with shallow overburden

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 0