设计、施工、监测

软岩地基斜锚–短桩复合基础水平承载性能研究

  • 向城名 ,
  • 田雷 ,
  • 侯中伟 ,
  • 乾增珍
展开
  • 1.国核电力规划设计研究院重庆有限公司,重庆 401121;
    2.国网经济技术研究院有限公司,北京 102209;
    3.中国地质大学北京工程技术学院,北京 100083
向城名(1987—),男,重庆人,高级工程师,主要从事输电杆塔设计与规划研究工作。E-mail:xiangcm_mail@163.com
乾增珍(1975—),女,安徽宣城人,博士,副教授,主要从事混凝土结构与特殊土工程性质研究工作。E-mail:a894932371@163.com

收稿日期: 2023-10-30

  网络出版日期: 2024-09-04

基金资助

国家电网公司总部科技项目(5200-202256088A-1-1-ZN)

Investigation on Lateral Bearing Performance of Short Rock-socketed Pile Combined with Inclined Anchor Bolts in Soft Rock Mass

  • Xiang Chengming ,
  • Tian Lei ,
  • Hou Zhongwei ,
  • Qian Zengzhen
Expand
  • 1. State Nuclear Power Planning and Design Institute Chongqing Co., Ltd., Chongqing 401121, P.R. China;
    2. State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, P.R. China;
    3. School of Engineering and Technology, China University of Geosciences, Beijing 100083, P.R. China

Received date: 2023-10-30

  Online published: 2024-09-04

摘要

针对山区输电线路岩石地基斜锚–短桩复合基础这一新型基础型式,采用有限元方法构建并验证计算模型,并进一步以短桩的桩径及其嵌岩深度、斜锚长度、斜锚连接节点距地表深度为参数,开展嵌岩短桩及斜锚–短桩复合基础抗水平承载性能对比研究。基于斜锚–短桩复合基础水平荷载–位移曲线初始弹性段、弹塑性过渡段和直线破坏段的三阶段变化特征,确定了各基础相应阶段的水平承载力。研究岩体及桩身截面混凝土应力分布特征、斜锚与短桩连接节点位置对斜锚–短桩复合基础抗水平承载性能的影响规律,结果表明:斜锚与岩体间的黏结锚固作用可将基顶水平力转化为斜锚拉力,使水平荷载传递至斜锚周围及短桩桩端以下的岩体,进而有效提高斜锚–短桩复合基础水平承载性能。通过优化斜锚连接节点距地表深度,可减小桩径及其嵌岩深度同时满足相应基础抗水平承载力设计要求,从而有效降低基础施工难度,提高基础安全性。

本文引用格式

向城名 , 田雷 , 侯中伟 , 乾增珍 . 软岩地基斜锚–短桩复合基础水平承载性能研究[J]. 地下空间与工程学报, 2024 , 20(4) : 1275 -1285 . DOI: 10.20174/j.JUSE.2024.04.21

Abstract

A new composite foundation of electricity transmission lines in mountainous areas has been used in recent years, which is composed of a short rock-socketed pile and three inclined anchor bolts. In this study, the finite element method (FEM) was firstly utilized to establish and verify its FEM calculation model. In addition, the parameters of rock-socketed pile diameter and its embedded depth, inclined anchor length, and the depth of the inclined anchor connection position to the ground surface were considered to design and simulate the lateral bearing capacity of this new type composite foundation. Lateral bearing performances of the composite foundation were simulated, which were also compared to those of rock-socketed short piles without anchor bolts. According to the typical initial linear, curvilinear transition, and final linear regions of the lateral load-displacement curve of each foundation, the corresponding lateral bearing capacity was suggested. The stress distribution characteristics of the rock mass around pile body and that of the concrete section of the pile, as well as the variation of the depth of the inclined anchor connection position to the ground surface against the lateral bearing capacity indicated that the anchoring effect of the inclined anchor can convert the lateral loadings at the top of the foundation into the tension force of the inclined anchor, and can transfer the lateral load to the rock mass around the inclined anchor and below the end of the short pile, thereby effectively improving the lateral bearing capacity of the composite foundation. By optimizing the depth of the inclined anchor connection position to the ground surface, it is possible to reduce the diameter and the embedded depth of a rock-socketed pile and achieve the same lateral capacity of design requirements of transmission tower foundations. As a result, the difficulty of foundation construction can be effectively reduced, thus achieving significant safety and economic benefits.

参考文献

[1]郑卫锋, 张天光, 陈大斌, 等.我国输电线路基础工程现状与研究新进展[J]. 水利与建筑工程学报, 2020, 18(2): 169-175. (Zheng Weifeng, Zhang Tianguang, Chen Dabin, et al. Current status and latest research progress of tower foundation to transmission line in China[J]. Journal of Water Resources and Architectural Engineering, 2020, 18(2): 169-175. (in Chinese))
[2]鲁先龙. 架空输电线路岩石基础[M]. 北京: 中国电力出版社, 2023. (Lu Xianlong. Overhead transmission line foundations in rock mass [M]. Beijing: China Electric Power Press, 2023. (in Chinese))
[3]程永锋, 鲁先龙, 丁士君, 等.掏挖与岩石锚杆复合型杆塔基础抗拔试验与计算[J]. 电力建设, 2012, 33(3): 6-10. (Cheng Yongfeng, Lu Xianlong, Ding Shijun, et al.Experimental and computation research on the uplift of composite foundation of belled pier and rock anchor in transmission line engineering [J]. Electric Power Construction, 2012, 33(3): 6-10. (in Chinese)).
[4]崔强,邢明,杨文智,等. 喀斯特地区短桩锚杆复合基础现场抗拔试验及设计方法研究[J]. 岩石力学与工程学报, 2018, 37(11): 2621-2630.(Cui Qiang, Xing Ming, Yang Wenzhi, et al. Field pull-out test and design method of the short pile and anchor composite foundation in the Karst area [J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(11): 2621-2630.(in Chinese)).
[5]国家能源局. 输电线路岩石地基挖孔基础工程技术规范(DL/T 5845-2021) [S]. 北京: 中国电力出版社, 2022. (National Energy Administration. Technical code for shaft foundations of overhead transmission line engineering in rock mass[S]. Beijing: China Electric Power Press, 2022. (in Chinese))
[6]鲁先龙, 乾增珍, 杨文智, 等. 嵌岩桩的极限端阻力发挥特性及其端阻力系数[J]. 土木与环境工程学报(中英文), 2019, 41(4): 26-35. (Lu Xianlong, Qian Zengzhen, Yang Wenzhi, et al. Statistical analysis on end-bearing capacity and resistance factor for rock-socketed pile [J]. Journal of Civil and Environmental Engineering, 2019, 41(4):26-35. ( in Chinese)).
[7]鲁先龙, 乾增珍, 杨文智, 等. 嵌岩桩嵌岩段的岩石极限侧阻力系数[J].土木建筑与环境工程, 2018, 40(6): 29-38. (Lu Xianlong, Qian Zengzhen, Yang Wenzhi, et al. Analysis on ultimate side shear resistance factor of piles socketed into rocks [J]. Journal of Civil, Architectural & Environmental Engineering, 2018, 40(6):29-38. ( in Chinese)).
[8]Choi H Y, Lee S, Park H, et al. Evaluation of lateral load capacity of bored piles in weathered granite soil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2013, 139(9): 1477-1489.
[9]王田龙, 詹黔花, 帅海乐, 等. 嵌岩桩及较破碎岩石桩基影响系数探讨[J]. 地下空间与工程学报, 2020, 16(1): 312-318. (Wang Tianlong, Zhan Qianhua, Shuai Haile, et al. Study on coefficients for rock-socketed piles and less-fragmentized rock pile foundation[J]. Chinese Journal of Underground Space and Engineering, 2020, 16(1): 312-318. (in Chinese))
[10]曹卫平, 谢泽东, 岳亚新, 等. 受水平循环荷载影响的斜桩p-y曲线构建及应用[J].地下空间与工程学报, 2022, 18(5): 1594-1604, 1614. (Cao Weiping, Xie Zedong, Yue Yaxing, et al. The formation and application of batter pile p-y curve influenced by lateral cyclic load[J]. Chinese Journal of Underground Space and Engineering, 2022, 18(5):1 594-1604, 1614. (in Chinese))
[11]牟冬辉, 乾增珍, 谢子璐, 等. 嵌岩桩水平承载性能影响因素模拟分析[A]// 2021年全国工程地质学术年会论文集[C]. 北京: 中国地质学会, 2021: 8(400-407). (Mou Donghui, Qian Zengzhen, Xie Zilu, et al. Simulation analysis of factors affecting the horizontal bearing capacity of rock socketed piles[A]//. Proceedings of the 2021 National Engineering Geology Annual Conference[C]. Beijing: Geological Society of China, 2021: 8(400-407). ( in Chinese))
[12]Chen J J, Zeng F Y, Wang J H, et al. Analysis of laterally loaded rock-socketed shafts considering the nonlinear behavior of both the soil/rock mass and the shaft[J].Journal of Geotechnical and Geoenvironmental Engineering,2017,143(3): 06016025.
[13]张浦阳, 董宏季, 乐丛欢, 等. 海上风机嵌岩桩水平承载特性有限元分析[J]. 哈尔滨工程大学学报, 2021, 42(1): 132-138. (Zhang Puyang, Dong Hongji, Yue Conghuan, et al. Finite element analysis of the horizontal load-bearing characteristics of offshore wind turbine rock-socketed piles [J]. Journal of Harbin Engineering University, 2021, 42(1): 132-138. ( in Chinese))
[14]杨之俊, 方晴, 吕布, 等. 钻孔埋入式后压浆管桩水平承载特性研究[J]. 地下空间与工程学报, 2020, 16(4): 1056-1061. (Yang Zhijun, Fang Qing, Lü Bu, et al. The horizontal bearing properties of drilled and post-grouted concrete pipe pile [J]. Chinese Journal of Underground Space and Engineering, 2020, 16(4): 1056-1061. ( in Chinese))
[15]Carter J P, Kulhawy F H. Analysis of laterally loaded shafts in rock, Journal of Geotechnical Engineering[J]. 1992,118(6):839-855.
[16]Peng W Z, Zhao M H, Zhao H, et al. Behaviors of a laterally loaded pile located in a mountain side[J]. International Journal of Geomechanics, 2020, 20(8): 04020123.
[17]刘润, 李天亮, 练继建, 等. 海上风电嵌岩桩水平抗力影响因素研究[J]. 海洋工程, 2022, 40(4): 65-76. (Liu Run, Li Tianliang, Chen Jijian, et al. Research on influencing factors of horizontal resistance of rock-socketed piles in offshore wind power[J]. The Ocean Engineering, 2022, 40(4): 65-76.)
[18]谭鑫, 金宇轩, 赵明华. 锚杆与围岩共同作用的围岩特性曲线修正分析[J]. 地下空间与工程学报, 2020, 16(3): 812-819. (Tan Xin, Jin Yuxuan, Zhao Minghua. Correction analysis on ground reaction curve considering interaction between bolts and surrounding rock [J]. Chinese Journal of Underground Space and Engineering, 2020, 16(3): 812-819. (in Chinese))
[19]文永逸, 雷用, 胡明,等. 斜锚桩与抗滑桩联合支挡结构的力学行为分析[J]. 兵器装备工程学报, 2016, 37(11): 166-170. (Wen Yongyi, Lei Yong, Hu Ming, et al. Mechanical behavior analysis of combined retaining structure of inclined anchor pile and anti slide pile[J]. Journal of Ordnance Equipment Engineering, 2016, 37(11): 166-170. (in Chinese))
[20]文永逸, 雷用, 胡明等. 斜锚桩与抗滑桩联合支挡结构的参数敏感性有限元分析[J]. 后勤工程学院学报, 2017, 33(3): 35-39. (Wen Yongyi, Lei Yong, Hu Ming, et al. Finite element analysis on parameter sensitivity of the combined retaining structure of inclined anchor pile and anti-slide pile[J]. Journal of Logistical Engineering University, 2017, 33(3): 35-39. (in Chinese))
[21]Carter J P,Kulhawy F H. Analysis and design of drilled shaft foundation socketed into rock[R]. Palo Alto, California: Electric Power Research Institution U.S. 1988.
[22]Zhang X, Wu H, Li J, et al. A constitutive model of concrete based on Ottosen yield criterion [J]. International Journal of Solids and Structures, 2020, 3: 193-194.
[23]中国建筑科学研究院. 混凝土结构设计规范(GB50010—2010)[S]. 北京市: 中国建筑工业出版社, 2015. (China Academy of Building Sciences. Code for design of concrete structures (GB 50010—2010)[S]. Beijing: China Architecture & Building Press, 2015. (in Chinese))
文章导航

/