岩石地基斜锚-短桩复合基础抗拔承载性能研究

侯中伟; 田雷; 向城名

doi:10.3724/j.gyjzG23070803

岩石地基斜锚-短桩复合基础抗拔承载性能研究

doi: 10.3724/j.gyjzG23070803

1. 国网经济技术研究院有限公司, 北京 102209;
2. 国核电力规划设计研究院重庆有限公司, 重庆 401120

基金项目:

国家电网公司科学技术项目（5200-202256088A-1-1-ZN）

详细信息

作者简介:
侯中伟，正高级工程师，主要从事输电线路地基基础方面的研究工作。

通讯作者:
田雷，tian_leimail@163.com。

计量
- 文章访问数: 47
- HTML全文浏览量: 17
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2023-07-08

Research on Uplift Performance of Short Rock-Socketed Piles Combined with Inclined Anchor Bolts in Rock Mass

1. State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China;
2. State Nuclear Power Planning and Design Institute Chongqing Co., Ltd., Chongqing 401120, China

摘要

摘要: 采用模拟方法构建了山区输电线路岩石地基斜锚-短桩复合基础计算模型，对比模拟嵌岩短桩和斜锚-短桩复合基础的抗拔承载性能，分析抗拔基础荷载-位移曲线特征、岩体及桩身混凝土应力分布范围和特征，研究斜锚与短桩连接节点位置对斜锚-短桩复合基础抗拔性能的影响。结果表明：斜锚-短桩复合基础抗拔荷载-位移曲线呈初始弹性段、弹塑性过渡段和直线破坏段三阶段变化规律，斜锚的锚固作用可将上拔荷载传至更深和更大范围内的岩体，能显著提高斜锚-短桩复合基础抗拔承载能力；斜锚连接节点处桩身截面混凝土总体处于受拉状态，但斜锚与短桩连接位置附近混凝土出现部分压应力区；通过优化斜锚长度及斜锚连接节点位置，可实现减少嵌岩段桩长也能满足基础抗拔承载力的设计要求，从而有效降低基础施工难度，安全和经济效益显著。
- 斜锚-短桩复合基础 /
- 输电线路 /
- 上拔 /
- 数值模拟 /
- 岩石地基
Abstract: Numerical calculation models for a new-type composite foundation of electricity transmission lines in mountainous areas were established， consisting of a short rock-socketed pile and three inclined anchor bolts. The uplift performance of the composite foundation was simulated and compared to that of rock-socketed short piles without anchor bolts. The characteristics of the uplift load-displacement curves were analyzed， as well as the distribution patterns and features of stress in the rock mass and pile concrete. In addition， the influence of the connected position between inclined anchor bolts and short piles on the uplift performance of the foundation was also investigated. In general， the uplift load-displacement curves of the composite foundation approximately exhibited three typical regions： an initial linear region， a curvilinear transition， and a final linear region. The anchoring effect of inclined anchor bolts transfered the uplift load to deeper and more extensive rock masses around the foundation， thereby improving the uplift bearing capacity of the composite foundation. The concrete section of the pile at the anchor connection position was in an overall tensile stress state， but there was a partial compressive stress zone in the concrete near the connection position between anchor bolts and was short piles. By optimizing the length of inclined anchor bolts and the anchor connection position， it is possible to reduce the embedment depth of a rock-socketed pile while still meeting the same uplift capacity requirements for the foundation. As a result， the difficulty of foundation construction can be effectively reduced， achieving significant safety and economic benefits.
- composite foundation with inclined anchor bolts and short rock-socketed piles /
- transmission lines /
- uplift /
- numerical simulations /
- rock foundation

HTML全文

参考文献(27)

[1]	鲁先龙,崔强.架空输电线路基础设计[M].北京:中国电力出版社,2021.
[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.
[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.
[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.
[5]	MUKHERJEE S,KUMAR L,CHOUDHARY A K,et al. Pullout resistance of inclined anchors embedded in geogrid reinforced sand[J] Geotextiles and Geomembranes,2021,49:1368-1379.
[6]	杨石春.嵌岩灌注桩极限承载力的计算和试验验证[J].工业建筑,2021,51(11):143-148 ,194.
[7]	初立波,王汉迎,李斌,等.嵌岩桩竖向抗压承载力试验研究[J].建筑结构,2022,52(增刊2):2510-2514.
[8]	李才华,窦鹏冲.输电线路岩石锚杆基础抗拔试验分析[J].武汉大学学报(工学版),2020,53(增刊1):116-120.
[9]	周予启,阎培渝.超大直径嵌岩桩沉降长期效应研究及实测[J].工业建筑,2020,50(9):106-111.
[10]	张曦,冷建,谢锦波,等.嵌岩桩在强风化花岗岩海床中的孔壁失稳[J].科学技术与工程,2023,23(3):1199-1206.
[11]	毛丽荣,郑众安,吴建勇,等.掏挖与岩石锚杆复合型基础上拔承载机理和影响因素研究[J].长江科学院院报,2021,38(11):102-107 ,114.
[12]	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.
[13]	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.
[14]	王钦科.浅覆盖层嵌岩桩抗拔承载特性及理论计算研究[D].成都:西南交通大学,2021.
[15]	CHE N,WANG H N. DEM investigation of rock/bolt mechanical behaviour in pull-out tests[J]. Particuology. 2020,52:10-27.
[16]	丁士君,杨文智,朱照清,等.坚硬岩地基锚杆抗拔承载机制及破坏模式分析[J].工业建筑,2023,53(8):191-198.
[17]	陈昌富,梁晓腾,张根宝.考虑土体变形与界面剪切耦合作用锚杆拉拔响应[J].科学技术与工程,2018,18(23):276-280.
[18]	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.
[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.
[20]	黎双邵,孙红梅.斜锚桩在锚桩法静载试验中的应用[J].中国港湾建设,2020,40(7):30-32.
[21]	中华人民共和国住房和城乡建设部.混凝土结构设计规范:GB/T 50010-2010[S].北京:中国建筑工业出版社,2024.
[22]	熊昊,刘润,徐余.抗拔桩承载特性研究与三维数值仿真分析[J].工程地质学报,2013,21(3):400-407.
[23]	黄挺,罗成未,焦澳,等.密实砂中刚性锚桩斜向抗拔承载特性[J].工业建筑,2023,53(3):180-187.
[24]	戎贺伟.围压条件下软岩锚杆拉拔特性研究[D].张家口:河北建筑工程学院,2021.
[25]	CHIN F K. Estimation of the ultimate load of piles from tests not carried to failure[C]//Proceedings of the Second Southeast Asian Conference on Soil Engineering. Melbourne:Australian Road Research Burea,1970.
[26]	CARTER J P,KULHAWY F H. Analysis and design of drilled shaft foundation socketed into rock:Report EL-5918[R]. Palo Alto:Electric Power Research Institution U. S,1988.
[27]	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.