摘要
山区掏挖岩石锚杆复合型基础的设计关键技术主要包括:设计方法,技术经济对比,标准化基础设计以及施工工序等方面。设计方法主要涉及承载力发挥系数的取值,结合数值模拟结果和目前试验结果,提出k_(1)、k_(2)的取值建议;在拟定的地质条件、基础作用力以及设计构造要求等技术条件下,分析掏挖锚杆复合基础、锚杆基础和挖孔基础的经济性,结果表明掏挖锚杆基础经济效益高;通过对掏挖~锚杆复合基础设计原则的确定,提出不同主柱直径下锚筋布置方式的建议;结合掏挖基础和锚杆基础施工特点,梳理掏挖-锚杆复合基础的施工工序。通过罗源湾电厂~碧里220 kV线路工程中17%基础选用掏挖~锚杆复合基础的实践,表明该基础型式具有良好的经济,社会及环境效益。
The key construction procedures of the composite foundation of the expanded base pier and the rock anchor in mountainous areas include design method,installation and cost comparisons,standardized foundation design and construction procedures.The design method mainly involves the selection of the coefficient of bearing capacity.Based on the numerical simulation and the current test results,the suggestions for the selection of k_(1)and k_(2)are proposed in the paper.Under the local geological conditions,loads acting on the proposed foundations and state-of-the-practice construction conditions,the combination of expanded base pier with rock anchor is proved to be cost effective.Through the determination of design principles of expanded base pier part and anchor part,the suggestions of anchor reinforcement arrangement under different diameter of main pier are proposed.In the Luoyuan Bay Power Plant-Bili 220 kV power transmission line project,17%of the foundations are composite foundation of expanded base pier with rock anchor,the result shows that this composite foundation receives cost,social and environmental benefits.
作者
张文翔
邱昊茨
李扬森
崔强
张振华
ZHANG Wenxiang;QIU Haoci;LI Yangsen;CUI Qiang;ZHANG Zhenhua(POWERCHINA Fujian Electric Power Engineering Co..Ltd.,Fuzhou 350001;State Grid Fujian QUANZHOU Electric Power Supply Co.Ltd.,Quanzhou 362000;State Grid Fujian Electric Power Co.Ltd.,Fuzhou 350001;China Electric Power Research Institute,Beijing 102401;College of Civil Engineering,Hefei University of Technology,Hefei 230009)
出处
《土工基础》
2021年第6期698-703,共6页
Soil Engineering and Foundation
基金
重庆市科学基金重点资助项目(035679)
2002年高等学校博士学科点专项科研资助项目(20020183061)。
关键词
掏挖锚杆复合基础
承载力发挥系数
标准化基础设计
施工工序
expanded based pier with rock anchors
coefficient of bearing capacity
standardized foundation design
construction procedures
