杆塔掏挖基础抗拔研究进展及其设计规范的修订  

Developments on Uplift Load-Displacement Behaviour and Design Code Revision for Digged Foundations of Transmission Towers

作　　者：鲁先龙[1] 程永锋[1] 包永忠[2] 杨文智[1] 

机构地区：[1]中国电力科学研究院,北京100192 [2]中国电力工程顾问集团中南电力设计院,湖北武汉430071

出　　处：《中国电力》2013年第10期53-59,共7页Electric Power

基　　金：国家电网公司2012年科技项目(复杂地质环境下输变电工程关键技术研究;GCB17201200123)

摘　　要：根据中国近年来掏挖基础抗拔试验和理论研究成果,分析掏挖基础抗拔荷载-位移曲线的特征,采用3种典型方法确定试验基础抗拔极限承载力和位移,并基于统计结果给出掏挖基础抗拔归一化荷载-位移曲线,提出掏挖基础抗拔极限承载力和位移的确定方法。根据建立的掏挖基础抗拔极限承载力计算理论,将理论计算结果和试验值进行对比,验证理论计算方法和参数取值的正确性。最后,介绍掏挖基础抗拔承载力设计规范修订情况,并分析了修订后杆塔掏挖基础抗拔设计的安全系数及其对应的可靠度指标。Based on the results of in-situ tests and theoretical researches of digged foundation in recent years,the characteristics of uplift load-displacement curves was analysed.The normalized uplift load-displacement curve and method to determine the bearing capacity of the foundation were suggested using three typical capacity evaluation criteria.The theoretical equations and parameters were derived.And then,the theoretical results were verified by the measured ultimate bearing capacity from in-situ tests.All these results were applied to the revision in the design code for digged foundations of transmission towers.The safety coefficient and the corresponding reliability index of bearing capacities of ultimate uplift bearing capacity was obtained according to the method in the revised design.

关 键 词：掏挖基础 抗拔 荷载-位移曲线 可靠度指标 

分 类 号：TU476[建筑科学—结构工程]