双锚片螺旋锚倾斜拉拔承载特性与承载力计算方法研究  

Bearing characteristics and calculation method for pullout capacity of double-blade screw anchors under inclined loading

作　　者：胡伟[1] 李砥柱 林志 冯世进[2] 黄勇祥 HU Wei;LI Di-zhu;LIN Zhi;FENG Shi-jin;HUANG Yong-xiang(Hunan Province Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Hunan Electric Power Design Institute Co.,Ltd.,China Energy Group,Changsha,Hunan 410007,China)

机构地区：[1]湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湖南湘潭411201 [2]同济大学地下建筑与工程系,上海200092 [3]中国能源建设集团湖南省电力设计院有限公司,湖南长沙410007

出　　处：《岩土力学》2024年第6期1661-1674,1685,共15页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52178332,No.52078108)。

摘　　要：目前对多锚片螺旋锚倾斜拉拔承载特性机制的认识尚不全面,承载力计算方法也还不成熟。采用自制模型试验装置开展了双锚片螺旋锚的多角度倾斜拉拔模型试验,分析了荷载倾角、埋深比对荷载−位移曲线和抗拔承载力因子的影响规律。通过量化水平向和竖向的控制程度分析了两个方向的耦合效应;基于数值模拟标定了锚片间距和荷载倾角对锚片上土压力的影响,提出了锚片上土压力影响系数计算方法,引入考虑位移影响的土压力近似计算方法和p-y曲线法,构建了双锚片螺旋锚倾斜拉拔力学模型,提出了双锚片螺旋锚倾斜拉拔承载力计算方法和相应步骤,并在3个试验案例的计算中取得了较好的效果。所提模型和计算方法的研究思路可推广至其他多锚片的情况,但螺旋锚需满足属于刚性短桩的前提条件。Currently,the understanding of the load bearing characteristic and mechanism of multi-blade screw anchor is not complete,and the calculation method of bearing capacity is also not mature.In this paper,the multi-angle inclined pullout model tests of the double-blade screw anchor were carried out using a self-made model test device,and the influence of load inclination angle and burial depth ratio on load-displacement curves and bearing factor was analyzed.By quantifying the horizontal and vertical control degree,the coupling effect of the two directions was analyzed.Based on numerical simulation,the influence of anchor plate spacing and load inclination angle on the soil pressure on the anchor plate was calibrated,and a calculation method for the influence coefficient of soil pressure on the anchor plate was proposed.An approximation calculation method for soil pressure considering the influence of displacement and the p-y curve method were introduced to construct an inclined loading mechanical model of screw anchor with double blades.Furthermore,the calculation method and corresponding steps for inclined pullout bearing capacity were proposed,and good results were achieved in the calculation of 3 test cases.The research ideas of the model and calculation method in this paper can be extended to other cases with multiple anchor blades,but the screw anchor needs to meet the prerequisite of rigid short pile.

关 键 词：螺旋锚 倾斜拉拔 模型试验 锚片间距 承载力 

分 类 号：TU476[建筑科学—结构工程]