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（1 國家電網(wǎng)有限公司，  北京 100031；  2 中國能源建設(shè)集團(tuán)安徽省電力設(shè)計(jì)院有限公司， 合肥 230601；    3 中國電力科學(xué)研究院有限公司，  北京 100192）

［摘要］依托淮南—南京—上海1 000kV交流特高壓輸電線路工程建設(shè)，選擇淮南典型黏土地基，開展了3個帶承臺PHC管樁單樁、2×2和3×3兩種布置方式下的5個PHC管樁群樁現(xiàn)場試驗(yàn)，分析了水平力作用下PHC管樁單樁及群樁基礎(chǔ)的荷載位移曲線特征，并基于試驗(yàn)得到的基礎(chǔ)水平承載力特征值，進(jìn)一步分析了PHC管樁單樁及群樁水平力承載性能。結(jié)果表明：水平力作用下PHC管樁單樁及群樁的荷載-位移曲線均呈“緩變型”變化規(guī)律，可將6mm水平位移所對應(yīng)水平承載力的75%作為基礎(chǔ)水平承載力特征值；  基于單樁和群樁基礎(chǔ)水平承載力特征值計(jì)算得到PHC管樁群樁效應(yīng)系數(shù)為0.98，群樁基礎(chǔ)水平承載性能良好；  增大PHC管樁群樁的樁間距、擴(kuò)大承臺尺寸可顯著提高PHC管樁群樁基礎(chǔ)水平承載性能；  當(dāng)樁長達(dá)到一定長度后，樁長增加對提高其水平承載力并不顯著。

［關(guān)鍵詞］輸電線路；  PHC管樁；  特高壓；  水平荷載試驗(yàn)；  水平承載性能  

中圖分類號：TU398-7文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)17-0132-06

Tests on horizontal bearing performance of single PHC pipe pile and group PHC pipe piles for transmission line

L-Duo1, XIE Feng2, CHEN Pei3, ZHANG Mingrui2

(1 State Grid Corporation of China, Beijing 100031, China; 2 China Energy Engineering Group Anhui Electric Power Design Institute Co., Ltd., Hefei 230601, China；  3 China Electric Power Research Institute, Beijing 100192, China)

Abstract:Based on the construction of 1 000kV ultra-high voltage alternating current project from Huainan to Nanjing to Shanghai, the typical clay subgrade in Huainan was selected, and the field tests of three single PHC pipe piles with caps and five group PHC pipe piles with arrangements of 2×2 and 3×3 were carried out. The load-displacement curve characteristics of single PHC pipe pile and group PHC pipe piles foundation under the  horizontal forces were analyzed, and the characteristic values of horizontal bearing capacity of foundations were obtained based on test. The horizontal force bearing performance of single PHC pipe pile and group PHC pipe piles were analyzed furtherly. The results show that the load-displacement curves of single PHC pipe pile and group PHC pipe piles under the  horizontal forces are the “gradually variable” change law, and 75% of the horizontal bearing capacity corresponding to the 6mm horizontal displacement can be taken as the characteristic value of horizontal bearing capacity of foundations. Based on the calculation of the characteristic value of horizontal bearing capacity of single pile and group piles foundation, the effect coefficient of group PHC pipe piles is 0.98, and the horizontal bearing performance of group piles foundation is good. The horizontal bearing performance of group PHC pipe piles foundation can be significantly improved by increasing the piles spacing of group piles and enlarging the plane size of pile cap. When the pile length reaches a certain length, the increase of the pile length is not significant to increase its horizontal bearing capacity.

Keywords:transmission line; PHC pipe pile; ultra-high voltage; lateral load test; horizontal  bearing performance

*特高壓工程特殊基礎(chǔ)深化應(yīng)用研究（GC17201100065）。

作者簡介：呂鐸，碩士，高級工程師，Email:UHELL@163.com。