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(1 河南大學(xué)土木建筑學(xué)院， 開封 475004； 2 開封市特殊土改性與修復(fù)工程技術(shù)研究中心， 開封 475004； 3 重慶大學(xué)土木工程學(xué)院， 重慶 400044)

［摘要］斜坡上樁基礎(chǔ)不僅要承擔(dān)上部建筑物傳遞下來(lái)的豎向荷載，還要承擔(dān)斜坡傳遞下來(lái)的土壓力等水平荷載，構(gòu)成了復(fù)雜的樁-土相互作用體系。為研究斜坡上樁基礎(chǔ)在豎向和彎矩荷載作用下的水平承載特性，通過(guò)自行設(shè)計(jì)的組合荷載加載裝置，開展了四種工況下斜坡上單樁室內(nèi)模型試驗(yàn)。分析在組合荷載作用下樁頂沉降、水平位移、樁身彎矩、樁側(cè)土壓力以及地基比例系數(shù)m值變化規(guī)律。試驗(yàn)結(jié)果表明：在樁頂施加豎向荷載有利于提高單樁的水平承載力，減小樁身的水平位移、彎矩和樁前側(cè)土壓力；在樁頂施加彎矩荷載-不利于單樁的水平承載力，隨著彎矩作用的增加，相同水平荷載作用下，樁身水平位移和樁前側(cè)土壓力明顯增加，而水平荷載對(duì)樁頂?shù)呢Q向沉降影響較??；地基比例系數(shù)不僅與樁周土體有關(guān)，還與施加的荷載類型和樁土交界處的水平位移有關(guān)，地基比例系數(shù)隨樁土交界處水平位移的增加迅速減小，最后趨近于穩(wěn)定。

［關(guān)鍵詞］樁基礎(chǔ)； 斜坡； 組合荷載； 水平承載特性

中圖分類號(hào)：TU473-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)13-0128-06

Study on horizontal bearing characteristics of pile foundation on slope under combined load

ZHANG Jianwei1,2, HAN Yi1,2, LI Rongxiang1,2, DING Xuanming3, BIAN Hanliang1,2

(1 School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, China; 2 Kaifeng Technology Research Center of Engineering on Soil Modification and Restoration, Kaifeng 475004, China; 3 School of Civil Engineering, Chongqing University, Chongqing 400044, China)

Abstract:The pile foundation on the slope not only bears the vertical load transferred from the upper building, but also bears the horizontal load such as the earth pressure transferred from the slope, forming a complex pile-soil interaction system. In order to study the horizontal bearing characteristics of pile foundation on the  slope under vertical and bending moment loads, the indoor model tests of single pile on the slope under four working conditions were carried out by self-designed combined load loading device. The variation rules of settlement of pile top, horizontal displacement, bending moment of pile body, earth pressure on pile side and proportion coefficient m of foundation under combined load were analyzed. The test results show that applying vertical load on the top of pile can improve the horizontal bearing capacity of single pile and reduce the horizontal displacement, bending moment and soil pressure in front of pile; applying bending moment load on the top of pile is not conducive to the horizontal bearing capacity of single pile. With the increase of bending moment load, the horizontal displacement and soil pressure in front of pile increase obviously under the same horizontal load, while influence of the horizontal load on the pile top vertical settlement is small; the proportion coefficient of the foundation is not only related to the soil around the pile, but also related to the type of load applied and the horizontal displacement at the pile-soil interface. The proportion coefficient of the foundation decreases rapidly with the increase of the horizontal displacement at the pile-soil interface, and finally tends to be stable.

Keywords:pile foundation; slope; combined load; horizontal bearing characteristics

*國(guó)家自然科學(xué)基金資助項(xiàng)目（51508163，51608071），河南省科技廳科技攻關(guān)重點(diǎn)項(xiàng)目（192102310226），河南省高等學(xué)校青年骨干教師培養(yǎng)計(jì)劃（2019GGJS041），河南大學(xué)研究生教育創(chuàng)新與質(zhì)量提升計(jì)劃（SYL18020101）。

通訊作者：邊漢亮，博士，講師，Email:bian2000@126.com。