旋挖擴(kuò)底抗拔樁受力機(jī)理及擴(kuò)底段作用機(jī)制研究
徐壯濤1, 張靜2
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(1 上海市城市建設(shè)設(shè)計(jì)研究總院， 上海 200125； 2 上海巖土工程勘察設(shè)計(jì)研究院有限公司， 上海 200031)
［摘要］依托中國(guó)2010年上海世界博覽會(huì)B片區(qū)地下空間工程，進(jìn)行11組旋挖擴(kuò)底抗拔樁靜載荷試驗(yàn)，并測(cè)試樁身軸力。選取持力層分別為黏性土和砂土的1#試樁和11#試樁來(lái)探討擴(kuò)底抗拔樁的受力機(jī)理。試驗(yàn)得出，最大加載量下擴(kuò)底抗拔樁樁身變形量占樁頂變形比例可達(dá)80%，并采用數(shù)值分析擬合試樁曲線，分析不同持力層的擴(kuò)底段受力特點(diǎn)，發(fā)現(xiàn)擴(kuò)底抗拔長(zhǎng)樁對(duì)樁周土體應(yīng)力的影響范圍為徑向1倍擴(kuò)底段長(zhǎng)度、縱向沿樁端向上2倍擴(kuò)底段長(zhǎng)度。［關(guān)鍵詞］抗拔樁; 旋挖擴(kuò)底; 受力機(jī)理; 持力層中圖分類號(hào)：TU473 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2016)08-0065-05
Study on stress mechanism of enlarged-base uplift pile and enlarged-base interaction mechanismXu Zhuangtao1, Zhang Jing2(1 Shanghai Urban Construction Design & Research Institute, Shanghai 200125, China; 2 Shanghai Geotechnical Investigations & Design Institute, Shanghai 200031, China)Abstract: Based on underground space project of the World Exposition Shanghai China 2010 B area, 11 groups of static load tests of enlarged-base uplift piles were carried out and the pile axial forces were measured. Stress mechanism of enlarged-base uplift pile was discussed based on 1# pile and 11# pile with bearing stratums of silty clay and silt respectively. Test results show that deformation of the pile under maximum test loading can be 80% of pile top deformation. Then numerical analysis was taken to fit stress features of enlarged-base pile. Mechanical characteristics of enlarged-base in different bearing stratums were analyzed and it is found that influence range of enlarged-base uplift pile on soil stress around enlarged-base is length of enlarged-base on radial direction and twice the length of enlarged-base from pile tip on longitudinal direction.Keywords: uplift pile; enlarged-base; stress mechanism; bearing stratum
作者簡(jiǎn)介：徐壯濤，碩士，高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：xztxzt@yeah.net。
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