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(1 北京市建筑工程研究院，北京100039；2 北京浩洋慧橋科技有限公司，北京100088；3 北京中闊地基基礎(chǔ)技術(shù)有限公司，北京100097；4 黃委會(huì)勘測規(guī)劃設(shè)計(jì)研究院，鄭州450003)

［摘要］通過現(xiàn)場靜載荷試驗(yàn)，在膨脹土地基中，對(duì)樁身穿越大氣影響深度并以硬塑黏土為承力盤和樁端持力層的單節(jié)DX擠擴(kuò)灌注樁，及以硬塑黏土為上承力盤持力層和以硬塑~堅(jiān)硬黏土為下承力盤和樁端持力層的兩節(jié)DX擠擴(kuò)灌注樁的極限承載力進(jìn)行判定，分析其荷載傳遞機(jī)理，并對(duì)其側(cè)阻力、盤端阻力和樁端阻力的分配及發(fā)展規(guī)律進(jìn)行研究。該兩種樁型在極限狀態(tài)下均顯示出以總側(cè)阻力為主的特性，屬于端承摩擦樁。

［關(guān)鍵詞］DX樁;承力盤;靜載荷試驗(yàn);極限承載力;側(cè)阻力;盤端阻力;膨脹土;黏土

中圖分類號(hào)：TU473.1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2011)02-0106-07

Test study on load transfer mechanism of DX piles for certain thermo-electric plant

Shen Baohan1, Wang Yan2, Liu Zhenliang3, He Dexin3, Geng Yuping4

(1 Beijing Building Construction Research Institute, Beijing 100039, China; 2 Beijing Smart Bridge Tech. Inc.，

Beijing 100088, China; 3 Beijing Zhongkuo Foundation Co., Ltd., Beijing 100097, China; 4 HRWCC Institute of

Geotechnical Investigation ＆ Surveying, Zhengzhou 450003, China)

Abstract:Static loading tests for DX piles with single bulb and double bulbs which installed in clay were conducted in field. Its ultimate bearing capacities were determined, and its load transfer mechanism was analyzed. The distribution and development of the skin-friction resistances, the bulb resistances and the point resistances of the DX piles were studied. Under ultimate conditions,both piles reflected characteristics which put skin friction resistances first are belong to point resistance-skin friction resistance piles.

Keywords:DX pile; bulb bearing; static loading test; ultimate bearing capacity; skin-friction resistance; bulb resistance; expansive soil; clay

作者簡介：沈保漢，教授級(jí)高級(jí)工程師，Email：shenbaohan@163.com。

參考文獻(xiàn)

［1］沈保漢, 賀德新，劉振亮,等.DX多節(jié)擠擴(kuò)樁的產(chǎn)生及特點(diǎn)［J］.工業(yè)建筑,2004，34(3)：1-4,8.

［2］沈保漢,賀德新.DX擠擴(kuò)灌注樁與DX液壓擠擴(kuò)裝置［J］.工業(yè)建筑,2008,38(5)：1-4.

［3］沈保漢.DX擠擴(kuò)灌注樁豎向抗壓極限承載力的確定［J］.工業(yè)建筑,2008,38(5)：13-17,27.

［4］沈保漢,賀德新，孫君平，等.影響DX擠擴(kuò)灌注樁豎向抗壓極限承載力的因素［J］.工業(yè)建筑,2008,38(5)：32-38,4.

［5］沈保漢.DX擠擴(kuò)灌注樁及其豎向抗壓極限承載力的若干問題［J］.工業(yè)建筑,2009,39(8)：84-95.

［6］陳輪，王海燕，沈保漢，等.DX樁承載力及其荷載傳遞特點(diǎn)的現(xiàn)場試驗(yàn)研究［J］.工業(yè)建筑,2004,34(3)：5-8.