自平衡試驗(yàn)在鯉魚(yú)沱大橋中的應(yīng)用*
黃顯彬1，2，3，王虓陽(yáng)1,2，蒲鴻1，2，侯松1，2
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（1 四川農(nóng)業(yè)大學(xué)土木工程學(xué)院， 都江堰 611830； 2 村鎮(zhèn)建設(shè)防災(zāi)減災(zāi)四川省高等學(xué)校工程研究中心，都江堰 611830；3 四川省建筑設(shè)計(jì)研究院， 成都 610017)
［摘要］對(duì)于承受大荷載的小樁徑樁基的靜載試驗(yàn)，采用傳統(tǒng)堆載或錨樁提供反力，實(shí)現(xiàn)難度較大，故對(duì)于鯉魚(yú)沱大橋樁基，采用靜載自平衡試驗(yàn)。通過(guò)自平衡試驗(yàn)，對(duì)荷載箱埋設(shè)、組合千斤頂和油表率定、加載和卸載、單樁豎向承載力計(jì)算等關(guān)鍵過(guò)程予以控制。試驗(yàn)表明，試樁3c2，3c4的單樁豎向極限承載力為39 220kN；組合千斤頂和油表率定還需要進(jìn)一步規(guī)范；現(xiàn)有技術(shù)條件下，自平衡試驗(yàn)是承受大荷載樁基靜載試驗(yàn)的理想選擇；在工程樁中開(kāi)展自平衡試驗(yàn)需要慎重。［關(guān)鍵詞］鯉魚(yú)沱大橋; 樁基; 組合千斤頂; 平衡點(diǎn); 豎向承載力; 自平衡試驗(yàn)中圖分類(lèi)號(hào)：U446.1 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)14-0087-05
Application of self-balanced test in Li-yu Tuo BridgeHuang Xianbin1,2,3, Wang Xiaoyang1,2, Pu Hong1,2, Hou Song1,2（1 College of Civil Engineering, Sichuan Agricultural University, Dujiangyan 611830, China; 2 Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Dujiangyan 611830, China; 3 Sichuan Provincial Architectural Design and Research Institute, Chengdu 610017, China）Abstract: It is difficult for the traditional stack or anchor pile to provide reaction force for the static load test with small diameter pil foundation bearing large load. So self-balanced static load test was adopted in Li-yu Tuo Bridge. In selfbalanced load test, the key processes were controlled, such as load box burial, combined jack and oil table calibration, loading and unloading, and vertical bearing capacity calculation. The test shows that vertical ultimate bearing capacity of a single pile is 39 220kN for piles of 3c2 and 3c4. Combined jack and oil table calibration need further specified. Under the current technology, it is an ideal choice to apply self-balanced static load test for static load of heavy load pile foundation. It need to be careful to develop self-balanced load test in piles.Keywords: Li-yu Tuo bridge; pile foundation; combined jack; balance point; vertical bearing capacity; selfbalanced test
*村鎮(zhèn)建設(shè)防災(zāi)減災(zāi)四川省高等學(xué)校工程研究中心項(xiàng)目（CDPMV1403）,國(guó)家自然科學(xué)基金青年科學(xué)基金項(xiàng)目（5140081608），四川省教育廳科研項(xiàng)目（13ZB0293）。作者簡(jiǎn)介：黃顯彬，副教授，碩士生導(dǎo)師，Email:936846627@qq.com。
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