軟弱土地區(qū)載體樁復(fù)合地基豎向承載特性試驗(yàn)研究
李瑞1,馮志焱1,楊啟安2
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(1 西安建筑科技大學(xué),西安710055; 2 北京波森特巖土工程有限公司,北京 102218)[摘要]在軟弱土地區(qū)對(duì)載體樁進(jìn)行載荷試驗(yàn),通過(guò)監(jiān)測(cè)埋設(shè)的鋼筋應(yīng)力計(jì)研究分析加載過(guò)程中載體樁單樁的荷載傳遞規(guī)律及端阻的分擔(dān)情況,通過(guò)監(jiān)測(cè)鋼筋應(yīng)力計(jì)和土壓計(jì)研究分析載體樁復(fù)合地基的荷載傳遞規(guī)律和樁土應(yīng)力比。研究發(fā)現(xiàn)載體樁與普通混凝土灌注樁承載力發(fā)揮不同,并且目前大部分估算單樁承載力公式不適用于載體樁,采用Vesic在1972年提出的樁端極限荷載理論公式并且合理等效樁端面積進(jìn)行估算的結(jié)果比較接近實(shí)測(cè)值。[關(guān)鍵詞]載體樁復(fù)合地基;載荷試驗(yàn);承載力;荷載傳遞;樁土應(yīng)力比中圖分類號(hào):TU473文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002-848X(2011)02-0101-05Field test of vertical load-bearing characteristic of ram-compaction piles withcomposite bearing base composite foundation in soft soil areasLi Rui1, Feng Zhiyan1, Yang Qi′an2(1 Xian University of Architecture and Technology, Xian 710055, China;2 Beijing Puissant Geotechnical Engineering Co., Ltd., Beijing 102218, China)Abstract:In soft soil areas, through static load test and testing the embedding reinforcement stress gauges in the ram-compacted pile with bearing base, the characteristic of load transferring and ratio of end bearing to total load were studied. The law of load transferring and pile-soil stress ratio of composite foundation were also analyzed by testing the embedding reinforcement stress gauges and soil pressure gauges. The results show that the bearing expressing of ram-compacted piles with bearing base is different from ordinary piles, and most of the formula to estimate limit load are not suitable for this type of piles, while the estimated limit load using the formula suggested by Vesic in 1972 and reasonable equivalent pile area is close to the testing bearing capacity.Keywords:ram-compaction piles with composite bearing base composite foundation; static load test; bearing capacity; load transferring; pile-soil stress ratio作者簡(jiǎn)介:李瑞,碩士研究生,Email:lirui640@163.com。參考文獻(xiàn)[1]沈保漢. 我國(guó)夯擴(kuò)樁的發(fā)展現(xiàn)狀[J]. 工業(yè)建筑,2004,34(2):45-49.[2]張永央,陳新朝. 復(fù)合載體夯擴(kuò)樁單樁豎向極限承載力研究[J]. 資源環(huán)境與工程,2008,22(IS):223-225.[3]羅汀,姚仰平,夏傳勇,等. 夯擴(kuò)樁樁端承載力特性研究[J]. 工業(yè)建筑,2003,33(9):52-55.[4]仇凱斌,介玉新,李廣信,等. 復(fù)合載體夯擴(kuò)樁承載力性狀有限元分析[J]. 工程力學(xué),2002,19(3):90-94.[5]王俊林,胡彩虹,祝彥如,等. 復(fù)合載體夯擴(kuò)樁承載性狀試驗(yàn)研究[C]//第一屆中國(guó)水利水電巖土力學(xué)與工程學(xué)術(shù)討論會(huì)論文集,2006.[6]顧曉魯,錢鴻縉,劉惠珊,等. 地基與基礎(chǔ)[M]. 北京:中國(guó)建筑工業(yè)出版社,2003.[7]雷金波,姜弘道,鄭云揚(yáng),等. 帶帽樁復(fù)合地基復(fù)合樁土應(yīng)力比的計(jì)算及影響因素分析[J].巖土工程學(xué)報(bào),2005,27(11):1300-1305.[8]黃自文,胡釗芳. 復(fù)合地基樁土應(yīng)力比因素的分析[J]. 中國(guó)水運(yùn),2008,8(11):188-189.
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