柔性基礎(chǔ)下CFG樁復(fù)合地基樁、土承載力發(fā)揮試驗(yàn)研究
佟建興,孫訓(xùn)海,王明山,閆明禮
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(中國(guó)建筑科學(xué)研究院地基所,北京 100013)[摘要]CFG樁復(fù)合地基樁、土發(fā)揮性狀與基礎(chǔ)剛度密切相關(guān)。剛性基礎(chǔ)和柔性基礎(chǔ)下CFG樁復(fù)合地基室內(nèi)模型對(duì)比試驗(yàn)得出,在試驗(yàn)條件下,兩者在樁土應(yīng)力比,樁、土荷載分擔(dān)比,樁、土承載力發(fā)揮,變形場(chǎng)和負(fù)摩擦區(qū)等性狀方面存在明顯差異。試驗(yàn)結(jié)果可為CFG樁復(fù)合地基在交通市政領(lǐng)域中的應(yīng)用提供參考。[關(guān)鍵詞]CFG樁復(fù)合地基;柔性基礎(chǔ);樁土應(yīng)力比;模型試驗(yàn)Model test study on CFG pile composite foundation under flexible foundationTong Jianxing, Sun Xunhai, Wang Mingshan, Yan Mingli(China Academy of Building Research, Beijing 100013, China)Abstract:The character of CFG pile composite foundation is correlated with rigidity of foundation. Model tests of CFG pile composite foundation under the flexible and rigid foundation are carried out.Some useful experimental data is obtained through the study. The differences of pile-soil stress ratio, pile-soil load ratio,deformation, negative skin friction, etc., are analyzed.The experimental results can provide valuable preference for the application of CFG pile composite foundation to the field of traffic and civicism.Keywords:CFG pile composite foundation; flexible foundation;pile-soil stress ratio;model test作者簡(jiǎn)介:佟建興,博士,副研究員,Email:tjxcabr@sina.com。參考文獻(xiàn)[1]JGJ79—2002建筑地基處理技術(shù)規(guī)范[S]. 北京:中國(guó)建筑工業(yè)出版社,2002.[2]閆明禮,張東剛. CFG樁復(fù)合地基技術(shù)及工程實(shí)踐[M]. 北京:中國(guó)水利水電出版社,2000.[3]佟建興,等. CFG樁復(fù)合地基承載力的確定[J]. 土木工程學(xué)報(bào),2005(7).[4]化建新,等. CFG樁墊層效應(yīng)研究[J]. 巖土工程技術(shù),1998(1).[5]吳慧明,龔曉南. 剛性基礎(chǔ)與柔性基礎(chǔ)下復(fù)合地基模型試驗(yàn)對(duì)比研究[J]. 土木工程學(xué)報(bào),2001,34(5).[6]李國(guó)維,楊濤. 柔性基礎(chǔ)下復(fù)合地基樁土應(yīng)力比現(xiàn)場(chǎng)試驗(yàn)研究[J]. 巖土力學(xué),2005,26(2).[7]李海芳,等. 路堤荷載下剛性樁復(fù)合地基的現(xiàn)場(chǎng)試驗(yàn)研究[J]. 巖土工程學(xué)報(bào),2004,26(3).[8]郭院成,等. 路基工后沉降變形控制新技術(shù)與橋頭跳車處理[C]∥第九屆土力學(xué)與巖土工程學(xué)術(shù)會(huì)議論文集,2003.
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