基樁彈性模量對組合樁復(fù)合地基樁土荷載分擔(dān)比的影響
唐明雄
- 摘 要
-
（長沙市規(guī)劃設(shè)計院有限責(zé)任公司，長沙 410007）［摘要］在分析樁土相互作用的基礎(chǔ)上，將柔性樁和天然地基形成的復(fù)合地基當(dāng)作剛性樁的等效天然地基，考慮墊層效應(yīng)，推導(dǎo)了復(fù)合地基在彈性工作階段樁土的荷載分擔(dān)比及沉降的解析解，利用解析解編制程序分析長、短樁彈性模量對樁土荷載分擔(dān)比的影響。分析表明，隨長樁彈性模量的增大，長樁的荷載分擔(dān)比增大，短樁及樁間土的荷載分擔(dān)比減小, 但長樁的彈性模量大于28 000MPa時，其對樁土的荷載分擔(dān)比影響較??；隨短樁彈性模量的增大，長樁的荷載分擔(dān)比減小，短樁及樁間土的荷載分擔(dān)比增大。［關(guān)鍵詞］復(fù)合地基；組合樁；荷載分擔(dān)比；彈性模量Influence of elastic modulus of piles on share load ratio between pile and soil of combination-pile composite foundationTang Mingxiong（Changsha Planning & Design Institute Co., Ltd., Changsha 410007, China)Abstract:Regarding the combination-pile composite foundation made up of soft piles and nature soil as the substitute soil among rigid piles and considering cushion effect at the same time, share load ratio and settlement resolution of combination-pile composite foundation were deduced. Then the effect of modulus of piles on the share load ratio is analyzed. It is indicated that the share load of long-pile increases and the share load of cushion and short-pile decreases with the elastic modulus of long-pile increasing. But the influence on share load ratio diminished when the elastic modulus of long-pile is greater than 28 000MPa. The pattern of the short-pile and the soil foundation are contrary to the long-pile in the same conditions.Keywords:composite foundation; combination-pile； share load ratio; elastic modulus作者簡介：唐明雄，高級工程師，一級注冊結(jié)構(gòu)工程師，Email: hncstmx@sina.com。參考文獻［1］周德泉,張可能,劉宏利. 組合樁型復(fù)合地基樁、土受力特性的試驗對比與分析［J］.巖石力學(xué)與工程學(xué)報,2005,24（5）：872-879.［2］陳善雄. 長、短樁相結(jié)合的水泥粉噴樁復(fù)合地基設(shè)計計算方法探討［J］. 土木工程學(xué)報，2002，35（5）：79-81．［3］葛忻聲，龔曉南.長短樁復(fù)合地基設(shè)計計算方法的探討［J］.建筑結(jié)構(gòu)，2002，32(7)：3-4．［4］池躍君,宋二祥,陳肇元.剛性樁復(fù)合地基豎向承載特性分析［J］.工程力學(xué),2003,20(4)：9-14.［5］GB50007—2002建筑地基基礎(chǔ)設(shè)計規(guī)范［S］.北京： 中國建筑工業(yè)出版社，2002.［6］JGJ79—2002 建筑地基處理技術(shù)規(guī)范［S］. 北京: 中國建筑工業(yè)出版社，2002.
