第4期閩西職業(yè)大學(xué)學(xué)報(bào)2004年12月Journal of Minxi Vocational CollegeDecember 2004CFG樁在山區(qū)的應(yīng)用張惇(福建工程學(xué)院土木工程系,福建福州3500070摘要:闡述CFG樁的簡(jiǎn)明工作原理。通過(guò)福建龍巖山區(qū)某工程的應(yīng)用實(shí)例說(shuō)明其設(shè)計(jì)概況、實(shí)施要點(diǎn)和應(yīng)用在山區(qū)非堅(jiān)硬地基中的應(yīng)用經(jīng)濟(jì)合理性,并列舉載荷板試驗(yàn)和沉降監(jiān)測(cè)等資料,證明其技術(shù)的可靠性。關(guān)鍵詞:非堅(jiān)硬地基;CFG樁;褥墊層厚度;復(fù)合地基;試驗(yàn)與監(jiān)測(cè)中圖分類號(hào):TU473.1文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1008-4797(2004)04-0116-03Application of CfG piles in mountain areasZHANG DunDept of Civil Engineering, Fujian University of Technology, Fuzhou, Fujian, 350007, China)Abstract: This article gives a brief introduction of the working principle of CFG piles and explains the design method and the main points of implementation through a project in Longyan mountainarea.Also, it illustrates the economic reasonability of application in non-hard foundation of mountainareas to verify the technology reliability by the experiment of loading and data of subsidence monitorKey words: non-hard foundation; CFG pile; cotton-padded mattress; compound foundation; experiment and monitor山區(qū)房屋傳統(tǒng)上多采用淺基礎(chǔ)。近年來(lái),由于房合(圖2),且大體為一直線。說(shuō)明圍壓對(duì)樁體強(qiáng)度和地產(chǎn)業(yè)的發(fā)展,山區(qū)小高層建筑數(shù)量激增,天然地基模量的影響不大。承載力不能滿足基底壓力要求的實(shí)例已較多見(jiàn)。常見(jiàn)的對(duì)策是采用樁基礎(chǔ)或復(fù)合地基等。實(shí)踐證明,對(duì)非堅(jiān)硬地層,適用的復(fù)合地基由于其成本低廉而更江影游受歡迎。尤其是CFG樁,對(duì)于地基土圍壓較低的山區(qū)場(chǎng)地更為適合。以下結(jié)合工程實(shí)例,介紹山區(qū)地基條件下,CFG樁的簡(jiǎn)單機(jī)理、相關(guān)工藝與實(shí)施效果,A,⊥ iii并展望其應(yīng)用前景。1CFG樁適合山區(qū)非堅(jiān)硬地基的機(jī)理圖1樁、土應(yīng)力對(duì)比隨褥墊層厚度變化示意CFG樁是水泥粉煤灰碎石樁的簡(jiǎn)稱。其樁體和表1樁承擔(dān)荷載占總荷載百分比如=Pp/P樁間土、褥墊層一起形成復(fù)合地基。設(shè)置褥墊層是荷載褥墊厚度(mm)CFG樁復(fù)合地基的一個(gè)核心技術(shù)。褥墊層本身是粒備注(P/kPa)20300狀材料墊層,改變其厚度可以調(diào)節(jié)樁土荷載分擔(dān)比652714樁長(zhǎng)2.25m,樁徑(圖1)。樁、土分擔(dān)總荷載的比例分別用p、表示。723226160mm,荷載板其中乙=Pp/P表示樁承擔(dān)總荷載百分比與褥墊層1.05m*1.05m厚度的關(guān)系(表1)。取CFG樁試樣進(jìn)行三軸壓縮試驗(yàn),結(jié)果表明在不同圍壓下的應(yīng)力應(yīng)變曲線基本重rv中國(guó)煤化工效果好的還是的主,[收稿日期]2004-CNMHG[作者簡(jiǎn)介]張惇(1967—),福建津州人,男,工程師,講師,從事教學(xué)及相應(yīng)工程實(shí)踐工作。CFG樁體的性能大致不變。如能根據(jù)被加固土體的300mm。預(yù)估筏形基礎(chǔ)最終沉降量S