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古今強(qiáng)1，侯家健2

（1 奧雅納工程顧問，深圳 518048；

2華南理工大學(xué)土木與交通學(xué)院高層建筑結(jié)構(gòu)研究所， 廣州 510640）

［摘要］在參閱文獻(xiàn)的基礎(chǔ)上，對(duì)抗浮設(shè)防水位、地下水浮力計(jì)算的部分地方經(jīng)驗(yàn)進(jìn)行了匯總對(duì)比，指出要對(duì)勘察建議的抗浮設(shè)計(jì)參數(shù)作必要的判斷與調(diào)整。結(jié)合工程案例分析，建議應(yīng)結(jié)合具體情況考慮采用被動(dòng)抗浮措施還是主動(dòng)抗浮措施，并盡可能了解施工階段和使用階段抗浮穩(wěn)定的各種工況，進(jìn)而有針對(duì)性地采取結(jié)構(gòu)抗浮措施。探討了抗拔構(gòu)件設(shè)計(jì)中安全系數(shù)取值、裂縫驗(yàn)算等重要問題。分析了地下水位變化對(duì)天然地基、復(fù)合地基和樁基安全度的影響，指出沿海地區(qū)的高層建筑往往具備利用有利水浮力的條件，補(bǔ)充了合理利用地下水浮力的具體設(shè)計(jì)建議。

［關(guān)鍵詞］地下水浮力； 抗浮設(shè)防水位； 抗浮安全系數(shù)； 抗拔構(gòu)件； 有利水浮力

中圖分類號(hào)：TU46文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002848X(2014)24013306

Thoughts on uplift pressure of underground water in foundation design

Gu Jinqiang1， Hou Jiajian2

 (1 Arup， Shenzhen 518048， China； 2 Tall Building Structure Research Institute， School of Civil Engineering

and Transportation， South China University of Technology, Guangzhou 510640， China)

Abstract:Based on relevant publications, experiences in difference areas were summarized and compared about antifloating fortification groundwater level and evaluation of uplift pressure of underground water. Parameters from geotechnical investigation report were recommended to be carefully verified before considering antifloating strategies. Based on case studies, it was suggested that the use of passive antifloating measures or active antifloating measures should be combined with the specific circumstances. All potential antifloating loading cases in construction stage and service stage should be taken into account to carry out proper antifloating measures accordingly. Important issues in uplift component design were discussed, such as safety factor and crack calculation. Impacts of groundwater level change on safety degree of natural subgrade, composite foundation and pile foundation were demonstrated. It was pointed out that highrise buildings in the coastal area could take the advantage of beneficial uplift pressure. Detailed design suggestions on the reasonable utilization of groundwater uplift pressure were given.

Keywords:uplift pressure of underground water; antifloating fortification groundwater level； antifloating safety factor； antipull component; beneficial effect of uplift pressure

作者簡(jiǎn)介：古今強(qiáng)，學(xué)士，高級(jí)工程師，注冊(cè)土木工程師（巖土），一級(jí)注冊(cè)結(jié)構(gòu)工程師，英聯(lián)邦結(jié)構(gòu)工程師（MISructE），Email: jinqiang.gu@arup.com。

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