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（湖北省城建設(shè)計院股份有限公司， 武漢 430051）
［摘要］隨著武漢地區(qū)城市化進(jìn)程的不斷加快，巖溶發(fā)育區(qū)的超高層建筑也隨之日益增多，如何選擇經(jīng)濟(jì)合理的基礎(chǔ)形式成為一道難題。以洪山村城中村開發(fā)改造用地K2地塊（誠功大廈）為例，在武漢地區(qū)提出超高層建筑（大于200m）可采用以石灰?guī)r為天然地基的筏板基礎(chǔ)，經(jīng)專項(xiàng)論證，該基礎(chǔ)形式可行。對主樓進(jìn)行補(bǔ)充勘察，在主樓基礎(chǔ)范圍內(nèi)按3.0m×3.0m方格網(wǎng)間距布置勘探孔；同時以補(bǔ)充勘探孔兼做注漿孔，對基礎(chǔ)底面以下一定深度范圍內(nèi)石灰?guī)r中巖溶洞隙進(jìn)行注漿處理。針對巖溶注漿效果分別進(jìn)行了現(xiàn)場施工監(jiān)測、鉆孔取芯檢測和注水試驗(yàn)檢測，結(jié)果顯示巖溶注漿加固效果良好，滿足設(shè)計要求。根據(jù)沉降觀測報告可知，現(xiàn)階段累計沉降較小、沉降速率較緩、整體沉降均勻，屬正常荷載沉降。
［關(guān)鍵詞］超高層建筑；石灰?guī)r；天然地基；筏板基礎(chǔ)；注漿加固；沉降觀測
中圖分類號：TU471-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)10-0134-06
Application of raft foundation with limestone as natural foundation in super high-rise building
MIAO Liang, XU Lei
(Hubei Urban Construction Design Institute Co., Ltd., Wuhan 430051, China)
Abstract:With the continuous acceleration of urbanization in Wuhan area, the number of super high-rise buildings in karst development areas is increasing day by day. How to choose an economic and reasonable basic type has become a difficult problem. Taking plot K2 (Chenggong Mansion) of the development and renovation land for villages in Hongshan village as an example, it is proposed that a raft foundation with limestone as natural foundation can be used for super high-rise buildings (more than 200m) in Wuhan area. After special demonstration, the foundation type is feasible. Supplementary investigation was conducted on the main building, and exploration holes were arranged within the foundation range of the main building according to 3.0m×3.0m grid spacing. At the same time, the supplementary exploration hole is also used as the grouting hole to carry out grouting treatment on the rock cave gaps in limestone within a certain depth range below the foundation bottom surface. According to the effect of karst grouting, the site construction monitoring, drilling coring test and water injection test were carried out respectively. The results show that the reinforcement effect of karst grouting is good and meets the design requirements. According to the settlement observation report, at present, the accumulated settlement is small, the settlement rate is slow and the overall settlement is uniform, which belongs to normal load settlement.
Keywords:super high-rise building;limestone;natural foundation;raft foundation;grouting reinforcement;settlement observation
作者簡介：苗亮，學(xué)士，高級工程師，注冊土木工程師（巖土），Email:695986507@qq.com。
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