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（1 中國市政工程西北設(shè)計(jì)研究院有限公司，蘭州 730030；2 上海二十冶建設(shè)有限公司，上海 201999）

［摘要］由于巖溶地區(qū)地下溶洞分布復(fù)雜、形狀大小不一，給建筑結(jié)構(gòu)基礎(chǔ)設(shè)計(jì)帶來了困難。結(jié)合貴州巖溶強(qiáng)發(fā)育地區(qū)某實(shí)際工程，重點(diǎn)研究了在溶巖強(qiáng)發(fā)育地區(qū)樁端頂板厚度小于3D（D為樁徑）和5m時(shí)，溶洞體積、頂板厚度、巖體臨空面及應(yīng)力擴(kuò)散角對(duì)樁基承載力的影響，探討了同一建筑多種基礎(chǔ)形式的應(yīng)用以及基礎(chǔ)遇到溶洞時(shí)處理方法。得出如下結(jié)論：應(yīng)保證樁端下3D和5m范圍內(nèi)無軟弱夾層、斷裂破碎帶和洞穴分布，且在樁底應(yīng)力擴(kuò)散范圍內(nèi)應(yīng)無巖體臨空面；樁身穿越溶洞時(shí)，應(yīng)將頂板厚度乘以折減系數(shù)后計(jì)入側(cè)阻力的計(jì)算；相鄰樁基的樁端有高差且距離較近(凈距小于5m)時(shí)，樁端高差應(yīng)小于樁凈距（滿足樁底豎向應(yīng)力的擴(kuò)散角條件）；當(dāng)基巖面起伏較大且都是巖石地基時(shí)，同一建筑物可以采用用多種基礎(chǔ)形式。

［關(guān)鍵詞］巖溶強(qiáng)發(fā)育；頂板厚度；臨空面；應(yīng)力擴(kuò)散角；處理措施

中圖分類號(hào)：TU475文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)03-0126-06

Study on the foundation design of the structure in a karst area in Guizhou province

HEI Xiaodan1, GOU Binbin1, SUN Haifeng1, YIN Lei1, L- Shufang2, ZHU Quanxiu1

(1 China State Construction Engineering Corporation AECOM Consultants Co., Ltd., Lanzhou 730030， China;2 Shanghai Ershiye Construction Co., Ltd., Shanghai 201999， China)

Abstract:Due to the complex distribution and different shapes and sizes of underground karst caves in karst area, it is difficult to design foundation of building structure. Combined with a practical engineering in strong karst developed area in Guizhou province, the focus is  the influence of the volume of karst caves, roof thickness, the free surface of the rock mass and stress diffusion angleon the bearing capacity of the pile foundation when the thickness of the pile end roof thickness is less than 3D (D is the pile diameter) and 5m in the strong karst developed area. The application of multiple foundation forms in the same building and the treatment methods when the foundation encounters karst caves were discussed. The following conclusions are drawn: it should be guaranteed that there should be no weak interlayers, fractured zones and caves within the range of 3D and 5m below pile end, and there should be no rock free surface within the stress diffusion range of the pile bottom; when the pile body passes through the karst cave, the thickness of the roof should be multiplied by the reduction factor and counted into the calculation of the lateral resistance; if the pile end of adjacent pile foundations has height difference and the distance is relatively close (the net distance is less than 5m), the height difference of pile end should be less than the net distance of pile (satisfying the diffusion angle condition of vertical stress of pile bottom);when the bedrock surface fluctuates greatly and is all rock foundation, the same building can adopt mutiple foundation forms.

Keywords:karst development; thickness of roof; free surface; stress diffusion angle; treatment measure

作者簡介：黑曉丹，碩士，工程師，Email:heixiaodan@qq.com。