岩溶地区地基处理及基础设计  

Foundation treatment and foundation design in karst areas

作　　者：吴盈[1] 罗俊 熊森[1] 郭嘉诚 WU Ying;LUO Jun;XIONG Sen;GUO Jiacheng(Central-South Architectural Design Institute Co.,Ltd.,Wuhan 430071,China)

机构地区：[1]中南建筑设计院股份有限公司,武汉430071

出　　处：《建筑结构》2024年第17期138-142,131,共6页Building Structure

摘　　要：阐述了岩溶地区地基基础常用的处理方法。在溶(土)洞强烈发育且岩溶上覆盖饱和砂层地区,桩基使用受限时,可采用整体性较好的箱形基础设计方案,以减小地基土附加应力和基础沉降。介绍袖阀管注浆在工程中的应用,根据溶(土)洞分布深度、洞高和平面位置,仅对部分溶(土)洞通过钻孔探测溶(土)洞边界,采用注浆封堵处理,以节省工程造价。在上部结构荷载较大区域,采用满布注浆孔注浆加固地基,以提高地基承载力;计算对比了地基加固前后的基础沉降。最后采用钻芯法对处理后地基进行了取样检测,介绍了注浆处理后的检测方案,保障处理后的地基达到工程效果。结果表明,加固效果良好。The common treatment methods for the foundation base in karst areas were expounded.In the areas with strong development of karst(soil)caves and saturated sand layers overlying the karst,when the use of pile foundations is limited,the box foundation design scheme with better integrity can be adopted to reduce the additional stress of foundation soil and foundation settlement.The application of sleeve valve pipe grouting in projects was introduced.According to the distribution depth,height and planar position of karst(soil)caves,only some karst(soil)caves were detected through drilling to explore the boundaries of karst(soil)caves,and grouting sealing treatment was adopted to save the project cost.In the area with large loads of the superstructure,grouting with full grouting holes were used to reinforce the foundation to improve the bearing capacity of the foundation.The foundation settlements before and after foundation reinforcement were calculated and compared.Finally,the core drilling method was used to sample and test the treated foundation,and the test scheme after grouting treatment was introduced to ensure that the treated foundation achieves the engineering effect.The results show that the reinforcement effect is good.

关 键 词：岩溶地区 基础设计 地基处理 注浆法 箱形基础 

分 类 号：TU471[建筑科学—结构工程]