基于强溶蚀带特征的地基岩溶发育程度评价方法  

Evaluation method of development degree based on features of intense dissolution layer

作　　者：曹贤发 刘玉康[1,2] 刘之葵 张炳晖 CAO Xianfa;LIU Yukang;LIU Zhikui;ZHANG Binghui(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin,Guangxi 541004,China;College of Civil and Architecture Engineering,Guilin University of Technology,Guilin,Guangxi 541004,China)

机构地区：[1]广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《中国岩溶》2020年第4期577-583,共7页Carsologica Sinica

基　　金：国家自然科学基金(41867039);广西自然科学基金面上项目(2018GXNSFAA138139,2017GXNSFAA198238);广西建筑新能源与节能重点实验室项目(17-J-21-6);桂林理工大学博士科研启动基金(GUTQDJJ2014031)。

摘　　要：岩溶发育程度评价结论不能合理反映地基实际的岩溶问题处理难度,是导致目前岩溶区建筑基础选型失误屡见不鲜的根本原因。本文以南宁市吴圩国际机场新航站楼为工程背景,分析了现有的岩溶发育程度评价指标的局限性,论证了以强溶蚀带厚度作为岩溶发育程度评价指标的先进合理性,提出了岩溶发育程度评价的建议标准,结果表明:基于地基溶蚀率深度分布曲线划分的地基强溶蚀带,综合考虑了地基的岩面溶蚀和洞隙发育的主要深度范围,其分布特征能反映岩溶地基最为复杂的深度范围,其作为场地岩溶发育程度评价指标是合理的,其岩溶发育程度评价标准建议如下:当强溶蚀带厚度(M)分别为:<3.0 m,3.0 m≤M≤6.0 m,≥6.0 m时,场地岩溶发育程度可分别判定为岩溶弱发育、中等发育和强发育。It is common to make errors in the selection of building foundation in karst terrains.The root reason is that the practical difficulty of karst treatment in foundation cannot be reasonably reflected by the existing evaluation of karst development degree.Taking New Terminal of Nanning Wuxu International Airport as an engineering case,this article analyzes the limitation of the existing evaluation indices of karst degree,demonstrates the advanced rationality of using intense dissolution layer’s thickness as the evaluation index of karst degree,and proposes the recommended standard of this evaluation.Results show that the intense dissolution layer,divided by the curve of dissolution ratio depth distribution in a foundation,comprehensively considers the main depth range of dissolution degree of rock surface and the development of cave dissolution,and its distribution characteristics can reflect the depth range of most complex karst foundation.As the evaluation index of karst degree,it is reasonable.Its recommended values are suggested as follows,when the thickness of an intense dissolution layer is less than 3.0 m,more than or equal to 3.0 m and less than 6.0 m,and more than or equal to 6.0 m,the karst degree can be determined as weak development,medium development and strong development,respectively.

关 键 词：岩溶地基 岩溶发育程度 强溶蚀带 

分 类 号：P642.25[天文地球—工程地质学]