机场岩溶空腔浅伏区地基处理技术研究

机场岩溶空腔浅伏区地基处理技术研究
摘要:依托湖南郴州机场岩溶空腔浅伏地段工程,研究在4000 kN夯击能处理地基条件下土体变形及物理力学性质变化规律,通过标准贯入试验及动力触探试验,对比分析垫层强夯法和强夯置换墩法对浅埋岩溶空腔条件下的地基处理效果,验证机场工程岩溶空腔浅伏区强夯处理方法的适宜性。结果表明:地基处理深度在2.0 m以内,直接换填处理;处理深度为2.0~8.0 m,采用垫层强夯法处理,点夯两遍加满夯一遍,并采用点夯击数10~12击和最后2击平均夯沉量小于5 cm双重控制;处理深度为8.0~10.0 m,采用强夯置换墩法可以满足存在岩溶的飞行区地基强度要求,为岩溶空腔浅伏地段机场飞行区地基处理工程提供理论依据。

Abstract:Based on the project of shallow karst cavity in Chenzhou Airport, Hunan Province, the effects of dynamic compaction of cushion and replacement pier of dynamic compaction on the treatment of shallow karst cavity are analyzed. Under the ramming energy of 4000 kN, the law of soil deformation and the change of physical and mechanical properties are studied. The standard and dynamic penetration test are carried out to verify the suitability of dynamic compaction. Results indicate that if the depth of foundation treatment is less than 2.0 m, it can be directly replaced; if the depth of foundation treatment is 2.0~8.0 m, it can be treated by cushion dynamic compaction method with point compaction twice and full compaction once, under the double control of 10~12 point compaction and final twice compaction with average settlement less than 5 cm; if the depth of foundation treatment is 8.0~10.0 m, it can be treated by replacement pier of dynamic compaction method to meet the requirement of foundation strength in karst airfield. it provides theoretical basis for foundation treatment engineering of airfield in shallow karst cavity area.

中文标题：
机场岩溶空腔浅伏区地基处理技术研究
Foundation Treatment Technology of Airfield in Shallow Karst Cavity

作者：
王树华1,张鹏2,周治钊2,石天奇3
Wang Shuhua1,Zhang Peng2,Zhou Zhizhao2,Shi Tianqi3
作者简介:王树华,男,1983年生,汉族,湖南彬州人,工学学士,高级工程师,主要从事市政道路与桥梁设计工作。Email:258419153@qq.com
通讯地址：
1. 郴州市城市规划设计院, 湖南郴州 423000;    2. 湖南省交通规划勘察设计院有限公司, 湖南长沙 410219;    3. 北京交通大学 土木建筑工程学院, 北京 100044
1.ChenzhouCityUrbanPlanningandDesign,Chenzhou423000,Hunan,China;    2.HunanProvincialCommunicationsPlanning,SurveyandDesignInstitute,Changsha410219,Hunan,China;    3.SchoolofCivilEngineering,BeijingJiaotongUniversity,Beijing100044,China

中图分类号:TU472
doi:10.3969/j.issn.1007-2993.2020.05.001
出版物：岩土工程技术
收稿日期:2019-10-17
网络出版日期:2021-07-06


关键词:岩溶,机场飞行区,垫层强夯法,强夯置换墩法
Key words:karst,airfield,cushion dynamic consolidation method,dynamic consolidation replacement pier method
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基金项目：
基金项目:    国家自然科学基金(41772330)    澳门科学技术发展基金(0010/2018/A)

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