摘要
地下岩溶发育破坏了岩体的完整性,导致岩体的强度和承载力大幅度降低,对工程场地地基稳定性构成潜在的威胁。本文依托东黄山国际小镇基础设施项目,在采用多种勘察手段相结合的方法确定岩溶发育特征的基础上,选取代表性的溶洞,采用按溶洞顶板安全厚度判别的定性评价方法和按顶板坍塌自行填塞判别、顶板抗弯安全厚度判别、按顶板抗剪安全厚度判别3种半定量评价方法对溶洞顶板安全厚度进行综合判别,对岩溶地基进行稳定性评价。研究结果表明:研究区揭露岩溶主要以覆盖型串珠状溶洞为主,多为充填型溶洞,选取的117个典型溶洞大多处于稳定状态,在自然状态下顶板稳定性较好,发生坍塌的可能性小。
The development of underground karst destroys the integrity of the rock mass,resulting in a large reduction in rock strength and bearing capacity,which poses a potential threat to the stability of engineering site foundation.Based on the Donghuangshan international small town infrastructure project,this paper selects the representative karst cave based on the combination of various survey methods to determine the karst development characteristics and the factors affecting the roof stability of the cave,and uses three semi-quantitative evaluation methods:the qualitative evaluation method according to the safety thickness of the cave roof,the self-filling judgment according to the roof collapse,the safety thickness of the roof bending and the safety thickness of the roof shear,and the stability evaluation of the cave foundation.The results show that most of the karst caves in the study area are covered with beaded caverns,mostly filled caverns.Most of the 117 typical caverns selected are in a stable state,and the roof stability is good in the natural state and the possibility of collapse is small.The research results can guide the foundation treatment and construction planning in karst area.
作者
李飞飞
牛真茹
Li Feifei;Niu Zhenru(Beijing Urban Construction Exploration & Surveying Design Research Institute Co.,Ltd.,Beijing 100101,China;Tianjin North China General Geological Exploration Institute,Tianjin 300181,China)
出处
《城市勘测》
2021年第5期193-197,共5页
Urban Geotechnical Investigation & Surveying
关键词
东黄山国际小镇
岩溶地基
定性评价
半定量评价
顶板稳定性
Donghuangshan international town
karst foundation
qualitative evaluation
semi-quantitative evaluation
roof stability
