北京东部地区深部岩溶塌陷危险性综合评价  

Comprehensive Evaluation in Deep Burial Karst Collapse Risks in the eastern area of Beijing

作　　者：李巧灵 雷晓东[1] 李晨[1] 关伟[1] 何祎[1] 赵晨旭 LI Qiaoling;LEI Xiaodong;LI Chen;GUAN Wei;HE Yi;ZHAO Chenxu(Beijing Institute of Geo-exploration Technology, Beijing, 100120)

机构地区：[1]北京市地质勘察技术院,北京100120

出　　处：《城市地质》2018年第4期24-31,共8页Urban Geology

基　　金：通州城市副中心地区重大地质问题调查与评价项目(PXM2016_158203_000008);中国地质调查局项目(12120114033901)联合资助

摘　　要：关于岩溶塌陷的研究常见于50m以浅,而事实表明,在钻孔施工及岩溶水大量抽取等人为活动的影响下,具有发生深层隐伏岩溶塌陷的风险。结合地质背景,参考岩溶塌陷调查规范,提出深部岩溶塌陷的控制性因素为4大类5种影响因子,分别是碳酸盐岩地层条件(顶板破碎程度)、第四系条件(覆盖层厚度与底部土层性质)、构造条件(断裂构造)、地下水动力条件(水位变幅)。在系统调查分析各因子的基础上,通过基于层次分析的模糊综合评判法,评价了北京东部地区深部岩溶塌陷的危险性,将研究区分为3个等级,提出了地下水位监测、下管固井等工程防控措施。Karst collapse usually occurs in areas with thin covered strata.At present,research about karst collapse depth is shallower than50m.Although deep karst collapse is rare,some facts show that it will occur under the influence of drilling and large amount of karst water extraction.In view of the controlling factors of deep burial karst collapse,this paper proposes5main evaluation factors:fragmentation degree of carbonate rock roof,thickness of covered strata,properties of soil layer at the bottom of overburden,fracture,dynamic conditions of groundwater.On the basis of investigation and analysis of the5factors,the risk of deep covered karst collapse in the eastern area of Beijing was evaluated through fuzzy comprehensive evaluation.The site was classified into three sorts,and targeted prevention and control measures were proposed.

关 键 词：深部岩溶塌陷 张家湾断裂 燕郊断裂 模糊综合评价 

分 类 号：P642.25[天文地球—工程地质学]