综合勘察手段在东黄山国际小镇岩溶探查中的应用

Application of comprehensive exploration methods in karst exploration of East Huangshan International Town

地下岩溶发育会破坏岩体的完整性,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。采用物探、钻探及后期验槽相结合的综合勘察方法能够相互验证、优势互补,极大提高岩溶勘察的精度。本文以东黄山国际小镇基础设施项目为例,针对项目建设过程中出现的岩溶工程地质问题,采用地质调查、地质钻探、高密度电法物探及后期验槽等多种勘察手段对研究区范围内的岩溶发育情况进行综合探查,查明研究区岩溶发育形态、充填情况以及水平和垂直方向分布规律,结果表明:研究区岩溶发育以覆盖型为主,主要集中在研究区中部和北部。地下溶洞为垂向多层串珠状溶洞,一般为2~3层,最多达5层,溶洞充填物具有一定的差异性;水平方向上表现为2条走向NEE沿河流分布的强发育条带,岩溶强发育条带与区内谭家桥断裂走向基本一致。研究成果为东黄山国际小镇后期优化施工图设计及岩溶专项治理方案提供了地质依据。

The development of underground karst will destroy the integrity of the rock mass,resulting in a significant reduction in the strength and bearing capacity of the rock mass,which poses a potential threat to the stability of the foundation of the engineering site.The comprehensive survey method combining geophysical prospecting,drilling and post-groove inspection can verify each other and complement each other’s advantages,greatly improving the accuracy of karst survey.In this paper,taking the infrastructure project of East Huangshan International Town as an example,aiming at the karst engineering geological problems in the process of project construction,various survey methods such as geological survey,geological drilling,high-density electrical geophysical prospecting and post-groove inspection are used to investigate the scope of the study area.The karst development in the study area was comprehensively investigated to find out the karst development form,filling and horizontal and vertical distribution rules in the study area.The results show that the karst development in the study area is dominated by covering type,mainly in the central and northern parts of the study area.The underground karst caves are vertical multi-layer beaded karst caves,generally 2~3 layers,up to 5 layers,and the fillings of the karst caves have certain differences;in the horizontal direction,there are 2 strong development strips with strike NEE along the river.the strong karst development zone is basically consistent with the trend of the Tanjiaqiao fault in the area.The research results provide a geological basis for the later optimized construction drawing design and karst special treatment plan of East Huangshan International Town.