海域岛礁地基岩体不良地质现象及精细化勘察

以舟山大陆连岛工程西堠门大桥为背景,研究了主塔基老虎山地基岩体缓倾角裂隙、断层、海蚀作用形成的海蚀洞、海蚀缝等不良地质现象及其对桥基稳定性的影响,分析了单孔声波和地震波测试、跨孔声波CT、压水试验、现场大剪试验、数字钻孔摄像等方法在该工程的应用,取得一系列定量的确定的地质结构参数,提出精细化勘察的概念,后期工程施工验证了精细化勘察资料的正确合理性。

GEOLOGY OF ROCK MASS FOUNDATION AND REFINEMENT INVESTIGATION IN SEA REEFS

Take the Xihoumen Suspension Bridge as a background,study on geology on the main tower foundation（such as gentle angle fractures,faults and marine eroding geomorphology）,which is at Laohushan,and on its impact on the stability of bridge foundation.The paper analyzed the possibility of the application of Single-hole velocity test,Single-hole wave velocity test,Cross-hole sound wave CT,Water pressure test,In-situ large scale shear test and Digital borehole imaging to this project,Obtained a series of quantitative and determination parameters of the geological structure,and proposed the concept of refinement investigation.The results showed that refinement investigation was proved correct and rational in the later period of project construction.