本项目线路跨越两个构造单元，穿越白垩系和石炭系两套地层，沿线分布有软土、液化砂层、易软化碎屑岩和岩溶等不良地质和特殊性岩土，多层地下水，地质条件复杂。制定了勘察安全文明施工标准，从交通警示、施工围蔽、泥浆外泄防护、废土、芯清理等进行了详细的规定，规范了检查验收流程，对广州当地勘察业务施工标准的提高起到示范带头作用。

The project line spans over two construction units and goes through Cretaceous and Carboniferous stratigraphic systems, and adverse geological sections and special rock-soils, such as soft soil, liquefying sand layer, easily softening clastic rocks and karst are scattered along the line, making the geological conditions very complex together with multi-layer groundwater. Construction standard for survey safety and civilization is formulated detailed provisions on traffic warning, construction enclosure, mud leakage protection as well as waste soil and core cleaning. As a result, the acceptance process is standardized, and we play a leading and demonstration role for the improvement of the construction standard for the local survey operation.