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为了校核和补充设计勘探成果,进一步为洞井工程施工提供详细准确的资料,以便正确选择科学的施工方法和支护形式,为“安全第一,预防为主”的指导思想奠定良好的基础。对不良地质地段,因钻机钻进超前探孔速度快,围岩扰动小,未知的地质条件对操作人员的有害影响较小,因此,在施工先期,多采用这种超前导洞和大孔径钻机超前钻进来进行超前探测。超前探孔、导洞及平洞关系见(图-1)。有些工程则辅以导洞先行的掘进方法,以获取更为精确的地质和水文资料。
In order to check and supplement the design exploration results, it is necessary to provide detailed and accurate data for the construction of cave engineering in order to correctly select the scientific construction methods and support forms and lay a good foundation for the guiding ideology of “safety first and prevention first” basis. For bad geology lots, the drilling rig has advanced drilling speed ahead, the disturbance of surrounding rock is small, and the unknown geological conditions have less detrimental impact on the operators. Therefore, in the early stage of construction, such advanced pilot tunnel and large-aperture drilling machine are mostly used Drill ahead for advanced detection. Advanced exploration holes, guide holes and holes see the relationship (Figure -1). Some projects are complemented by pilot tunneling methods to obtain more accurate geological and hydrological data.