A. 勘探点间距不应大于50m
B. 勘探点宜在洞室中线外侧6～8m交叉布置
C. 采集试样及原位测试勘探孔数量不应少于勘探孔总数的2/3
D. 第四系中的一般性勘探孔可钻至基底设计标高下6～10m
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