一般孔主要控制地基主要受力层深度当基础宽度不大于5m时，勘探孔深度对条形基础不应小于基础底面宽度的3倍，对单独柱基不应小于1.5倍，且不小于5m，控制性钻孔深度应超过地基变形计算深度，在上述规定深度内当遇到基岩等稳定地层时，勘探孔深度应进行适当调整。一般孔遇基岩面可以终孔，如果钻探过程中发现土洞溶洞，应加密勘探孔，以探明其空间分布情况。本工程勘探孔深度如下：
General holes mainly control depth of the main loaded layer of the foundation when foundation width is less than 5m, depth of exploratory holes for strip foundation should not be 3 times less than width of foundation base, for single column base should not 1.5 times less, and should not be less than 5m, depth of control hole should be above foundation deformation calculation depth, when meeting stable stratum such as bedrock with above regulated depth, depth of exploratory holes should be adjusted appropriately. Could end holes when encountering bedrock general holes, if find soil cave or karst cave in drilling process, should crowd exploratory holes so to examine its space distribution. Exploratory hole depth of this Project is as following:
