Besides the link with the document ĐCNPGC document the geological works and drilling results on physical-sample analysis has subdivided the class according to the geological characteristics of works include: amQ23 flow status, weak link, load poorly; mQ13b hard, hard plastic half status, link, load average; mQ13b tight State medium, medium link, load average; amQ13b hard plastic status-half hard, medium, link load average; amQ13a hard plastic condition-half hard, medium, link load average; amQ12 hard plastic condition-half hard, medium, link load average. In addition, the detection of the fault, the shallow gas pockets hidden risks, destabilize the Foundation of works, causing subsidence, lifting irregularities affect the lifespan of works in the area of research.
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