United construction method for forming holes and grooves in deep sandy gravel stratum

The invention provides a united construction method for forming holes and grooves in a deep sandy gravel stratum. The united construction method comprises the steps: exploring the geological condition; discriminating between main holes and an auxiliary hole for construction; dismantling partition walls between the main holes and the auxiliary hole; conducing leaking stoppage on a protecting wall. According to the united construction method, the advantages and characteristics of drill-clamshell method, drill splitting method and pure milling method are effectively combined and comprehensively utilized; united construction is conducted in procedures, stratums and segments; for a sandy gravel stratum containing a large quantity of boulders, erratic boulders, cemented layers or deep covering layers, as well as other special geological layers, the problems of difficulty in breaking through and drilling, easy hole collapse and the like are solved, and hole-groove-forming construction is completed smoothly and effic