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In the Guangzhou area , the mining method as a accompanied subway construction gradually extend the open construction method , its destruction of the surface , not a great impact on the normal operation of the urban functions of the field area , and it applies The cross-section is flexible , and the construction speed is easier to control . Especially in the downtown area , the construction of the tunnel , the Shallow Excavation is a more appropriate , but also must be involved in the conduct of one of the methods than the election . Is important to note that the , Shallow Excavation construction water shut-off effect of the good or bad will be directly related to the success or failure of tunnel construction . Guangzhou region rich geological characteristics of thick sand layer water tunnel construction on the mining method requires the use of advance support plus the soft soil pre - reinforcement treatment method to solve the soft ground and water shutoff problem . From both theory and practice , the study was to investigate , through analysis of field stratigraphic geological conditions , hydrological conditions , surrounding environment conditions come up with effective methods of tunnel excavation and grouting water shut-off process , and grouting materials targeted analysis, selection , and ultimately the implementation of the project to achieve a rapid , efficient , economic purpose . Through theoretical analysis and on - site practice test , improved grouting process , grouting material is adjusted according to the comparison test , and improved penetration of water law found the pilot tunnel excavation excavation methods through research , the successful completion of the shallow dark digging the tunnel construction . The above research results have certain reference and guidance to use a similar approach to the construction of the tunnel project in the Pearl River Delta . At the same time , the design, construction , research and other departments also has certain reference value .
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