Mechanism and Treatment Technology of Crystallization Blockage in Tunnel Drainage System
The crystallization blockage defect of tunnel drainage pipe has become a main factor affecting the safety of tunnel support structure.To solve the problem of crystallization blockage in tunnel drainage blind pipe,it is necessary to deeply investigate the mechanism and causes of crystallization blockage in tunnel drainage pipe.This paper comprehensively reviews the analysis of crystallization blockage mechanism of tunnel drainage pipe by scholars at home and abroad,systematically summarizes the influence degree and law of internal and external factors of drainage blind pipe on crystallization blockage,and puts forward the gaps in the study on crystallization blockage of tunnel drainage blind pipe.It is found that the components of crystals in karst areas come from soluble surrounding rocks,while those in non-karst areas come from shotcrete.The main component of crystals is calcium carbonate.The factors affecting the formation and accumulation of crystals can be classified in two categories:internal factors and external factors,and the problems to be highlighted in the next study are proposed.
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