Chemical method used for treating mud cake bonded to cutter disc of shield tunneling machine of clay stratum

The invention discloses a chemical method used for treating mud cake bonded to a cutter disc of a shield tunneling machine of a clay stratum. The method comprises the following steps that the shield tunneling machine is stopped; an acid solution and an oxidizing agent solution are sequentially pressed and injected to the cutter disc of the shield tunneling machine and react with the mud cake; gasgenerated by reaction is introduced into alkaline liquid for washing and then exhausted into a tunnel; the mud cake is soaked in a standing manner; and after the mud cake is fully dispersed, mud watercircular bin clearing is carried out on a shield excavation bin, and construction of the shield tunneling machine is restored. According to the method, the mud cake can be eliminated under the circumstance of not opening the bin, gas generated in the mud cake eliminating process of chemical substance can be reduced, meanwhile, the acid solution is used for increasing the utilization rate of an oxidizing agent, the cost an