Application of Auxiliary Pneumatic Construction Method for Large Diameter Mud-Water Balanced Shield
In domestic shield construction,auxiliary pneumatic tunneling method is often used in the earth pres-sure shield tunneling of"soft above and hard below"strata,strata with large buried depth and fissure water de-velopment,and composite strata with rich water and good air tightness.There are few cases in which auxiliary pneumatic tunneling method is used in mud shield tunneling,in this paper,combined with the engineering char-acteristics of the large diameter shield project of Henan Intercity Railway,such as good air tightness of the clay layer in the whole section,we try to adopt the auxiliary pneumatic tunneling method of mud-water shield tunnel-ing method in the construction of clay layer,so as to deal with the problems such as the change of various param-eters caused by the mud cake,resulting in the deterioration of results and the reduction of construction efficien-cy,the probability of mud cake formation is effectively reduced,the construction efficiency is improved,and the reference significance is provided for the construction of large diameter mud-water shield in similar strata.
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