Due to adit construction,the research demonstrates the disadvantageous distribution of deformation and internal forces in intersection of adit and main tunnel,particularly in its side-wall connected to the adit.

The reasons for accidents involving damage to gas pipeline caused by constructions are analyzed,the specific method of side-standing for construction of gas pipeline is introduced,and the role and effect of this method is described.

Following a thermal and flue duct resistance calculation,a variety of improvement measures,such as additional provision of a bypass flue duct and an economizer as well as the use of a XD-2000 type gas impulse soot blower,were implemented.

Combining the freezing method construction of side channels of the test section of Nanjing subway, authors analyze and conclude some technical problems and countermeasures of the freezing method in different construction stages such as construction of freezing pipes, frezzing, excavation and so fort.