Research Review of Urban Deep Underground Space Use and Thoughts for Its Planning

The scale of urban underground space use is getting larger, and the utilization of shallow underground space in central areas of some cities is even saturated, and the demand for deep underground space is becoming stronger. At the same time, the progress of underground project construction technology has made it possible to use deep underground. Urban deep underground space use at home and abroad is reviewed. Since deep underground space use take place first in the downtown area of the city, followed by a gradual movement to the city’s periphery, and planning plays the important role of strategic guide and rigidity control, and is highest priority task for deep underground space use, and the three issues are proposed at planning level which are "unclearing for scientific law of using premise", "unknowing for using patterns and criteria" and "being uncertain forquantitative indicators of controlling and guidance".