[2] RAJESH T. Trenchless technology. Alternative to traditional construction district energy[J]. 1994,80(1):12-18.
[3] LUEKE J S,ARIARATNAM S T. SIMAAN M. abourizk,Application of simulation in trenchless renewal of underground urban infrastructure[J]. Winter Simulation Conference Procecdings, 1999, (2): 929-936.