Research purposes: Aims at the ground movement distribution and transformation during parallel shield tunnel construction,infections on the ground movement value due to effective factors(such as surrounding soil condition,tunnel covering thickness,clear distance and advance force etc) are also probed in.

In this paper, the authors introduce a method of calculating transverse sight distance of a random point which belongs to plane curve.

Several main issues such as withstand voltage correction,equipment external insulation,air clearance,creepage distance and pollution influence,are discussed in this paper by taking an example for external insulation design of Xingren converter station.

In order to research the median safety lateral clearance of expressway,the speed data of overtaking lane and respective inside clearances data of vehicles were collected on some typical sections expressways.

Numerical simulation of construction sequence for shallow embedded bias tunnels with small clear distance;

Numerical simulation of blasting control for small clear distance zone of Dongjiashan tunnel;

On construction method optimization of small clear distance tunnel