The article analyses the mechanism and affected range of surface settlement around by excavation perviousness, and discusses the affecting factors and the measures to control it.

The Ground Soldier Ensemble will feature built-in equipment that allows Army team leaders to quickly access critical information about each other and their surroundings during a mission.

The quake struck Sichuan Province and neighboring regions at 2:28 p. m. on May 12, 2008, when Xue was having a chemistry class. The floor disappeared from under him and he fell into darkness.