Besides,timely measures are selected to deal with sudden large-scale piping because connectors are formed by exploration hole under backfilling not according to the requirements during the process of construction.

Prevention and control of water seepage and sudden water inrush during tunneling;

Application of BP neural network to assessment of noncohesive piping-typed soils;

The occurrence of large abrupt events seriously affects public security and normal social order and endangers people s life and property safety.

The paper pointed out that a tube inrush type failure could be occurred in the soil mass of the Quaternary aquifer and had been approved when the mining cracks and primary cracks reached the Qua.

Critical bottom thickness calculation of foundation pit in inrushing of soil and water;