MAIN GEOLOGY DISASTERS TYPE OF LOESS TUNNEL

Loess is considered a kind of mainland loose accumulation in the Quaternary Period in the paper.The Loess tunnels obviously have the loess engineering characteristic.The basic actors,which are Particulate matter,Moisture content,Microstructure,Interstitial,Clay content,Manual work,determine the basic loess engineering characteristic.The water gum consociation is the main coupling form of the loess particulate,which give the very high strength in loess when loess is dry,but the coupling weakens after meeting water and the strength lowers.This is the main cause which makes loess wet collapsing. Physics geology functions,earthquake functions,the functions of water with synthesize functions are the main creation of engineering geology disasters in tunnel in loess.The water seriously impair to the loess tunnel.