High Speed Railway Environment Safety Evaluation Based on Measurement Attribute Recognition Model

Table 1

High speed railway mechanism analysis of environmental impact factors.

Environmental factor	Mechanism
Rainfall	(i) Raining is the foremost factor that is easily causing line fault. Additionally, the current flow will emerge between the pantograph and overhead line systems of the high speed railway when it comes to a heavy rainy day and the train power supply will also be consequently influenced.; (ii) Rainfall can cause mountain soil landslides that will directly lead to the abnormal operation of the train.
Cross wind	(i) The mechanism of the influence caused by horizontal wind on the high speed railway is that it can produce the yawing force which will allow the lateral migration. Moreover, the produced lift force will lead to the train derailment through the pneumatic action with the high speed train, which will undeniably increase the risk of train being derailed.
Lightning	(i) Lightning can disrupt the power supply of the high speed railway train traction which will result in the sudden stop of the high speed rail train through breaking down the high speed railway along the circuit devices.
Earthquake	(i) Earthquake wave can be divided into two kinds: the P wave (primary wave, pressure wave) and the S wave (secondary wave, shear wave). S wave can destroy the building structure and cause the landslides, orbital shift, and train wheel derailment which will influence the safe driving of high speed railway.
Temperature	(i) High temperature can lead to a big temperature difference between the internal and external, the increase of air conditioning power, and the aggravation of the train power supply load. Besides, high temperature can cause the short circuit because of the softened line.; (ii) Cold damp climate will lead to the ice covering membrane on the railway track, which will reduce the friction between train and track and increase the risk of a derailment when the train is at high speed turning.
Snowfall	(i) A lot of snow will cover the track and the ice on the track will increase the degree of danger of the train operation.