Unstable rock is a kind of global geological disaster with high frequency. This paper, considering three kinds of combined loads which are gravity, fracture water pressure and seismic force, constructs a unstable rock mechanics model and it uses a fracture mechanics method to deduce the composite stress intensity factor of the type I -II. Based on the maximum circumferential stress theory, this article calculates the theoretical fracture angle by triangle universal formula.
LNG tank has extremely low operating temperature, hazardous storage medium and large capacity storage space, therefore it is necessary to carry out temperature field analysis for LNG tank under Ultra-low temperature, and the temperature of LNG tank under Ultra-low temperature is simulated based on finite element method. Firstly, the finite element model of temperature field is analyzed. Secondly, the simulation parameters of LNG tank under Ultra-low temperature are given. Finally, the simulation results are carried out, and the temperature field of LNG tank under Ultra-low temperature is obtained.
Abstract. The explosive risk evaluation of LPG tank under fire is important for putting forward the safety measurement, in order to improve the evaluation correctness, and the fisher fishing algorithm and the grey relational analysis are applied in it. Firstly, the explosion characteristics of LPG tank under fire are discussed. Secondly, the basic theory of fisher fishing algorithm and grey relational analysis are studied. Thirdly, explosive risk evaluation simulation of LPG tank under fire are carried out based on the comprehensive algorithm, and results show that new evaluation method can evaluate the explosive risk of LPG under fire effectively.
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