关键词: 熔岩管, 火山灾害, 热应力, 有限元计算

Abstract:

In addition to the direct disasters during the volcano eruption, some lava tubes often form in the course of the flow of basic magma. The existence of underground empty caves near the lava tubes reduces the stability of the earth's surface, and then secondary disasters may happen. The lava tubes found on the Moon and Mars not only can be used for further research, but also have been proved to be the best places to build detection base in future. Using the finite element method and based on the formation of the lava tubes, we establish the temperature evolution and the corresponding displacement and thermal stress field conditions. Furthermore, we determine the effects, on the stability of the lava tubes, of different physical parameters (the lava tube size, depth, and shape) by means of analyzing the evolution course of the principal stress.

Key words: lava tubes, volcanic hazard, thermal stress, finite element method calculation