Evolution characteristics analysis of temperature - stress field in the early stage of borehole precast construction in western China

Abstract

In order to prevent the crack phenomenon of prefabricated shaft lining wall construction in winter in western China, the evolution characteristics of temperature-stress field in the early stage of prefabricated shaft lining wall construction were studied. Firstly, based on FLAC3D software, a numerical analysis model of early temperature-stress field of inner steel sheet concrete composite shaft lining wall structure was established based on the well drilling project of central return air shaft by drilling method in Kekegai Coal Mine in western China. By simulating the field construction conditions, the distribution law of early temperature stress of shaft lining wall is obtained, and the high risk area prone to early temperature cracks is determined. Then, according to the simulation results, the range analysis method is used to obtain the influence factors of the early temperature stress of the precast shaft lining wall from large to small: convective heat dissipation coefficient, ambient temperature, concrete strength grade; the field measurement results show that the simulated temperature distribution is in good agreement with the engineering measurement. The research results can provide technical support for prevention and control of prefabricated shaft lining wall construction cracks in winter in western China.

Keywords

• prefabricated shaft lining wall
• early temperature stress
• numerical simulation
• temperature field
• evolutionary character