西部地区钻井井壁预制施工早期温度-应力场演化特征分析

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

    • 摘要: 为防止西部地区预制钻井井壁冬季施工出现裂缝现象,开展了钻井井壁预制施工的早期温度-应力场演化特征研究。首先,以西部地区可可盖煤矿中央回风立井钻井法凿井工程为背景,基于FLAC3D软件,建立了内层钢板混凝土复合钻井井壁结构早期温度-应力场数值分析模型。通过模拟现场施工工况,获得了井壁早期温度应力的分布规律,确定了易出现早期温度裂缝的高风险区;然后,根据模拟计算结果,采用极差分析方法,获得预制钻井井壁早期温度应力影响因素从大到小依次为:对流散热系数、环境温度、混凝土强度等级。现场实测结果表明:模拟计算得到的温度分布规律与工程实测较为一致。

       

      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.

       

    /

    返回文章
    返回