地下混凝土筒仓仓壁力学性能工程试验与数值分析
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TU926

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国家自然科学基金(51509084);粮食公益性行业科研专项(201413007-01)


Engineering test and numerical analysis of underground concrete silo
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    摘要:

    地下粮仓可充分利用地下空间,具有较好的防火、防毒、防爆等性能,并能利用浅层地能实现准低温储粮,具有节能、低损、保证粮食品质的优点,对保障粮食安全及可持续发展意义重大。采用工程足尺试验与数值分析相结合的研究方法,对大型地下混凝土筒仓竣工验收前仓壁的力学性能进行研究,通过对比试验结果与数值模拟结果,验证数值分析方法的合理性与有效性,进而对仓壁在最不利荷载工况下的力学性能进行数值分析。结果表明:地下混凝土筒仓仓壁内力的数值模拟结果与试验结果吻合较好;由于仓壁较厚且与仓底和仓顶间接触部位刚度较大,导致仓壁内外侧径向应力表现出相反的变化规律;仓壁径向应力在仓壁底部位置处最高,环向应力在距仓壁顶部约2/3位置处最高;在最不利荷载工况下,仓壁径向应力和环向应力随深度表现出与实际工况下相似的变化规律,且相同深度下应力较大。

    Abstract:

    The underground silos can take full advantages of the underground space, which is of better fireproof, anti-toxicity, explosion-proof and other merits. In the meantime, the underground silos can use the shallow geothermal energy to realize quasi-low temperature storage. With the advantages of energy-saving, low-consumption and grain quality-ensuring, it plays a significant role in ensuring the grain safety and sustainable development of China. The mechanical properties of the silo wall before completion acceptance of large underground concrete silos were studied by the combination of engineering full-scale test and numerical analysis. By comparing the test results with the engineering-scale testing results,, the rationality and effectiveness of the numerical analysis method were verified. Furthermore, the mechanical properties of the silo wall under the most unfavorable load conditions were numerically analyzed. The results show that the internal forces of the numerical simulation results of the silo wall were in good agreement with that of experimental results. Due to the relatively large thickness of the silo wall, and the rigidity of the contact part between the silo wall and the silo bottom and the silo roof, the radial stress on the inside and outside of the silo wall shows the opposite law. The radial stress of the silo wall is highest at the bottom of the silo wall, and the hoop stress is highest at about 2/3 of the position from the top of the silo wall. Under the most unfavorable load conditions, the radial stress and hoop stress of the silo wall show similar changes with the burial depth as in the actual working condition, and the stress is greater at the same depth.

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金立兵,梁新亚,霍承鼎,王振清,王珍.地下混凝土筒仓仓壁力学性能工程试验与数值分析[J].土木与环境工程学报(中英文),2020,42(3):40-45.

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  • 收稿日期:2019-07-19
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  • 在线发布日期: 2020-06-13
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