条带式Wongawilli开采煤柱系统突变失稳机理及工程稳定性研究

发布时间：2018-06-26 09:20

  本文选题：条带式Wongawilli + 煤柱失稳　； 参考：《煤炭学报》2016年07期

【摘要】：对于条带式Wongawilli新型减沉开采技术,煤柱失稳直接导致地表沉陷,影响建(构)筑物的安全,采用突变理论和损伤本构方程,建立了采硐间狭窄煤柱和条带煤柱失稳的尖点突变模型。计算分析了条带式Wongawilli开采煤柱系统工程稳定性及突变影响参数,得出了窄煤柱与条带煤柱的突跳压缩量计算公式,通过工程实例计算与数值模拟验证了结果的合理性。研究结果表明:采硐狭窄煤柱满足突变失稳的必要条件,其所受载荷、屈服刚度和峰值载荷压缩量决定着突变的发生;当采高在2~6 m变化时,采留宽度比需控制在0.16~0.75,才可保证系统不产生突变失稳。条带煤柱保持稳定则要求其核区率大于17%,在弹塑性区宽度比小于0.21的情况下,条带煤柱可能发生突变失稳。
[Abstract]:For the new type of strip Wongawilli mining technology, the instability of coal pillar directly leads to the subsidence of the ground, which affects the safety of the building (construction). The catastrophe theory and the damage constitutive equation are adopted. A cusp mutation model for instability of narrow pillar and strip pillar between coal caverns is established. The engineering stability and sudden change influence parameters of strip Wongawilli coal mining pillar system are calculated and analyzed. The formula of sudden jump compression of narrow coal pillar and strip coal pillar is obtained. The rationality of the result is verified by engineering example calculation and numerical simulation. The research results show that the cavern narrow coal pillar satisfies the necessary condition of sudden instability, and its load, yield stiffness and peak load compression amount determine the occurrence of sudden change, and when the mining height changes at 2 ~ 6 m, The ratio of mining width to retaining width should be controlled at 0.16m 0.75 in order to ensure that the system does not produce sudden instability. If the width ratio of elastic-plastic zone is less than 0.21, the stripe pillar may lose its stability.
【作者单位】： 河南理工大学能源科学与工程学院;煤炭安全生产河南省协同创新中心;河南理工大学土木工程学院;
【基金】：国家自然科学基金资助项目(51374092) 国家自然科学煤炭联合基金重点资助项目(U1261206)
【分类号】：TD32
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本文编号：2069903