地下工程围岩稳定性的温度效应分析与应用
发布时间：2018-11-06 20:56
【摘要】：随着工程技术水平的不断提高,资源开发、水利、交通等与地下工程密切相关事业的飞跃发展,地下工程的空间与数量在日益增多。地下工程不可避免受到温度的影响,地下高温不仅影响工程施工安全和进度,而且由于产生的附加温度应力还将引起衬砌开裂,从而影响隧洞的稳定性。本文结合孔庄煤矿和赵楼煤矿的实地数据,对其进行计算机回归分析,从而获得不同矿井的地温梯度。经过分析可知:赵楼煤矿平均地温梯度G=5.23℃/100m,孔庄煤矿平均地温梯度G=0.49℃/100m,比较两个煤矿得出由于岩性不同有不同的地温梯度。通过对孔庄煤矿工作面监测,得出7432工作面监测实际最大变形量为26mm,7435溜子道监测实际最大变形量为16mm,实际测量应力最大值为6.7MPa。充分考虑现场的具体情况,运用有限元软件ANSYS对地下巷道围岩温度变化进行模拟,得到20℃~35℃的温度场分布;得到20℃~35℃的热应变分布情况,最大热应变为0.496mm;得到20℃~35℃热应力分布情况,最大应力为1.84MPa;得到20℃~35℃热-力耦合模拟的分布情况,最大变形量为31.038mm。由于采取了通风等降温措施,使得实际测量值小于理论计算值。通过理论计算和实际监测情况综合对比,在实际的工程应用中,应控制工程环境的温度来影响围岩的温度,进而使围岩稳定性的温度效应在能够可接受的范围之内。通过本文分析,结合数值模拟结果,得出了孔庄煤矿和赵楼煤矿的地温梯度,讨论了不同温度下的围岩稳定性,为地下工程的施工防护提供参考。
[Abstract]:With the continuous improvement of engineering technology and the rapid development of resources exploitation, water conservancy, transportation and other closely related undertakings, the space and quantity of underground engineering are increasing day by day. The underground engineering is inevitably affected by the temperature. The underground high temperature not only affects the construction safety and progress of the project, but also causes the lining cracking due to the additional temperature stress, thus affecting the stability of the tunnel. Based on the field data of Kongzhuang coal mine and Zhaolou coal mine, computer regression analysis is carried out to obtain the geothermal gradient of different mines. Through the analysis, we can know that the average geothermal gradient of Zhaolu coal mine is 5.23 鈩，
本文编号：2315450
[Abstract]:With the continuous improvement of engineering technology and the rapid development of resources exploitation, water conservancy, transportation and other closely related undertakings, the space and quantity of underground engineering are increasing day by day. The underground engineering is inevitably affected by the temperature. The underground high temperature not only affects the construction safety and progress of the project, but also causes the lining cracking due to the additional temperature stress, thus affecting the stability of the tunnel. Based on the field data of Kongzhuang coal mine and Zhaolou coal mine, computer regression analysis is carried out to obtain the geothermal gradient of different mines. Through the analysis, we can know that the average geothermal gradient of Zhaolu coal mine is 5.23 鈩，
本文编号：2315450
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