吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (5): 1578-1586.doi: 10.13278/j.cnki.jjuese.20200283
潘维强1, 张黎明2, 丛宇2
Pan Weiqiang1, Zhang Liming2, Cong Yu2
摘要： 为了解决深厚松散地层预防性治理后竖井井筒缺乏破坏判据问题，用数值极限应变方法分析井筒应变值的变化情况，将井筒中达到极限应变值的单元环向贯通，计算不收敛作为井筒整体破坏判别标准。分别建立了带卸压槽和无卸压槽井筒的数值计算模型，得出地下水水位下降诱发的井筒和周围岩土体的极限应变值。结果表明，井筒周围砂土层先于井筒在181~183 m发生破坏：若地下水水位下降27 m，无泄压槽井筒在181~182 m发生破坏；若地下水水位下降38 m，带卸压槽井筒在182~183 m发生破坏。目前地下水水位下降为20 m，井筒处于安全状态。数值计算卸压槽压缩量与实际监测值一致。
中图分类号:
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