地下洞室爆破开挖过程中地应力瞬态调整诱发节理围岩松动机制研究

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (12) : 28-34.

论文

地下洞室爆破开挖过程中地应力瞬态调整诱发节理围岩松动机制研究

孙金山1，2; 金李3; 姜清辉2; 周传波1; 卢文波2

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Study on the mechanism of jointed rock mass loosing caused by the transient adjustment of in-situ stress

SUN Jin-shan1，2; JIAN Qing-hui2; JIN Li3; Zhou Chuan-bo1;LU Wen-bo2

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摘要

针对中高地应力条件下节理岩体地下洞室的爆破开挖引发的节理松动问题，基于应力波理论建立了节理岩体的瞬态卸荷力学模型，证明了简单条件下节理卸荷松动效应的存在。其次，运用离散元数值模拟方法，研究了考虑地应力瞬态调整过程的圆形隧洞节理围岩松动过程。研究表明，地应力瞬态调整过程中，圆形隧洞岩体径向应力的调整过程较直接简单，而切向应力则较为复杂；洞壁附近的节理岩体中可能形成远大于静态塑性区的松动损伤区，使最终屈服区以外的节理面强度和渗透性等力学参数发生劣化；地应力瞬态调整将在节理岩体中诱发质点的振动，是节理面损伤的主要来源。

Abstract

The mechanism of jointed rock mass loosing caused by the transient adjustment of in-situ stress is analyzed. The Mathematical model to simulate the dynamic unloading process of jointed rock mass is induced. With this model it is found that the rock mass joints would loose when the normal stress unloaded transiently. And the loosing process of jointed rock mass in a circular tunnel is analyzed with distinct element method (UDEC 4.0). It is proposed that the radial stress of rock blocks adjustment process direct and simple, and tangential stress is more complicated. A loosing zone is formed in the jointed rock mass, which is probably much larger than the static plastic zone. The mechanical parameters of joints in the loosing zones such as strength and permeability are decrease. Transient adjustment of in-situ stress will induce the particle vibration, which is an important damage source of jointed rock mass.

导出引用

孙金山;金李;姜清辉;周传波;卢文波. 地下洞室爆破开挖过程中地应力瞬态调整诱发节理围岩松动机制研究[J]. 振动与冲击, 2011, 30(12): 28-34

SUN Jin-shan;JIAN Qing-hui;JIN Li;Zhou Chuan-bo;LU Wen-bo. Study on the mechanism of jointed rock mass loosing caused by the transient adjustment of in-situ stress[J]. Journal of Vibration and Shock, 2011, 30(12): 28-34