深埋洞室岩体开挖卸荷诱导的围岩开裂机制

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Abstract For a case of circular deep tunnel，the effect of abrupt in-situ stress release in terms of cracking in surrounding rocks is investigated by adopting an initiation model of cracks under biaxial compressions. In addition，a formula of the stress intensity factor is employed. The results show that，compared to a quasi-static process of stress release，the transient release of in-situ stress on excavation face generates an additional dynamic stress in surrounding rocks. In this circumstance，the radial unloading and the circumferential loading are enlarged by this additional stress，thus cracking in surrounding rocks is aggravated during this transient process. The shorter the release duration of stress is，the greater the amplitude of the additional stress and the cracking extent become.

Key words： rock mechanics deep tunnel rock cracking blasting excavation transient release of in-situ stress

Received: 15 October 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I6/1222

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