深埋长隧洞三维地质力学模型试验研究

发布时间：2018-01-14 12:28

  本文关键词：深埋长隧洞三维地质力学模型试验研究　出处：《工程地质学报》2017年02期 　论文类型：期刊论文

  更多相关文章： 三维地质力学模型试验 深埋长隧洞 三维弹塑性有限元 围岩 相似材料

【摘要】：为了评价深埋长隧洞围岩的稳定性和隧洞间距的合理性,本文采用三维地质力学模型试验技术,研究在高地应力、高外水压力作用下,隧洞围岩整体稳定性以及相邻洞室开挖的相互影响效应,并与三维弹塑性有限元数值计算结果进行对比验证,研究结果表明:地质力学模型试验成果和数值计算结果基本一致,两者得到的位移场、应力场、屈服区范围都基本吻合。在高地应力、高外水压力作用下,工程所在的Ⅲ类围岩隧洞是可以安全成洞的。采用超载法进行试验和计算可知,在Ⅲ类围岩中极限超载安全系数k1.3,开挖隧洞对洞周围岩的位移与应力影响区一般小于1倍洞径范围,隧洞的间距是合适的。
[Abstract]:In order to evaluate the stability of the surrounding rock and the rationality of the tunnel spacing, the three-dimensional geomechanical model test technique is used to study the effects of high ground stress and high external water pressure. The overall stability of surrounding rock and the interaction effect of adjacent cavern excavation are compared with the three-dimensional elastoplastic finite element numerical results. The results show that the results of geomechanical model test and numerical calculation are basically consistent, and the displacement field, stress field and yield zone range are basically consistent with each other under the action of high ground stress and high external water pressure. The tunnel of type 鈪，

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