【作者】 杨宗宝；

【导师】 尹健民；

【作者基本信息】 长江科学院 ， 岩土工程， 2017， 硕士

【摘要】 初始应力场是深埋隧道等地下工程建设的重要地质条件之一,在深埋高应力条件下,硬脆性岩体中发生岩爆的可能性较高,极易带来较大的危害。本文通过对福堂隧道进行地应力测试和应力场回归反演分析,得到了整个工程区的地应力分布特征。在此基础上,以易于发生岩爆的深埋隧道为研究背景,综合运用理论分析、数值模拟等手段,分析了影响岩爆的应力指标,研究了不同侧压系数与潜在岩爆之间的关系以及最大水平主应力与洞轴线不同夹角与潜在岩爆的关系。最后,结合经典的岩爆判据,对福堂隧道沿线进行了岩爆预测并分析了锚喷支护的岩爆防治效果。本论文的主要研究内容如下:1、采用三孔交汇水压致裂法对深埋隧道进行了现场地应力测试,在地应力实测数据的基础上,结合隧址区工程地质资料,对隧道地应力场进行回归反演分析,得到了整个工程区域内的地应力场分布规律。2、基于脆性岩体的强度破坏准则,分析了影响岩爆的应力指标,计算了特定应力条件下诱导岩爆发生的弹性应变能的积聚深度,并研究了不同侧压系数与潜在岩爆之间的关系以及最大水平主应力与洞轴线不同夹角与潜在岩爆之间的关系。3、根据侧压系数和最大水平主应力与洞轴线夹角对岩爆的影响关系,结合经典岩爆判据,对隧道沿线岩爆易发区段和洞壁易发位置进行了预测,并与岩爆现场统计结果对比,最后研究了喷锚支护的岩爆防治效果。更多还原

【Abstract】 The in-situ stress field is one of the important geological conditions for underground engineering such as deep tunnel.Under the condition of deep buried high stress,the possibility of rock burst in hard brittle rock is higher,and it is easy to cause great harm.In this paper,the stress distribution of the whole project area is obtained by the stress test and the regression analysis of the stress field.On this basis,the Futang tunnel rock burst disaster as the research background,the integrated use of theoretical analysis,laboratory experiment and numerical simulation,studied different lateral pressure coefficients and the maximum horizontal principal stress correlation between different angle and rock burst stress and the tunnel axis.Finally,combined with the classical criteria of rock burst,rock burst prediction along the Fu Tong tunnel is carried out,and the control effect of rock bolt blasting is analyzed.The main contents of this paper are as follows:1.The intersection of three hydraulic fracturing method of deep buried tunnel carried out in-situ stress test,based on the measured geostress data,combined with geological information engineering tunnel,the tunnel stress field regression analysis,obtained the stress distribution within the project area.2.Based on the results of brittle rock mass strength failure criterion and indoor rock mechanics test,the numerical simulation analysis of the accumulation depth specific stress conditions induced by rock burst occurrence of elastic strain energy,and the effects of different lateral pressure coefficient and maximum horizontal correlation between stress and the tunnel axis is not the same between angle and rock burst.3.According to the coefficient of lateral pressure and the maximum horizontal principal stress and the tunnel axis angle of rock burst,combined with the classic rock burst criterion of tunnel rock burst prone sections along the wall and prone position were predicted and studied the shotcrete supporting rock burst prevention effect.更多还原