高应力隧洞岩爆倾向性预测与预防措施研究

发布时间：2018-01-07 11:22

本文关键词：高应力隧洞岩爆倾向性预测与预防措施研究　出处：《西安科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：在深埋地下工程中,由于高地应力和复杂的地质条件,因而隧道和洞室开挖都会发生岩爆的现象,破坏设备,影响施工进度,甚至威胁施工人员安全。本论文结合某隧道的实际情况,以此为主要的工程背景,展开对工程中的岩爆倾向性预测和防治措施研究。(1)本章根据某隧道的实际地质情况,对全线十种状态数值模拟研究。采用FLAC3D有限差分软件,模拟了不同围岩等级和埋深条件下隧道应力变化,依选取Russense判据评价了某隧道全线的岩爆倾向性,得到结论:某隧道全线岩爆现象发生的区域。在各状态下主压应力洞周切向应力的最大值位置大体一致。这些峰值分布的位置,主要以起拱处偏上部位及隧道拱顶处为主。(2)模拟了岩石性质参数中弹性模量、黏聚力和内摩擦角对岩爆倾向性的敏感性,基于状态九,得到结论:随着弹性模量不断的增大,而是先增大然后减小的过程;随着黏聚力不断的增大,岩爆是先增大后减小不断反复循环的过程;随着内摩擦角在35°～45°之间,岩爆倾向性指标以非常小的程度在不断的增加,在50°达到峰值之后,开始不断减小的过程。(3)利用正交模拟实验,对岩石性质参数中弹性模量、黏聚力和内摩擦角对岩爆倾向性的权重变化进行了分析,得到结论:因素C(内摩擦角)在水平3对岩爆倾向性指标的影响最大,尤其是从水平2到水平4,岩爆倾向性指标增加显著;而因素A(弹性模量)对岩爆倾向性指标的影响程度次之,因素B(黏聚力)增大变化对岩爆倾向性指标的影响最小。(4)根据隧道的实际情况,结合预测和岩石性质参数的分析,在可能发生强岩爆区和可能发生中等岩爆区提出具体的防治手段来确保隧道安全施工。
[Abstract]:Because of the high ground stress and complex geological conditions in the deep buried underground engineering, the rock burst will occur in the excavation of tunnels and caverns, which will destroy the equipment and affect the construction progress. Even threaten the safety of construction personnel. This paper combined with the actual situation of a tunnel, taking this as the main engineering background. In this chapter, according to the actual geological conditions of a tunnel, the numerical simulation of ten states of the whole line is studied. FLAC3D finite difference software is used. The variation of tunnel stress under different surrounding rock grade and buried depth is simulated, and the rockburst tendency of a tunnel is evaluated according to Russense criterion. It is concluded that the maximum position of the tangential stress around the main compressive stress hole is approximately the same in the region where the rockburst occurs in the whole line of a tunnel, and the location of these peak distributions. The sensitivity of elastic modulus, cohesion force and angle of internal friction to the tendency of rock burst in rock property parameters is simulated by the upper part of the arch and the arch of tunnel, based on state 9. The results show that the elastic modulus, the cohesion force and the angle of internal friction are sensitive to the tendency of rock burst. It is concluded that with the increasing of elastic modulus, the elastic modulus increases first and then decreases. With the increasing of cohesive force, rock burst is the process of increasing first and then decreasing repeatedly. With the internal friction angle between 35 掳and 45 掳, the rockburst tendency index increases continuously to a very small extent and reaches the peak value at 50 掳. By using orthogonal simulation experiment, the weight changes of elastic modulus, cohesion force and internal friction angle on rock burst tendency in rock property parameters are analyzed. It is concluded that the factor C (angle of internal friction) has the greatest influence on the rockburst tendency index at level 3, especially from level 2 to level 4, the rockburst tendency index increases significantly. The influence of factor A (elastic modulus) on the rockburst tendency index is the second, and the influence of factor B (cohesion) on the rockburst tendency index is the least. 4) according to the actual situation of the tunnel. Combined with prediction and analysis of rock property parameters, concrete prevention measures are put forward to ensure tunnel safe construction in areas where strong rockburst and moderate rockburst may occur.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU45

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