基于3DEC的洞室开挖支护中错动带作用机制研究
发布时间:2019-05-19 20:45
【摘要】:西南某水电站泄洪洞上平段发育柱状节理玄武岩并被断层、错动带等不利结构面切割,具有断面大、地应力偏高、地质条件复杂的特征,尤其是以缓倾角为代表的错动带对地下洞室的影响不容忽视。结合左岸泄洪洞岩体物理力学及支护参数,采用3DEC三维离散元软件对错动带发育洞段开挖支护过程中洞室的应力场、位移场及塑性区进行了数值模拟,对开挖支护过程中应力应变变化特征进行了分析。模拟结果证明其支护方案可有效控制围岩的变形。
[Abstract]:Columnar joint basalt is developed in the upper section of flood discharge tunnel of a hydropower station in southwest China and cut by faults, staggered zones and other unfavorable structural planes, which has the characteristics of large section, high ground stress and complex geological conditions. In particular, the influence of dislocation zone represented by slow dip angle on underground caverns can not be ignored. Combined with the physical mechanics and support parameters of the rock mass of the flood discharge tunnel on the left bank, the stress field, displacement field and plastic zone of the tunnel during excavation and support in the staggered zone are simulated by using 3DEC three-dimensional discrete element software. The variation characteristics of stress and strain in the process of excavation and support are analyzed. The simulation results show that the support scheme can effectively control the deformation of surrounding rock.
【作者单位】: 中国地质大学工程学院;中国电建集团华东勘测设计研究院有限公司;菏泽瀚麟建筑设计院有限公司;
【分类号】:TV223
本文编号:2481049
[Abstract]:Columnar joint basalt is developed in the upper section of flood discharge tunnel of a hydropower station in southwest China and cut by faults, staggered zones and other unfavorable structural planes, which has the characteristics of large section, high ground stress and complex geological conditions. In particular, the influence of dislocation zone represented by slow dip angle on underground caverns can not be ignored. Combined with the physical mechanics and support parameters of the rock mass of the flood discharge tunnel on the left bank, the stress field, displacement field and plastic zone of the tunnel during excavation and support in the staggered zone are simulated by using 3DEC three-dimensional discrete element software. The variation characteristics of stress and strain in the process of excavation and support are analyzed. The simulation results show that the support scheme can effectively control the deformation of surrounding rock.
【作者单位】: 中国地质大学工程学院;中国电建集团华东勘测设计研究院有限公司;菏泽瀚麟建筑设计院有限公司;
【分类号】:TV223
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