顶部溶洞水压对隧道突涌水灾害影响的数值分析

发布时间：2018-03-02 00:19

本文关键词： 岩溶隧道顶部溶洞溶洞水压突水通道安全厚度　出处：《隧道建设》2017年02期 　论文类型：期刊论文

【摘要】：岩溶地区地质条件复杂,在隧道修建中存在溶洞突涌水安全隐患,而顶部溶洞带来的灾害性更加明显,溶洞水压是其重要影响因素。针对隧道顶部溶洞,建立数值模型,将溶洞水压作为工况因素,分析围岩中的孔隙水压力变化规律,揭示隧道开挖过程中突涌水通道的分布情况。基于数值模型中单元孔隙水压力突变最大值判断方法,溶洞与掌子面围岩达到塑性状态后,监测两者之间的单元孔隙水压力随开挖步变化速率,找出每一行单元中的最大值,从而确定不同溶洞水压下的突水通道及安全厚度。研究表明,随着顶部溶洞水压增大,突水通道距离溶洞底部由近及远,而安全厚度也随之增大。
[Abstract]:The geological conditions in karst area are complex, and there is a hidden danger of water gushing in the tunnel construction, and the disaster caused by the top karst cave is more obvious. The water pressure of the karst cave is an important influence factor. A numerical model is established for the karst cave at the top of the tunnel. The variation of pore water pressure in surrounding rock is analyzed to reveal the distribution of water gushing channel during tunnel excavation. Based on the method of determining the maximum value of unit pore water pressure in numerical model, the variation of pore water pressure in the surrounding rock is analyzed. After the plastic state of the cavern and the surrounding rock on the face of the face is reached, the variation rate of pore water pressure between them with the excavation step is monitored, and the maximum value in each row of the unit is found out. The results show that with the increase of water pressure at the top of the cave, the water inrush passage is near and far away from the bottom of the cave, and the safe thickness increases with the increase of the water pressure of the top cave.
【作者单位】：武汉港湾工程质量检测有限公司;海工结构新材料及维护加固技术湖北省重点实验室;
【分类号】：U457.2

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