Dam & Safety ›› 2019, Vol. 0 ›› Issue (2): 27-.

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Operational behavior and safety evaluation of highly weathered mudstone dam foundation

WANG Zhen, CHEN Guo-liang, TANG Yang, LIU Shi-huang and WANG You-chun   

  1. Large Dam Safety Supervision Center, National Energy Administration
  • Received:2019-01-14 Revised:2019-01-28 Online:2019-04-08 Published:2019-04-08

强风化泥岩坝基运行性态及安全评价

汪 振1,2,陈国良2,汤 旸1,刘世煌,王友春3   

  1. 1. 国家能源局大坝安全监察中心,浙江 杭州,311122;2. 华东勘测设计研究院有限公司,浙江 杭州,311122;3 大唐雅安电力开发有限公司,四川 雅安,625000
  • 作者简介:汪 振(1980- ),安徽肥西人,高级工程师,主要从事水工建筑物设计及大坝安全管理工作。

Abstract: The dam foundation of a hydropower station in Sichuan province is mainly placed on the cretaceous highly weathered mudstone (also known as consolidated clay). The mudstone has a compressive strength of 0.58 MPa under natural condition, which contains dissolved holes and caves formed by strong expansive rock, gypsum and mirabilite. Consolidation grouting, steel beam anchoring and other measures are adopted in dam foundation treatment. The dam has been in operation for more than ten years and no obvious deterioration of dam foundation is found. Due to the similarity and difference between the highly weathered mudstone and rock, the mechanical parameters of the highly weathered mudstone are difficult to determine. Moreover, there is not much experience in dam construction on the foundation like this. Therefore, it is necessary to summarize the operation of dam foundation and provide reference for similar projects.

Key words: dam foundation, highly weathered mudstone, operation

摘要: 四川某水电站坝基主要置于白垩系强风化泥岩(又称固结粘土)之上,天然状态下抗压强度0.58 MPa,该岩体间含强膨胀岩土、石膏及芒硝形成的溶孔和溶穴。坝基采用固结灌浆、钢筋束锚固等措施。大坝已正常运行十余年,目前未发现坝基明显恶化等现象。鉴于强风化粘土岩似岩非岩,力学参数很难测定,在此类基岩上的闸坝建设经验不多,因此,总结该水电站坝基运行情况十分必要,也可为类似工程提供参考。

关键词: 坝基, 风强化泥岩, 运行