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Design and analysis of foundation modifications for a buttress dam

机译:支撑坝基础改造设计与分析

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A spillway stilling basin was originally excavated downstream of several buttresses at Pueblo Dam. Geologic information indicated the presence of weak shale seams in the foundation that daylight in the stilling basin excavation. The reservoir had not filled completely since original construction, and therefore the foundation was not fully tested. Analyses indicated the foundation could have a very slim margin of safety if the reservoir filled to normal levels. Due to the large population at risk downstream from the dam, there was strong justification to reduce the risk, and modifications were undertaken to improve foundation stability. The modifications consisted of buttressing the foundation with roller-compacted concrete (RCC) and rock bolts. Additional drainage was also installed. Although the design was completed using limit equilibrium techniques, unique aspects of the geometry were investigated using UDEC and DDA analyses. Both confirmed the design provided adequate resistance. This paper focuses on the design and analysis of the foundation treatment system.
机译:溢洪道消静池最初是在普韦布洛大坝的数个支柱下游开挖的。地质信息表明,在静止盆地开挖中,白天存在基础薄弱的页岩接缝。自原始建筑以来,该水库尚未完全填满,因此该基础尚未经过全面测试。分析表明,如果水库注水到正常水平,地基的安全边际可能很小。由于大坝下游有大量人口处于危险之中,因此有充分的理由来降低风险,并进行了修改以提高地基的稳定性。修改包括用碾压混凝土(RCC)和锚杆支撑基础。还安装了额外的排水装置。尽管使用极限平衡技术完成了设计,但是使用UDEC和DDA分析研究了几何的独特方面。两者都确认设计提供了足够的抵抗力。本文着重于基础处理系统的设计与分析。

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