基于强度折减法的重力坝深层抗滑加固措施研究

发布时间：2018-04-08 09:44

本文选题：重力坝　切入点：抗滑稳定　出处：《地下空间与工程学报》2016年04期

【摘要】：对于重力坝坝基存在软弱结构面的抗滑稳定处理,工程实践中常采用混凝土硐塞置换或预应力锚索方案。为分析比较两种方案的处理效果,采用有限元方法,建立包含基岩内软弱结构面的三维模型,采用Drucker-Prager强度准则,考虑自重荷载、水荷载、扬压力、坝前淤沙压力,研究某水电站工程溢流坝段坝基深层抗滑稳定问题。在采用重力坝设计规范计算抗滑处理后安全系数相同的条件下,采用有限元通过强度折减的方法可计算得到不处理、硐塞置换方案与锚索方案3种不同工况下的破坏形态,采用等效塑性应变超过某一幅值作为判断材料是否进入塑性状态的指标,结合坝体位移随强度折减系数的变化曲线,判断坝基是否出现滑动,分析结果表明硐塞置换方案较锚索方案的安全裕度更大。
[Abstract]:In engineering practice concrete plug replacement or prestressed Anchorage cable scheme is often used to deal with the stability of the weak structural plane of gravity dam foundation.In order to analyze and compare the treatment effects of the two schemes, the finite element method is used to establish a three-dimensional model containing the weak structural plane in the bedrock, and the Drucker-Prager strength criterion is used to consider the gravity load, water load, uplift pressure and silt pressure in front of the dam.The problem of deep anti-slip stability of overflow dam foundation in a hydropower station is studied.Under the condition that the safety factor of gravity dam design code is the same after the anti-skid treatment, failure modes under three different working conditions such as cavern replacement scheme and anchor cable scheme can be calculated by using finite element method through strength reduction method.The equivalent plastic strain exceeding a certain amplitude is used as the index to judge whether the material enters into the plastic state or not, combining with the variation curve of the displacement of the dam body with the strength reduction coefficient, it is judged whether the dam foundation is sliding or not.The results show that the safety margin of the plug replacement scheme is greater than that of the anchor cable scheme.
【作者单位】：五凌电力有限公司;清华大学水沙科学与水利水电工程国家重点实验室;
【基金】：水沙科学与水利水电工程国家重点实验室课题(2013-KY-2)
【分类号】：TV698.23

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