| 叶健,秦忠国,万乾山.关于坡脚水力坡降奇异性的研究[J].水利学报,2002,33(2):0075-0079 |
| 关于坡脚水力坡降奇异性的研究 |
| On singularity of seepage hydraulic gradient of earth dam |
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| DOI： |
| 中文关键词: 渗流 水力坡降 堤防 有限元 |
| 英文关键词: seepage hydraulic gradient earth dam downstream slope sigularity FEM |
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| 中文摘要: |
| 根据现行计算方法, 堤坝下游坡脚处渗流水力坡降具有奇异性, 这给工程设计中判别渗透安全性带来困难, 同时与实际情况也不符合. 本文通过引入坡面与地面的局部连接段对计算区域进行光滑处理, 消除了问题的奇异性质, 进而用有限元数值方法研究了引入连接段之后坡脚水力坡降的分布, 总结出不同坡比情况连接段长度(或接段半径)对最大水力坡降的影响. 建议在对堤坝进行渗透稳定评判时, 按实际情况考虑连接段长度, 可避免目前计算方法在坡脚水力坡降为无穷大带来的困难. 关于连接段长度的选取, 认为与土质有关, 可到实地搜集有关数据, 整理成与各种土质有关的连接段特征高度供设计选用. |
| 英文摘要: |
| The singularity of hydraulic gradient, which is always found in the calculation of seepage at the toe of dam, is not accord with the reality and makes the trouble in judging the safety of the dam. A transition curve connecting the slope and ground is proposed to smooth the calculation of the transition zone and to avoid the happening of sigularity. FEM is applied to study the distribution of hydraulic gradient at the toe in case the transition curve is existed. The effects of curve length and its radius on maximum hydraulic gradient are investigated. It is found that the length of transition curve is closely related to the characteristics of the soil. |
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