复杂条件下高拱坝应力及坝肩稳定分析

摘要/Abstract

摘要： 众所周知，研究复杂地质条件下的高拱坝应力和坝肩稳定对确保工程安全具有重要的意义。研究的江坪河高拱坝地质构造较复杂，坝基及坝肩岩体存在大量断层、软弱夹层、泥化夹层和卸荷、风化岩体等地质缺陷，引起两岸坝肩岩体变形不对称、压缩变形量增大以及坝肩局部岩体承载能力低，直接影响到拱坝正常运行和稳定性。因而，对各种工况下的坝体及坝肩岩体进行了三维有限元分析，研究了坝体及坝肩的应力和变形发展状态、可能失稳模式、破坏形态和破坏机制。研究成果表明，未加固时坝肩岩体不稳定，因此，通过研究采用合理的加固处理措施，右岸采用6个传力洞进行加固；左岸采用锚洞进行加固。采取加固措施以后对其进行三维有限元分析，其研究成果表明，加固有一定的效果，改善了两岸的受力状况和变形分布，提高了坝肩稳定性，但左岸坝肩仍不能完全满足规范要求，还需要进一步增加锚洞的面积。

关键词: 拱坝, 稳定, 复杂条件, 三维有限元分析, 传力洞, 锚洞

Abstract: It is well known that study on stress and abutment stability of high arch dam under complex environment plays an important role in dam construction and operation successfully. High arch dam studied in the paper will be constructed in a complex geological site, where a large number of faults, altered rock, mantle rock existing in the dam foundation and abutment, which will yield asymmetrical displacement in both abutments, increasing compression deformation and bearing capacity limit of abutment so as to influence normal operation state and decrease stability of dam abutment. Then 3-D finile element analysis is applied to the arch dam and abutment under different operation modes, studying stress and displacement of dam and dam abutment corresponding to their distributing features, and analyzing possible failure pattern, process and mechanism. The results illuminate the arch dam is instable when unreinforced; so reasonable reinforcement measures are adopted in the arch dam including six actuating holes in the right dam abutment and anchor holes in the left dam abutment. And then 3-D finile element analysis is applied to the arch dam and abutment after reinforcement, of which results show that the reinforcement is effective for the arch dam stability, which improves stress and displacement distribution conditions in connection with stability of abutment rock; but the left dam abutment is still instable so as to add anchor holes area to ensure the arch dam stability.

Key words: arch dam, stability, complex conditions, 3-D finile element analysis, dowel holes, anchor holes

中图分类号:

TU 454

刘先珊，周创兵，王军 . 复杂条件下高拱坝应力及坝肩稳定分析[J]. , 2008, 29(1): 225-229.

LIU Xian-shan , ZHOU Chuang-bing , WANG Jun . Stress and stability analysis of high arch dam under complex conditions[J]. , 2008, 29(1): 225-229.

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