Research on dam abutment reinforcement effect of Jinping arch dam based on geomechanical model test

YANG Bao-quan; CHEN Yuan; ZHANG Lin; DONG Jian-hua; CHEN Jian-ye

doi:10.16285/j.rsm.2015.03.028

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Research on dam abutment reinforcement effect of Jinping arch dam based on geomechanical model test

更新时间：2026-06-25

- Research on dam abutment reinforcement effect of Jinping arch dam based on geomechanical model test
- Vol. 36, Issue 3, Pages: 819-826(2015)
- 作者机构：
  
  1. 四川大学水力学与山区河流开发保护国家重点实验室,四川,成都,610065
  2. 四川大学水利水电学院,四川,成都,610065
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.03.028
  CLC： TV321
- Online First：13 June 2018，
  
  Published：2015
- 稿件说明：
移动端阅览
YANG Bao-quan, CHEN Yuan, ZHANG Lin, et al. Research on dam abutment reinforcement effect of Jinping arch dam based on geomechanical model test[J]. 2015, 36(3): 819-826.
DOI：

YANG Bao-quan, CHEN Yuan, ZHANG Lin, et al. Research on dam abutment reinforcement effect of Jinping arch dam based on geomechanical model test[J]. 2015, 36(3): 819-826. DOI： 10.16285/j.rsm.2015.03.028.

摘要

锦屏一级高拱坝最大坝高305 m，是目前在建的世界最高拱坝，其坝址区地质条件复杂，存在断层、蚀变岩脉、层间挤压带、节理裂隙及深部裂缝等各类软弱结构面，坝与地基的整体稳定问题突出。为使坝体达到良好的受力状态，满足拱座的抗滑稳定与变形稳定等要求，工程上采取了大量的加固措施，主要有左坝肩垫座、左右坝肩混凝土网格洞塞置换、刻槽置换、传力洞等。加固处理后，坝肩的整体稳定性以及坝肩坝基的加固效果如何是工程上关心的重要问题。采用两个三维地质力学模型，分别开展了锦屏一级高拱坝在地基未加固和加固两个方案下的坝肩稳定综合法破坏试验研究，对比分析了两个方案下坝与地基的变形分布特性、坝肩坝基失稳的破坏机制和整体稳定安全度。结果表明：坝肩坝基加固处理后，坝体及左、右两岸坝肩变位的对称性得到明显改善，变位量值减小；在相同的超载倍数下，加固方案下两坝肩开裂破坏的范围减小，破坏程度减轻，坝肩破坏失稳的超载系数增大，超载能力得到提高；未加固方案拱坝整体稳定综合法试验安全系数为4.7 ~ 5.0，加固方案下安全系数为5.2 ~ 6.0，安全度得到明显提高。综合分析认为，锦屏拱坝采用以坝肩垫座、混凝土网格置换洞塞、刻槽置换、传力洞等为主的加固方案对坝肩坝基起到了良好的加固效果。

Abstract

The JinpingⅠhigh arch dam with a height of 305 m is the highest under-construction dam of the world at present. The overall stability of the dam and foundation is a prominent problem due to the complex geological conditions in the dam site area. There are a variety of weak structural planes including faults

alteration veins

inner layer compressed zones

joint fissures and deep cracks. To make the dam be in much better stress state and meet anti-sliding stability and deformation stability of the skewback

a lot of reinforcement measures are adopted in the project. The main reinforcement measures include the left abutment concrete seating replacement

concrete grid and hole plug replacement

grooving replacement

and shearing resistant hole

etc. The overall stability of the dam abutment and the effects of dam abutment reinforcement are the important issues which must be concerned in practical engineering. The method of 3D geomechanical model test is adopted to carry out damage experiments. Two 3D models of JinpingⅠhigh arch dam are established respectively. One model is for the unreinforced scheme

and the other one for the reinforced scheme. Deformation distribution characteristics of the dam and foundation

failure mechanism and the overall stability safety degree derived from the two models are comparatively analyzed. The results show that

after reinforced

the symmetry of displacement of the dam body and dam abutments are significantly improved and the displacements are greatly reduced; the crack range and the damage extent of dam abutments are reduced under the same overload ratio

the overload coefficients to failure of the dam abutments are increased and the overload capacity is raised. The safety factors of overall stability obtained with comprehensive method are 4.7-5.0 for unreinforced scheme

and 5.2-6.0 for reinforced scheme. The safety degree is obviously improved through reinforcement measures. Comprehensive analysis shows that the main reinforcement measures

including the left abutment concrete seating replacement

concrete grid and hole plug replacement

grooving replacement

shearing resistant hole

applied to JinpingⅠhigh arch dam

are quite effective.

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