岩土力学 ›› 2018, Vol. 39 ›› Issue (S2): 415-422.doi: 10.16285/j.rsm.2018.1211

• 数值分析 • 上一篇    下一篇

取水塔基坑开挖过程倒悬岩坎围堰渗透稳定性研究

王克忠1,金志豪1,杨麦珍2,刘先亮1,刘 华1   

  1. 1. 浙江工业大学 建筑工程学院,浙江 杭州 310023;2. 山西省中部引黄水务开发有限公司,山西 太原 030000
  • 收稿日期:2018-07-07 出版日期:2018-12-21 发布日期:2019-01-06
  • 作者简介:王克忠,男,1965年生,博士,教授,主要从事水电站地下工程、隧道工程理论研究。
  • 基金资助:
    国家自然科学基金项目(No.51679215)

Permeability stability study of overhang rock cofferdam during excavating foundation pit of water intake tower

WANG Ke-zhong1, JIN Zhi-hao1, YANG Mai-zhen2, LIU Xian-liang1, LIU hua1   

  1. 1. School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China; 2. Shanxi Yellow River Water Diversion Co. , Ltd., Taiyuan, Shanxi 030000, China
  • Received:2018-07-07 Online:2018-12-21 Published:2019-01-06
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51679215).

摘要: 岸塔式取水口一般建在靠近深水区的陡峻山坡上,受地形和空间限制基坑开挖过程中用于挡水围堰的岩坎厚度较小,其迎水面边坡被冲蚀淘空,呈倒悬状态,开挖过程中的水力耦合效应使薄壁岩坎稳定性更加不确定。基于裂隙岩体渗透理论和水流冲刷扩径模型研究,对基坑开挖过程预留薄壁岩坎的渗透稳定性进行仿真计算,并与原位监测数据进行对比分析。结果表明,注浆后的薄壁岩坎渗透性减弱,逐步施加内撑的基坑开挖方案可行,薄壁倒悬岩坎渗透变形在合理范围以内,开挖过程中薄壁岩坎自重偏心和迎水面外水压力导致了薄壁岩坎开挖初期向河道方向倾斜,开挖后期向岸坡方向倾斜。研究成果对复杂岸基上取水塔基坑开挖设计和施工具有重要的参考价值和理论意义。

关键词: 陡倾倒悬, 取水塔, 基坑开挖, 岩坎围堰, 渗透稳定性

Abstract: In general, the bank-tower-type water intake is built in the steep slope near the deep water zone, and the thickness of rock ridge used for the water retaining cofferdam is thin during excavation procedure of the foundation pit due to the construction. In addition, the upstream surface of the bank slope form a cavern subjected to water erosion, and the thin-walled rock ridge presents overhanging state; further the left bank slope is unstable induced by hydro-mechanical coupling and excavation action. Based on research about permeability theory and hydraulic aperture expanded model of fractured rock mass, the numerical method is adopted to simulate the excavation procedure of the foundation pit; further, compared the calculated deformation values with monitoring data. The results indicate that the permeability of thin-walled rock ridge become weakened after grouting, and the foundation pit excavation scheme that gradually install internal support is reasonable. The deformation of overhang rock ridge is in a reasonable range. Differently, the self-weight of rock ridge and water pressure of upstream face lead to inclined deformation of the thin-walled rock ridge towards river in initial excavation stage while towards the bank slope in later excavation stage. For the design and construction of foundation pit of water intake located on steep bank slope; the research results have important reference values and theoretical significance.

Key words: steep overhang, water intake tower, foundation excavation, rock cofferdam, permeability stability

中图分类号: 

  • TU452
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