Hydraulic fracturing analysis method of reinforced concrete lining in hydraulic tunnel

被引：0
|
作者：
Zhou L. [1 ,2 ]
Su K. [1 ]
Wang Y. [2 ]
Zhang Y. [1 ]
Zhu H. [1 ]
Wu H. [1 ,2 ]
机构：
[1] State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan
[2] Changjiang Institute of Survey, Planning, Design and Research, Wuhan
来源：
Shuili Xuebao/Journal of Hydraulic Engineering | 2021年 / 52卷 / 01期
关键词：
Cohesive element; Conditional cooperation; Hydraulic fracturing; Hydraulic tunnel; Reinforced concrete lining;
D O I：
10.13243/j.cnki.slxb.20200415
中图分类号：
学科分类号：
摘要：
The cohesive element with hydro-mechanical coupling property is introduced to simulate the lining crack and lining-rock interface. In this way, the discontinuous displacement characteristics of lining crack and interface gap can be taken into consideration, as well as the flow characteristics of pressure water inside. Combined with the indirect-coupled method of hydro-mechanical interaction, the hydraulic fracturing algorithm of reinforced concrete lining in hydraulic tunnel is proposed. The development history of lining crack and the evolution of crack width are explored, as well as the water pressure transfer characteristics inside lining crack and interface gap. Based on this, the influences of conditional cooperation between lining and surrounding rock are analyzed systematically. Through the calculation and analysis, it can be found that the process of crack initiation and propagation is short and inseparable during the water-filling period of hydraulic tunnel. Subsequently, the water pressure inside lining crack suddenly increases, and the effect of inner water exosmosis accelerates. After the cracking of lining, the water pressure inside lining crack slightly declines along the radial direction, and the pressure magnitude is relatively close to the inner water pressure. With the conditional cooperation considered, the water flow channel formed by the lining crack and lining-rock interface can play a role in transmitting water pressure, resulting in a more uniform distribution of water pressure outside the lining. The lining cracks are in a relatively stable state, and the distribution of lining cracks is small in number and large in spacing. This is more consistent with the results of field tests. © 2021, China Water Power Press. All right reserved.
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页码：21 / 33
页数：12
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