scholarly journals Measures for controlling large deformations of underground caverns under high in-situ stress condition – A case study of Jinping I hydropower station

2016 ◽  
Vol 8 (5) ◽  
pp. 605-618 ◽  
Author(s):  
Shengwu Song ◽  
Xuemin Feng ◽  
Chenggang Liao ◽  
Dewen Cai ◽  
Zhongxu Liu ◽  
...  
Keyword(s):  
Stress Condition ◽  
Large Deformations ◽  
In Situ Stress ◽  
Hydropower Station ◽  
High In Situ Stress ◽  
Underground Caverns ◽  
Jinping I Hydropower Station

Coring damage extent of rock cores retrieved from high in-situ stress condition: A case study

2017 ◽  
Vol 21 (7) ◽  
pp. 2946-2957 ◽  
Author(s):  
Peng Yan ◽  
Qi He ◽  
Wenbo Lu ◽  
Yanli He ◽  
Wei Zhou ◽  
...  
Keyword(s):  
Stress Condition ◽  
In Situ Stress ◽  
High In Situ Stress ◽  
Rock Cores ◽  
Damage Extent

Study on Deformation and Damage of Rock Mass Subject to High In Situ Stress by Using a Elastoplastic Damage Model and Considering the Impact of Weak Planes

2013 ◽  
Vol 838-841 ◽  
pp. 705-709
Author(s):  
Yun Hao Yang ◽  
Ren Kun Wang
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Damage Model ◽  
Back Analysis ◽  
In Situ Stress ◽  
Surrounding Rock ◽  
High In Situ Stress ◽  
Underground Caverns ◽  
The Impact

Large scale underground caverns are under construction in high in-situ stress field at Houziyan hydropower station. To investigate deformation and damage of surrounding rock mass, a elastoplastic orthotropic damage model capable of describing induced orthotropic damage and post-peak behavior of hard rock is used, together with a effective approach accounting for the presence of weak planes. Then a displacement based back analysis was conducted by using the measured deformation data from extensometers. The computed displacements are in good agreement with the measured ones at most of measurement points, which confirm the validities of constitutive model and numerical simulation model. The result of simulation shows that damage of surrounding rock mass is mainly dominated by the high in-situ stress rather than the weak planes and heavy damage occur at the cavern shoulders and side walls.

scholarly journals High In Situ Stress Anisotropy Lead to Formation of Complex Fracture Patterns

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Xinjiang Yan ◽  
Zehao Zhang ◽  
Jifei Yu ◽  
Yanfeng Cao ◽  
Yanguang Yuan
Keyword(s):  
Stress Condition ◽  
Water Injection ◽  
In Situ Stress ◽  
Injection Rate ◽  
Geological Condition ◽  
Complex Fracture ◽  
Stress Anisotropy ◽  
Fracture Patterns ◽  
High In Situ Stress

During the process of water injection, due to solid particle deposition and foreign liquid intrusion, the formation near the wellbore was contaminated and blocked. As a result, water injection rate reduced and failed to meet the injection requirements. In order to improve water injection rate and improve oil recovery of offshore oilfields, hydraulic injection tests were carried out in controlled laboratory conditions. In general, the formation of complex fracture patterns is an ideal outcome of the hydraulic fracturing stimulation seeks to achieve. In situ stress condition is an inherited geological condition one can only adopt to. By comparing test results of different experiments that had varied stress and hydraulic injection conditions imposed, we can investigate their impact on the fracture patterns created. This paper presents laboratory evidences to support that if the hydraulic injection condition is managed properly, a complex fracture pattern is possible even under a high in situ stress anisotropy. Even if the in situ stress condition has a large anisotropy, proper hydraulic stimulation operations can still cause complex fracture patterns and thus provide good stimulation efficiency.

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