It is imperative to understand the spatial and temporal coordination deformation mechanism and develop targeted deformation control technologies for high sidewall—bottom transfixion(HSBT)zones to guarantee the stabil...It is imperative to understand the spatial and temporal coordination deformation mechanism and develop targeted deformation control technologies for high sidewall—bottom transfixion(HSBT)zones to guarantee the stability of rock surrounding underground hydro-powerhouses under complex geological conditions.In this study,the spatial and temporal coordinated deformation control of HSBT zones was addressed from the aspects of the deformation mechanism,failure characteristics,and control requirements,and some coordinated deformation control technologies were proposed.On this basis,a case study was conducted on the deformation control of the HSBT zone of the underground powerhouse at the Wudongde hydropower station,China.The results showed that the relationship between excavation and support,and the mismatch of deformation and support of the surrounding rock mass in the HSBT zone of underground caverns with a large span and high in-situ stress can be appropriately handled.The solution requires proper excavation and construction procedures,fine blasting control,composite and timely support,and real-time monitoring and dynamic feedback.The technologies proposed in this study will ensure the safe,high-quality,and orderly construction of the Baihetan and Wudongde underground caverns,and can be applied to other similar projects.展开更多
In the study of solute transport in rough single fracture,the contact area is an important factor.The single fracture is defined as two categories in this article:the full transfixion single fracture and the partial t...In the study of solute transport in rough single fracture,the contact area is an important factor.The single fracture is defined as two categories in this article:the full transfixion single fracture and the partial transfixion single fracture.The purpose of this article is to research how the contact area affects the solute transport in partial transfixion single fracture.The contact area is generalized as square blocks with three sizes,and contact rate is variable,a series of experiments for solute transport were conducted in a simulation model which can simulate the two types of fractures in the laboratory.Based on the analysis of the breakthrough curves and the experiment phenomena,it is concluded that the difference of breakthrough curves of various contact rates is evident and increases with the increase of contact rate,the relative error curves reflect the difference of block sizes,and the maximum errors increase from smaller than 0.2 to about 0.8 with the increase of contact rate.These phenomena are also explained qualitatively in this article.It is concluded that the contact area strongly affects solute transport,and the research of channels formed by contact area is useful to further understand the rule of solute transport in partial transfixion single fracture.展开更多
基金This work is supported by the National Natural Science Foundation of China(Nos.51979146 and 12102230)the China Three Gorges Corporation Research Program(Nos.WDD/0490,WDD/0578,and BHT/0774)the China Postdoctoral Science Foundation(No.2022M711862).
文摘It is imperative to understand the spatial and temporal coordination deformation mechanism and develop targeted deformation control technologies for high sidewall—bottom transfixion(HSBT)zones to guarantee the stability of rock surrounding underground hydro-powerhouses under complex geological conditions.In this study,the spatial and temporal coordinated deformation control of HSBT zones was addressed from the aspects of the deformation mechanism,failure characteristics,and control requirements,and some coordinated deformation control technologies were proposed.On this basis,a case study was conducted on the deformation control of the HSBT zone of the underground powerhouse at the Wudongde hydropower station,China.The results showed that the relationship between excavation and support,and the mismatch of deformation and support of the surrounding rock mass in the HSBT zone of underground caverns with a large span and high in-situ stress can be appropriately handled.The solution requires proper excavation and construction procedures,fine blasting control,composite and timely support,and real-time monitoring and dynamic feedback.The technologies proposed in this study will ensure the safe,high-quality,and orderly construction of the Baihetan and Wudongde underground caverns,and can be applied to other similar projects.
基金supported by the National Natural Science Foundation of China (Grant Nos. 51079043,41172204)the Research Innovation Program for College Graduates of Jiangsu Province (Grant No. CXZZ11_0450)supported by the Program for Non-profit Industry Financial Program of MWR(Grant Nos. 200901064,201001020)
文摘In the study of solute transport in rough single fracture,the contact area is an important factor.The single fracture is defined as two categories in this article:the full transfixion single fracture and the partial transfixion single fracture.The purpose of this article is to research how the contact area affects the solute transport in partial transfixion single fracture.The contact area is generalized as square blocks with three sizes,and contact rate is variable,a series of experiments for solute transport were conducted in a simulation model which can simulate the two types of fractures in the laboratory.Based on the analysis of the breakthrough curves and the experiment phenomena,it is concluded that the difference of breakthrough curves of various contact rates is evident and increases with the increase of contact rate,the relative error curves reflect the difference of block sizes,and the maximum errors increase from smaller than 0.2 to about 0.8 with the increase of contact rate.These phenomena are also explained qualitatively in this article.It is concluded that the contact area strongly affects solute transport,and the research of channels formed by contact area is useful to further understand the rule of solute transport in partial transfixion single fracture.
