NDLI: A systematic engineering geological evaluation of diabase dikes exposed at the underground caverns of Dagangshan hydropower station, Southwest China

Content Provider	Springer Nature Link
Author	Shen, Yanjun Xu, Guangli Yi, Jiangnan
Copyright Year	2017
Abstract	Dagangshan hydropower station is located in the middle of Dadu River, Southwest China. Many diabase dikes were exposed in the adamellite granite body during excavation of the underground caverns. The dikes are highly directional, have crushed interiors, exhibit strong alteration, and have poor contact relationships with surrounding rocks, all of which is inconsistent with the characteristics of typical diabase. This paper describes systematic research that focused on the dikes’ spatial distribution, macroscopic characteristics, physical and mechanical properties, and common instability modes. Factors influencing their stability and their corresponding control measurements are discussed in the context of the site and its conditions. Results show that most of the dikes located in the underground caverns are the branches of the main dike β9, which produced from a strong basic magma extrusion–overflow event happened in between the Permian and Triassic. Due to multiple strong tectonic activities, the chlorite alignment of these dikes generally tended to be significant and leaded the physical and mechanical properties to be poor. Then, excavation and repetitive blasts resulted in strong disturbances to the original dikes and even caused rock unloading (collapse, rock block fall) and groundwater runoff system (water inflow) change. According to the common instability modes and reasons of diabase dikes, some specific control measures including solidified rubbles, reinforcement methods, pre-grouting, and small ducts are implemented in order to keep the surrounding of diabase safety, and the results show that the control methods perform a proper effect on these engineering problems.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	76
Issue Number	14
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-07-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diabase dike Geological evaluation Neotectonic activity Instability modes Control measurements Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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