The Xiaowan Hydropower Station is located in a narrow valley with high slopes on both banks, which are composed of load released rocks and thick deposits distributed over them. Altogether six faults, i.e. F7 of grade-II and other five faults of F3, F11, F10, F5 and F20 of grade-III that go through the river bed.
Detailed rock magnetic results show that the magnetic minerals of the sediments were dominated by ferrimagnetic minerals such as magnetite, and a small contribution of hematite and maghematite also existed.
In addition, the characteristics of petrochemical parameters, trace element contents and rare earth element distributions of different rock types of the granitoids in different geotectonic units are also sufficiently discussed.
The Zhongpu Group is distributed in the Shihuigou area and composed of medium-basic volcanic rocks and volcanic clastic rocks interspersed with cherts, limestones, slates, and metamorphic sandstones.
The geochemistry of chert from the Zhongpu Group reveals that all cherts coexisting with island-arc volcanic rocks formed in a continental margin basin environment.
Test results as well as experimental techniques in the investigation of steel-lined pressure chambers and conduits buried in solid rock are briefly summarized and analyzed whereby the following conclusions are drawn: 1. The concrete-rock carries 55—85% of internal pressure. Stresses in ordinary steel-linings are comparatively low. 2. An important new subject is the in situ buckling test of steel linings under external water pressure. Further investigations are needed to simulate actual conditions. 3. It is ...
The severe deformation and cracking due to complex geological conditions in linings in the construction of this underground hydroelectric power plant has caused considerable concern. To monitor and investigate the stability of the surrounding rock and the behavior of reinforced concrete construction, field instrumentation has been set up and utilized, crack monitoring system was established. For the permanent stability of the underground caverns, further rock mechanics analysis and finite element analysis h...
This paper describes the testing results of determining the deformation characteristics of rock masses by radial jacking tests conducted in two hydroelectric projects,Yingxiuwan and Yilihe III. The influence of the loading length on the extent and depth of deformation was investigated. It indicates that the Measured rock deformation should be modified with formula(3) ,when the loading length is less than three times the diameter of the test tunnel.Meanwhile the validity of the principle of superposition is ...