HydroChina Itasca Research and Development Center

Hangzhou, China

HydroChina Itasca Research and Development Center

Hangzhou, China

Time filter

Source Type

Liu N.,Hydrochina Huadong Engineering Corporation | Zhang C.,CAS Wuhan Institute of Rock and Soil Mechanics | Chu W.,HydroChina Itasca Research and Development Center | Zhu H.,HydroChina Itasca Research and Development Center | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

According to the characteristics of chlorite schist in Jinping II hydropower station, in the same section, multiple monitoring means including the deformation, stress and borehole TV were adopted to analyze the internal mechanical state of surrounding rock. In order to understand the engineering mechanical properties of chlorite schist and its impact on the deformation failure mechanism, uniaxial and triaxial compression tests, grouting penetration test and triaxial rheological test were carried out. And the test results revealed many factors of deformation, instability and destruction of chlorite schist, and provided reference for determination of supporting measures. The stability of chlorite schist depends mainly on whether the lining structure can resist the squeezing effects caused by rheology and water softening. By introducing softening coefficient and Burgers rheological model, the surrounding rock stability from the viewpoint of the force of the lining structure was evaluated. The results of numerical calculation show that the lining structure is in high safety redundancy.


Fang D.,Hydrochina Huadong Engineering Corporation | Liu N.,Hydrochina Huadong Engineering Corporation | Zhang C.,CAS Wuhan Institute of Rock and Soil Mechanics | Chu W.,HydroChina Itasca Research and Development Center | Chen X.,Hydrochina Huadong Engineering Corporation
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

Water diversion tunnels #1 and #3of Jinping II hydropower station are bored by tunnel boring machine(TBM). The rockburst risk is high in the middle alignment. For the purpose of establishing reasonable boring scheme and rockburst control measurement, based on previous researches, different numerical methods are used to evaluate different pilot boring schemes' effects on reducing the rockburst risk, combining with actual situation. All these three pilot boring schemes can obviously reduce the rockburst risk. The selection of pilot boring schemes depends on the equipment and economic benefit factors. So, rockburst risk control measurements for large diameter TBM boring in high stress region are proposed. During TBM boring, the measurements of pilot, stress relieving blasting, assisting timely, systemic and high quality support are applied to reduce rockburst risk and ensure construction and structure safety.


Meng G.,HydroChina Itasca Research and Development Center | Meng G.,Hydrochina Huadong Engineering Corporation | Fang D.,Hydrochina Huadong Engineering Corporation | Li L.,Hydrochina Huadong Engineering Corporation | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

Preferred discontinuity derived from diagenesis and tectonics reworking always results in the anisotropic characteristics of engineering rock mass. Large-scale engineering rock masses with intermittent joints set have anisotropic strength characteristic, which is influenced by the rock bridge either. So the test results of intermittent joints can not be directly used for ubiquitous joint model, while the equivalent continuum persistent joint parameters should be adopted. When the macroscopic anisotropy simulated by FLAC3D ubiquitous joint model coincides by 3DEC model, the equivalent continuum persistent joint parameters can be defined by inversion analysis. Then, indirectly equivalent continuum method has equal function with discontinuum method in describing anisotropic mechanical behavior of rock mass. In summary, numerical experiment has become a more effective way than analytical method to estimate the macroscopic parameters with random intermittent jointed rock mass. Result shows that the equivalent strength of the equivalent continuum persistent joint parameters by the combined effects of intermittent joints and the rock bridge is higher than that of the real intermittent joints. In addition, in order to keep the definition of the set of directions where the strength of the equivalent discontinuities is equal to the strength of the intermittent discontinuities containing rock bridges, the most likely apparent dip direction of the ubiquitous joint model should have (φj-φj)/2 separation angle with the real dip direction of the intermittent joints.


Zhang C.,Hydrochina Huadong Engineering Corporation | Liu N.,Hydrochina Huadong Engineering Corporation | Zhu H.,HydroChina Itasca Research and Development Center | Chu W.,HydroChina Itasca Research and Development Center | Wu J.,HydroChina Itasca Research and Development Center
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

The marble of Jinping II hydropower station diversion tunnel shows a phenomenon of crack propagation with time under high geostress, which impacts significantly the run-time safety of diversion tunnel. The lag fracture after excavation, monitoring results by bolt stress meter and sound wave test all reflect the characteristic of crack propagation with time. The laboratory test and numerical analysis are adopted to prove that the fracture is the main response way of marble after excavation, which indicates that a bolt stress meter and sound wave test have better applicability, and multipoint displacement meter sensitivity is worse. The behavior of GSI decreasing exponentially with time is used to stand for marble strength decreasing with time, and further behalf on tunnel excavation damage zone increasing with time. Based on the theory, the stress corrosion(SC) model is set up. The obtained field monitoring and testing data are used to check the related parameters of SC model. The long-term mechanical response of marble, anchor stress state and lining structure security are analyzed in detail;and these characteristics consist well with the actual excavation response.

Loading HydroChina Itasca Research and Development Center collaborators
Loading HydroChina Itasca Research and Development Center collaborators