STUDY OF PREDICTION MODEL FOR TRIANGULAR WAVE LOADING SECTION DEFORMATION RATE OF YICHANG SANDSTONE
LIU Jie1，LI Jianlin1，2，DENG Huafeng1，ZHANG Chaofeng3，LI Yingxia1
(1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；2. School of Civil and Hydropower Engineering，China Three Gorges University，Yichang，Hubei 443002，China；3. Ertan Hydropower Development Co.，Ltd.，Chengdu，Sichuan 610051，China)
Abstract：By taking Yichang sandstone as the research object and RMT–150C rock and soil mechanics test system as the test platform，a prediction model of deformation rate in triangular wave loading section is studied. Loading process is divided into lag time segment and non-lag time segment；and then classification standard is established. Given in the lag time，it may occur the phenomenon of or ，so the concept of apparent modulus is proposed. By analyzing the axial loading test results of the same rock samples without damaging under different waveforms and different frequencies，the linear relationship between apparent elastic modulus and instant vertical force by experiment is found；and then the physical meanings of related parameters are given. On this basis，first，a predicting model of deformation rate in triangular wave loading section with non-lag time segment is established；then some examples are given by combinating load patterns and related parameters. At the same time，a prediction model of lag time segment is given according to experimental data. The prediction model is reasonable by comparative studies，because prediction deformation rate and stress-strain curve anastomose exactly with measured values.
