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| Static compression behavior and stress-strain relationship of rigid-flexible combinations under cyclic loading-unloading |
| YANG Rongzhou1，2，XU Ying1，2，LIU Jiaxing2，DING Jinfu2，CHENG Lin2 |
(1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. School of Civil Engineering and Architecture，
Anhui University of Science and Technology，Huainan，Anhui 232001，China)
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Abstract To explore the static compression behavior and damage evolution characteristics of the“rigid-flexible combination”surrounding rock support structure，a new type of green and sustainable“rigid-flexible combination”support strucature was initially established with a high content of rubber-cement composite material as the energy-absorbing cushioning material in the energy-absorbing lining structure. Monotonic compression and cyclic compression tests were carried out on the combination specimens of“rigid-rigid：rock(sandstone) like material (RLM)-normal cement mortar(NCM)”，“rigid-flexible：RLM-rubber cement mortar(RCM)”and“flexible-rigid：RCM-high performance supporting concrete(HPSC)”. The static compression behavior and damage characteristics of the specimens were compared and analyzed from the aspects of the stress-strain curve，deformation，modulus，energy，damage evolution，and failure state. The influence of the rigid-flexible ratio on the compressive mechanics and damage characteristics of combination specimens was further discussed. The results show that，under the same test conditions and loading modes，compared with RLM-NCM，the peak stress of RLM-RCM and RCM-HPSC decreased by 86.2% and 82.8% respectively，and the maximum loading deformation modulus of RLM-RCM and RCM-HPSC decreased by 78.7% and 72.9%，and the maximum cumulative elastic strain energy of RLM-RCM and RCM-HPSC decreased by 81.4% and 78.6%，respectively. The failure degrees of RLM-RCM and RCM-HPSC were obviously smaller than that of RLM-NCM，RLM-RCM and RCM-HPSC mainly occurred the ductile compression-expansion failure of RCM，while RLM-NCM mainly occurred the overall brittle compression-shear failure. RCM improved the elastic deformation and ductile-plastic deformation capabilities of the combination structure，provided the RLM compression flexible deformation space，and helps to avoid a large amount of energy accumulation of the combination structure caused by the RLM extrusion，thus reducing the risk and intensity of dynamic instability of the combination structure. Based on the Lemaitre equivalent strain principle，the pre-peak-post-peak two-stage damage constitutive model established by Weibull statistical distribution theory and Lognormal statistical distribution theory can accurately predict the stress-strain relationship of rigid-rigid combination specimens and rigid-flexible combination specimens under cyclic loading.
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2023, Vol. 42 
