循环加–卸载下刚–柔组合体静态压缩行为及应力–应变关系

doi:10.13722/j.cnki.jrme.2022.1253

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摘要为探究“刚–柔组合”围岩支护结构静态压缩行为及损伤演化特征，以高掺量橡胶–水泥复合材料作为吸能衬砌结构中的吸能缓冲材料，初步建立一种绿色可持续的新型“刚–柔组合”支护结构，对“刚–刚：岩石(砂岩)相似材料(RLM)–普通水泥砂浆(NCM)”、“刚–柔：RLM–橡胶水泥砂浆(RCM)”和“柔–刚：RCM–高性能支护混凝土(HPSC)”组合体试件进行单调压缩和循环压缩试验，并从应力–应变曲线、变形、模量、能量、损伤演化以及破坏状态等方面进行对比分析，并进一步讨论刚柔比值对组合体试件压缩力学与损伤特征的影响。结果表明，同一试验条件和加载方式下，相比于RLM-NCM，RLM-RCM和RCM-HPSC的峰值应力分别下降86.2%和82.8%，加载变形模量最大值分别下降78.7%和72.9%，累积弹性应变能最大值分别下降81.4%和78.6%。RLM- RCM和RCM-HPSC的破坏程度明显小于RLM-NCM，RLM-RCM和RCM-HPSC主要发生RCM的延性压–胀破坏，而RLM-NCM主要发生整体性的脆性压–剪破坏。RCM提高组合结构的弹性变形和延–塑性变形能力，提供RLM压缩柔性变形空间，有助于避免组合结构因RLM挤压而造成大量的能量积聚，进而降低组合结构的动力失稳风险与烈度。基于Lemaitre等效应变原理，采用Weibull统计分布理论和Lognormal统计分布理论所建立的峰前–峰后双段式损伤本构模型能够对刚–刚组合体和刚–柔组合体在循环受荷作用下的应力–应变关系进行准确的预测。

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	杨荣周1
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关键词 ：岩石力学, 刚&ndash, 柔组合, 围岩支护, 循环压缩, 本构模型, 损伤特征, 刚柔比值

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.

Key words： rock mechanics rigid-flexible combination surrounding rock support cyclic compression constitutive model damage characteristics rigid-flexible ratio

引用本文:

杨荣周1，2，徐颖1，2，刘家兴2，丁进甫2，程琳2. 循环加–卸载下刚–柔组合体静态压缩行为及应力–应变关系[J]. 岩石力学与工程学报, 2023, 42(S2): 4216-4236.
YANG Rongzhou1，2，XU Ying1，2，LIU Jiaxing2，DING Jinfu2，CHENG Lin2. Static compression behavior and stress-strain relationship of rigid-flexible combinations under cyclic loading-unloading. , 2023, 42(S2): 4216-4236.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1253 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4216

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