Energy Evolution and Failure Tendency Index of Beishan Granite
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摘要: 为深入研究北山高放废物地质处置预选区内花岗岩在不同加卸载路径条件下的能量演化规律，针对北山花岗岩圆形柱试样开展了不同初始围压和不同加卸载条件下的室内三轴试验，对试验数据进行处理对比分析，并建立了一种新型的岩石破坏能量倾向性指标。研究结果表明：岩石临界破坏时的总应变能、弹性应变能和耗散应变能均随着初始围压的增大而增大；岩石损伤破坏过程中的声发射特征参数与耗散能间具有较强的相关性；卸荷条件下岩石破坏模式分为内部损伤破坏和轴向应变破坏；在不同卸荷试验条件下岩石破坏能量倾向性指标均先增加后减小，在相同试验条件下，弹性应变能转化为耗散能效率越高，能量倾向性指标则越小，岩石破坏程度则越高。Abstract: To investigate the energy evolution of granite obtained from the Beishan pre-selected area for geological disposal of high-level radioactive waste under different loading and unloading paths, an indoor triaxial test on Beishan granite round column specimens under different initial surrounding pressure and different loading and unloading conditions was conducted. Indoor triaxial tests were carried out on the granite specimens with different initial envelope pressure and different loading and unloading conditions, the test data were processed and compared, and a new type of rock damage energy propensity index was established. The results show that the total strain energy, elastic strain energy and dissipative strain energy of the critical damage of the rock increase with the increase of the initial surrounding pressure; there is a strong correlation between the characteristic parameters of acoustic emission and dissipative energy during the damage of the rock; the rock failure mode under the unloading condition is divided into internal damage failure and axial strain damage failure; the energy propensity index of rock damage increases first and then decreases under different unloading test conditions, and the higher the efficiency of converting elastic strain energy into dissipative energy, the smaller the energy propensity index and the higher the degree of rock damage.
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表 1 试样基本参数
试样
编号直径/mm 高度/mm 高径比 质量/g 密度/(g·cm−3) TC1-1 51.42 101.16 1.97 554.58 2.64 TC1-2 51.58 101.18 1.96 553.03 2.62 TC2-1 50.90 101.70 2.00 545.27 2.63 TC2-2 51.38 101.08 1.97 548.04 2.61 TC3-1 51.58 101.28 1.96 554.58 2.62 TC3-2 51.58 101.78 1.97 554.41 2.61 UA1-1 51.20 101.30 1.98 558.10 2.68 UA1-2 50.80 100.70 1.98 542.88 2.66 UA2-1 50.70 101.60 2.00 552.38 2.69 UA2-2 51.58 101.18 1.96 553.03 2.62 UA3-1 50.90 101.70 1.99 545.27 2.63 UA3-2 51.38 101.08 1.97 548.04 2.62 UB1-1 51.58 101.28 1.96 554.58 2.62 UB1-2 51.58 101.78 1.97 554.41 2.61 UB2-1 51.06 100.40 1.97 541.79 2.64 UB2-2 51.08 101.48 1.99 547.02 2.63 UB3-1 51.18 101.18 1.98 552.17 2.65 UB3-2 51.60 101.40 1.97 549.56 2.59 
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表 2 三轴加卸载试验结果
加卸载
路径初始围压/
MPa破坏应力/
MPa泊松比 弹性段弹性
模量/GPa常规压缩 15 395.11 0.271 72.9 25 452.57 0.286 74.9 35 551.40 0.289 78.6 卸载路径1 15 310.97 0.337 72.9 25 359.96 0.370 80.0 35 431.36 0.337 82.9 卸载路径2 15 251.71 0.337 72.9 25 349.65 0.337 80.0 35 418.40 0.337 82.5
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