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基于岩石能量交换原理和3种不同卸荷路径下试验,研究了卸荷条件下岩石轴向吸收应变能、环向扩容消耗应变能、弹性应变能以及耗散能的演化特征与演化速率。研究结果表明:3个方案中,岩石轴向吸收的应变能主要转化为环向扩容消耗应变能,扩容程度方案III>方案I>方案II,而转化为耗散能较少,只有在临近破坏时耗散能才明显增加。初始围压对轴向应变能、环向扩容消耗应变能及弹性应变能的影响程度明显大于卸载路径,且都随着初始围压的增大呈近似线性增加。同一初始围压下,岩样临近破坏时存储的弹性应变能大小方案II>方案I>方案III,岩石发生破坏时,方案II发生岩爆的可能性最大。卸载路径和初始围压对耗散能有显著的影响。3个方案中应变能的演化速率均随着初始围压的增大而增加,初始围压对应变能演化速率的影响与卸载路径有关。
Based on the rock energy exchange principle and three different unloading paths, the axial absorbed strain energy, the strain energy of circular expansion, the elastic strain energy and the evolution characteristics and evolution rate of dissipation energy under unloading condition were studied. The results show that in the three schemes, the strain energy absorbed by the rock in the axial direction can be mainly transformed into the energy consumption in the circumferential direction, and the expansion degree can be reduced to Scheme III> Scheme I> Scheme II. However, Dissipation when the energy consumption was significantly increased. The effect of initial confining pressure on axial strain energy, circular strain energy and strain energy of elastic expansion is obviously greater than that of unloading path, and both increase linearly with initial confining pressure. Under the same initial confining pressure, the elastic strain energy stored at the time of near failure of rock sample Scenario I> Scenario I> Scenario III: When rock is destroyed, rock burst is most likely to occur in solution II. The unloading path and initial confining pressure have a significant impact on dissipative energy. The evolution rate of strain energy increases with the increase of initial confining pressure in the three schemes. The influence of initial confining pressure on the evolution rate of strain energy is related to the unloading path.