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利用动态版岩石破裂过程分析系统(RFPA~(2D))模拟岩体加载和卸载过程岩体内部裂纹起裂、扩展的演化规律,研究加载和卸载条件岩体内部裂纹开裂异同;通过不同压力条件下圆形隧洞围岩开裂分布特征模拟及分析,探索高地应力条件下地下洞室开挖卸荷引起的应力效应及其对围岩开裂的影响,并依据声发射(AE)作为瞬态卸荷引起岩体开裂的判据研究动态卸荷引起的围岩开裂范围。研究表明:开挖卸荷是深埋隧洞围岩发生开裂的重要原因;卸荷持续时间越短引起的围岩开裂范围越大;围岩开裂深度及范围随着侧压力系数增加而增大,且侧压力系数不等于1时,高地应力条件圆形隧洞围岩开裂区域近似呈V型。
Using the dynamic rock burst process analysis system (RFPA 2D) to simulate the evolution of crack initiation and propagation during rock mass loading and unloading, the similarities and differences of cracks in rock mass under loading and unloading conditions were studied. Through the different pressure conditions Under the condition of high ground stress, the stress effect caused by excavation unloading in underground caverns and its influence on the cracking of surrounding rock are explored. According to AE (Acoustic Emission) as transient unloading The criterion of cracking caused by rock mass is used to study the range of rock cracking caused by dynamic unloading. The results show that excavation unloading is an important reason for the cracking of surrounding rock in deep tunnel. The shorter the cracking duration of surrounding rock caused by the shorter unloading duration, the more the cracking depth and range of surrounding rock increase with the increase of lateral pressure coefficient, And the lateral pressure coefficient is not equal to 1, the cracking area of surrounding rock of circular tunnel under high ground stress is approximately V-shaped.