CAJ | 학술논문

开挖爆破产生的地震波会诱发邻近隧道的动力响应，威胁邻近地下结构的稳定性。针对爆破应力波引起邻近隧道的质点振动和动应力集中效应，采用数值模拟方法，分析了爆破地震波中的 P 波对邻近圆形隧道的动力扰动特征。计算结果表明，应力波通过圆洞时，围岩中的主应力方向和动应力集中系数分布形态均与等效静态加载时相似，附加的动应力仅对圆洞洞壁附近围岩的主应力量值产生影响，而对洞壁以外围岩的主应力量值和主应力方向都将产生影响。其次，应力波通过圆洞时还将诱发振动速度集中现象，围岩质点的振动方向与波的传播方向总体一致，其振速集中系数与动应力集中系数的分布特征不同，且其最大值点位置相差约90°，这表明质点振动速度最大的位置并非动应力集中系数最大的位置。另外，圆洞洞壁最大振速集中系数随正则化波数的增加而增大，而最大动应力集中系数随正则化波数的增加而先增大后减小。
개알폭파산생적지진파회유발린근수도적동력향응，위협린근지하결구적은정성。침대폭파응력파인기린근수도적질점진동화동응력집중효응，채용수치모의방법，분석료폭파지진파중적 P 파대린근원형수도적동력우동특정。계산결과표명，응력파통과원동시，위암중적주응력방향화동응력집중계수분포형태균여등효정태가재시상사，부가적동응력부대원동동벽부근위암적주응역량치산생영향，이대동벽이외위암적주응역량치화주응력방향도장산생영향。기차，응력파통과원동시환장유발진동속도집중현상，위암질점적진동방향여파적전파방향총체일치，기진속집중계수여동응력집중계수적분포특정불동，차기최대치점위치상차약90°，저표명질점진동속도최대적위치병비동응력집중계수최대적위치。령외，원동동벽최대진속집중계수수정칙화파수적증가이증대，이최대동응력집중계수수정칙화파수적증가이선증대후감소。
The seismic waves induced by blasting will cause the dynamic response of neighboring tunnel,and is harmful to the stability of tunnel.A numerical simulation was carried out to analyze the dynamic disturbing on the neighboring tunnels produced by blasting seismic waves.The numerical simulation results show that when a stress wave passes through the round tunnel,the direction of principal stress and the distribution patterns of dynamic stress concentration factor of the surrounding rock mass are similar to those in the state under equivalent static loads.On the round tunnel wall,only the principal stress magnitude of rock mass is disturbed by the additional dynamic stress. However,outside the round tunnel wall,both the principal stress magnitude and direction are influenced.The vibration velocity concentration phenomenon in the tunnel will also be induced by the stress wave,and the direction of rock particle vibration is the same as the direction of wave propagation.The velocity concentration factor distribution patterns are different from those of the dynamic stress concentration factors,and the maximum point position difference between them is about 90 °.This phenomenon indicates that the position of maximum velocity concentration factor dose not coincide with that of maximum dynamic stress concentration factor in the round tunnel.With the increase of regularized wave number, the maximum velocity concentration factor on the tunnel wall increases,while the maximum dynamic stress concentration factor on the tunnel wall first increases and then decreases.