基于最大周向应力准则的滑塌式危岩稳定性分析

我国山地地形分布广泛，山体危岩崩塌是山区的主要地质灾害之一.为了研究不同裂缝角度、水平地震力和垂直地震力等因素对危岩体安全系数的影响规律，运用最大周向应力准则对贵州高原与四川盆地交接地带的赤水河深切“V”型河谷的某危岩体进行稳定性分析，得出如下结论：危岩体安全系数随着裂缝角度的增大而减小，但在裂缝角度小于55°时，危岩体安全系数减小速度较快，裂缝角度大于55°时，安全系数减小速度较慢；危岩体安全系数随水平地震系数或垂直地震系数的增大而减小，且为线性减小趋势；水平地震力对危岩体的危害程度高于相等大小下的垂直地震力.

英文摘要:

China's mountainous terrain is widely distributed，and the collapse of mountainous dangerous rocks is one of the major geological disasters in mountainous areas.In order to study the influence of different crack angles，horizontal seismic forces and vertical seismic forces on the safety factor of dangerous rock mass，the maximum circumferential stress criterion is used to deeply cut the“V” type valley of the Chishui river in the intersection of Guizhou plateau and Sichuan basin.The stability analysis of the dangerous rock mass leads to the conclusion that the safety factor of the dangerous rock body decreases with the increase of the crack angle，but when the crack angle is less than 55°，the safety factor of the dangerous rock mass decreases rapidly，and the crack When the angle is greater than 55°，the safety factor decreases slowly；the safety factor of dangerous rock mass decreases with the increase of horizontal seismic coefficient or vertical seismic coefficient， and it decreases linearly； the damage of horizontal seismic force to dangerous rock mass.The degree is higher than the vertical seismic force of equal size.

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