摘要
为了研究顺向节理高陡岩质边坡破坏机理,指导邻近高铁的顺向节理高陡岩质边坡工程项目安全生产,采用离散元数值模拟计算的方法,对均质无节理、切层节理、隐伏节理高陡岩质边坡进行稳定性计算,研究了坡面倾角、切层节理倾角和隐伏节理间距对边坡稳定性的影响规律,研究表明,当切层节理倾角小于10°时,破坏形式为圆弧滑动破坏;当切层节理倾角大于20°时,破坏形式为阶梯型滑动破坏;当切层节理倾角大于30°时,破坏形式为单层面滑动破坏;隐伏节理边坡易发生溃曲破坏,且随着节理间距的增加,边坡安全系数先逐渐增大,而后趋于稳定。研究结果表明,针对含切层节理和隐伏节理边坡,其破坏模式是双平面破坏,边坡的破坏经过了一个自下而上沿切层节理塑性破坏和一个自上而下沿隐伏节理拉伸破坏的过程,属于滑移-拉裂破坏。
In order to study the failure mechanism of high and steep rock slope with consequent joints and guide the safe production of high and steep rock slope engineering projects with consequent joints,the discrete element numerical simulation method was adopted in the paper to calculate and analyze the homogeneous high and steep rock slope without joints,cut joints,and hidden joints,and to study the influence of slope angle,cut joint angle and hidden joint spacing on slope stability.It was obtained that when the dip angle of the cut joint was less than 10°,the failure mode was circular sliding failure;When the dip angle of the cut joint was greater than 20°,the failure mode was stepped sliding failure;When the dip angle of the cut joint was greater than 30°,the failure mode was single-layer sliding failure;The hidden joint slope was prone to collapse,and with the increase of joint spacing,the safety factor of the slope first increased gradually,and then tended to be stable.The conclusions of the research on the slope with shear layer joints and hidden joints are as follows:the failure mode of this kind of slope is biplane failure,and the failure of the slope has undergone a process of plastic failure along the shear layer joints from bottom to top,and a tensile failure along the hidden joints from top to bottom,belonging to slippage and tensile failure.
作者
麻景瑞
董元滨
MA Jingrui;DONG Yuanbin(Shandong Rail Transit Survey and Design Institute Co.,Ltd.,Ji'nan 250101,China)
出处
《铁道勘察》
2023年第4期114-121,共8页
Railway Investigation and Surveying
关键词
高速铁路
顺向节理
岩质边坡
数值模拟
破坏机理
high-speed railway
bedding joint
rock slope
numerical simulation
failure mechanism
