论文部分内容阅读
利用动力有限差分软件FLAC,结合强度折减动力分析法,提出抗滑桩抗震设计新方法,将滑坡安全稳定系数作为岩土体参数折减系数对岩土体参数进行折减,采用FLAC动力分析,考虑了桩与岩土体地震荷载下动力相互作用,将地震作用过程中桩内力峰值除以混凝土强度增大系数与地震作用完毕之后桩的内力值进行比较,二者中大值作为桩的抗震设计内力值,同时还要求桩顶边坡动力安全系数大于设计容许值,确保滑坡不会发生越顶破坏。通过一个滑坡算例,对抗滑桩支护抗震设计进行分析,结果表明:动力强度折减分析法进行抗滑桩抗震设计,能考虑桩土动力相互作用,并得到实际桩前推力分布形式,为抗滑桩支护边坡的抗震设计提供了一个新的思路。
By using dynamic finite difference software FLAC combined with strength reduction dynamic analysis method, a new method for seismic design of anti-slide piles is proposed. The stability of landslide is taken as the reduction coefficient of rock mass parameters, and the parameters of rock mass are reduced by FLAC dynamic analysis Considering the dynamic interaction between pile and rock under earthquake load, the peak value of internal force of pile during the earthquake action is divided by the coefficient of increase of strength of concrete and the value of internal force of pile after the earthquake is completed. The large value of the two is used as pile Seismic design of internal force value, but also requires that the dynamic safety factor of pile top slope is greater than the design allowable value, to ensure that the landslide will not occur overcapacity damage. Through a landslide case, the seismic design of the anti-sliding pile support is analyzed. The results show that the dynamic strength reduction analysis method can be used to design the anti-sliding pile anti-seismic design, which can consider the pile-soil dynamic interaction, Seismic design of anti-slide piles support slope provides a new idea.