首页|地震作用下半填路堤的伤损评价研究

地震作用下半填路堤的伤损评价研究

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针对当前半填路堤动力响应问题研究成本高、参数调整不灵活、影响因素单一等问题,基于数值模拟,以四川某路段发生震害的半填路堤为例,分析不同等级地震荷载(6级、7级、8级、9级)作用下半填路堤的设施损伤.采用人工拟合地震波,引入黏弹性边界,分析半填路堤在不同条件下的位移变形、边坡稳定性和路堤承载力.通过强度折减法与极限平衡法评估边坡稳定性,运用Terzaghi公式计算路堤承载力.结果表明,不同工况下,强度折减法对比极限平衡法得到的安全系数误差均在4％以内,说明强度折减法可以较好地评估边坡稳定性;随着地震等级的提高,半填路堤的位移增量逐渐增大,边坡稳定性逐渐降低,路堤承载力逐渐降低;半填路堤在8级、9级地震荷载作用下处于失稳状态;在8级地震荷载作用下,半填路堤位移增量增长约20倍,安全系数下降52.8％,路堤承载力下降57.0％,同比变化幅度均最明显,表明8级地震荷载对半填路堤的破坏性更显著.
Study on Damage Evaluation of Semi-Filled Embankment Under Earthquake
Aiming at the problems of high research cost,inflexible parameter adjustment and single influencing factor of dynamic response of semi-filled embankment,based on numerical simulation,this paper took the semi-filled embankment of a road section in Sichuan as an example to analyze the facility damage of semi-filled embankment under different levels of seismic load(6,7,8,9).The displacement deformation,slope stability and embankment bearing capacity of semi-filled embankment under different conditions were analyzed by artificial fitting seismic wave and introducing viscoelastic boundary.The slope stability was evaluated by strength reduction method and limit equilibrium method,and the bear-ing capacity of embankment was calculated by Terzaghi formula.The results show that under different working conditions,the error of the safety factor obtained by the strength reduction method compared with the limit equilibrium method could be controlled within 4％,indicating that the strength reduction method can better evaluate the slope stability;With the increase of seismic grade,the displacement increment of semi-filled embankment increases gradually,the slope stability decreases gradually,and the bearing capacity of embankment decreases gradually.The semi-filled embankment is in an unstable state under the action of 8 and 9 earthquake loads.Under the action of 8-level seismic load,the displace-ment increment of semi-filled embankment increases by about 20 times,the safety factor decreases by 52.8％,and the bearing capacity of embankment decreases by 57.0％.The year-on-year variation range is the most obvious,indicating that the 8-level seismic load is more destructive to the semi-filled em-bankment.

semi-filled embankmentearthquakedisplacement deformationslope stabilitybearing capacity of embankment

尹腾谦、司春棣、凡涛涛、张勇、李奇轩

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石家庄铁道大学土木工程学院,河北石家庄 050043

石家庄铁道大学交通运输学院,河北石家庄 050043

河北省交通安全与控制重点实验室,河北石家庄 050043

河北省高速公路京雄筹建处,河北保定 071799

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半填路堤 地震 位移变形 边坡稳定性 路堤承载力

国家重点研发计划国家重点研发计划河北省高层次人才项目河北省交通厅科技项目河北省交通厅科技项目河北省交通厅科技项目

2021YFB26006052021YFB2600600A202105004JX-202010JD-202006JD-202007

2024

10.13319/j.cnki.sjztddxxbzrb.20240057

石家庄铁道大学学报(自然科学版)
石家庄铁道大学

石家庄铁道大学学报(自然科学版)

CSTPCD
影响因子：0.757
ISSN：2095-0373
年,卷(期)：2024.37(2)
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