城市综合管廊减震层不同设置方式的减震效果

Shock Absorption Effect of Shock Absorbing Layer Settings of Urban Utility Tunnel

为了提升强震区软弱地层城市综合管廊的抗震性能,以某城市综合管廊工程为研究对象,利用有限差分软件FLAC3D,探讨了不同设置方式的减震层的减震效果.结果表明,相较于无措施工况,设置垫层减震层后,管廊最大沉降减少1.61%,最大、最小主应力分别减小29.75%和4.88%,最大剪切应力减小18.49%,最小安全系数增大15.13%;设置半环减震层后,管廊最大沉降减小1.55%,最大、最小主应力分别减小34.12%和18.06%,最大剪切应力减小31.86%,最小安全系数增大18.33%;设置全环减震层后,管廊最大沉降减小16.92%,最大、最小主应力分别减小61.04%和28.84%,最大剪切应力减小35.78%,最小安全系数增大32.46%.全环减震层的减震性能优于垫层减震层和半环减震层,推荐在软弱地层城市综合管廊采用全环减震层进行抗震设计.

To improve the seismic resistance behavior of the soft-stratum of urban utility tunnel in strong earthquake areas,this paper takes the utility tunnel as the research object and studies,the shock absorption effect of the shock absorbing layer with different settings through finite difference software FLAC 3D.The results show that compared with the condition without seismic measures,the maximum settlement of the condition with the bedding shock absorbing layer decreases by 1.61%,the maximum and minimum principal stresses decrease by 29.75%and 4.88%respectively,the maximum shear stress decreases by 18.49%and the minimum safety factor increases by 15.13%;the maximum settlement of the condition with setting a semi-ring shock absorbing layer decreases by 1.55%,the maximum and minimum principal stresses decrease by 34.12%and 18.06%respectively,the maximum shear stress decreases by 31.86%and the minimum safety factor increases by 18.33%;the maximum settlement of setting a full-ring shock absorbing layer decreases by 16.92%,the maximum and minimum principal stresses decrease by 61.04%and 28.84%respectively,the maximum shear stress decreases by 35.78%and the minimum safety factor increases by 32.46%.It can be concluded that the shock absorption effect of setting a full-ring shock absorbing layer is better than the cushion layer and the semi-ring layer.