噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2015年
2期
116-120
,共5页
振动与波%地铁%有限元模型%振动放大区%隧道埋深%土层弹性模量
振動與波%地鐵%有限元模型%振動放大區%隧道埋深%土層彈性模量
진동여파%지철%유한원모형%진동방대구%수도매심%토층탄성모량
vibration and wave%subway%finite element model%vibration amplification%buried depth of tunnel%elas-tic modulus of soil stratum
以南昌地铁一号线穿越的土层为研究对象，建立轨道—隧道—大地的三维有限元模型，施加粘弹性人工边界，从隧道埋深，场地土层弹性模量等角度分析了由地铁运行所诱发的地面振动的传播规律。研究表明：地面振动的衰减并不是随着与隧道中心距离的增加呈严格意义单调递减，而是距离线路某一范围内存在一个振动放大区。隧道埋深越深，振动放大区出现在距离隧道越远的位置，而且振动放大区出现的次数会增加；土层越硬振动放大区越靠近隧道，振动放大区出现的次数会越多。振动放大区第一次出现在距离隧道约20 m～30 m处，振动反弹量比较大，被放大频率带主要分布在6 Hz～28 Hz，其中8 Hz～12 Hz最为集中，如果侵入建筑群，需特别关注。第二次第三次振动反弹量小，重视程度可以放宽。
以南昌地鐵一號線穿越的土層為研究對象，建立軌道—隧道—大地的三維有限元模型，施加粘彈性人工邊界，從隧道埋深，場地土層彈性模量等角度分析瞭由地鐵運行所誘髮的地麵振動的傳播規律。研究錶明：地麵振動的衰減併不是隨著與隧道中心距離的增加呈嚴格意義單調遞減，而是距離線路某一範圍內存在一箇振動放大區。隧道埋深越深，振動放大區齣現在距離隧道越遠的位置，而且振動放大區齣現的次數會增加；土層越硬振動放大區越靠近隧道，振動放大區齣現的次數會越多。振動放大區第一次齣現在距離隧道約20 m～30 m處，振動反彈量比較大，被放大頻率帶主要分佈在6 Hz～28 Hz，其中8 Hz～12 Hz最為集中，如果侵入建築群，需特彆關註。第二次第三次振動反彈量小，重視程度可以放寬。
이남창지철일호선천월적토층위연구대상，건립궤도—수도—대지적삼유유한원모형，시가점탄성인공변계，종수도매심，장지토층탄성모량등각도분석료유지철운행소유발적지면진동적전파규률。연구표명：지면진동적쇠감병불시수착여수도중심거리적증가정엄격의의단조체감，이시거리선로모일범위내존재일개진동방대구。수도매심월심，진동방대구출현재거리수도월원적위치，이차진동방대구출현적차수회증가；토층월경진동방대구월고근수도，진동방대구출현적차수회월다。진동방대구제일차출현재거리수도약20 m～30 m처，진동반탄량비교대，피방대빈솔대주요분포재6 Hz～28 Hz，기중8 Hz～12 Hz최위집중，여과침입건축군，수특별관주。제이차제삼차진동반탄량소，중시정도가이방관。
Taking the soil stratum of Nanchang No.1 subway as the research object, the rail-tunnel-soil coupled 3D fi-nite element model was established, and the artificial cohesive elastic boundary condition was applied. The propagation law of ground vibration induced by the subway operation was analyzed in the aspects of the depth of the tunnel and the elastic modulus of the soil stratum. The research shows that the ground vibration does not attenuate monotonically with the increas-ing of the distance from the subway, but there exist several vibration amplification regions somewhere else. With the increas-ing of the depth of the tunnel, the amplification regions go farther away from the tunnel and their number increases. With the increasing of the elastic modulus of the soil stratum, the amplification regions go closer to the tunnel and their number also increases. The nearest vibration amplification region, referred to as the first amplification region, is about 20 m-30 m away from the tunnel, and the vibration bounce is large there. Amplification frequency bands are distributed in the 6 Hz-28 Hz range, and mainly concentrated in 8 Hz-12 Hz. One should pay special attention to the first amplification region if it invades nearby building areas. However, the second and third amplification regions can be ignored since they have only small vibra-tion bounces.
