CAJ | 학술논문

为测试悬浮隧道在洋流作用下的动力学行为,根据流场相似准则和弹性相似准则以及试验条件恰当地进行模型试验设计.考虑到实际流场洋流方向的不确定性,以圆形截面悬浮隧道进行试验,通过测试洋流作用下悬浮隧道管段的应变情况获得悬浮隧道的力学行为.试验模拟测试了在各种不同流速条件下,单节悬浮隧道管段在分别布置2组锚索支撑和布置3组锚索支撑时,悬浮隧道管体结构环向应变和轴向应变及张力腿锚索的轴力.试验表明:(1)管段外侧环向应变较内侧大,内外侧轴向应变相差不大;迎流面环向应变较背流面大,迎流面轴向应变较背流面小;外侧顶面环向应变与底面环向应变相差不大,外侧顶面轴向应变与底面轴向应变也相差不大;(2)增加支撑锚索数量能减小管段结构和锚索的受力;随着流速增加,管段上相同测点的轴向应变、环向应变都随流速的增大呈线性关系变化;(3)管段相同侧锚索轴力随时间的变化趋势基本一致,但受力变化并不均匀,迎流面侧锚索所受拉力随流速增大而线性增大,背流面位置处锚索所受拉力随流速增大呈线性减小后变为压力.
위측시현부수도재양류작용하적동역학행위,근거류장상사준칙화탄성상사준칙이급시험조건흡당지진행모형시험설계.고필도실제류장양류방향적불학정성,이원형절면현부수도진행시험,통과측시양류작용하현부수도관단적응변정황획득현부수도적역학행위.시험모의측시료재각충불동류속조건하,단절현부수도관단재분별포치2조묘색지탱화포치3조묘색지탱시,현부수도관체결구배향응변화축향응변급장력퇴묘색적축력.시험표명:(1)관단외측배향응변교내측대,내외측축향응변상차불대;영류면배향응변교배류면대,영류면축향응변교배류면소;외측정면배향응변여저면배향응변상차불대,외측정면축향응변여저면축향응변야상차불대;(2)증가지탱묘색수량능감소관단결구화묘색적수력;수착류속증가,관단상상동측점적축향응변、배향응변도수류속적증대정선성관계변화;(3)관단상동측묘색축력수시간적변화추세기본일치,단수력변화병불균균,영류면측묘색소수랍력수류속증대이선성증대,배류면위치처묘색소수랍력수류속증대정선성감소후변위압력.
In order to obtain the dynamic behavior of the submerged floating tunnel under the current effect, the model experiment was designed rightly according to the current similarity criterion, the elastic similarity criterion and the experiment conditions. Considered that the realistic current orientation is always random, the submerged floating tunnel with circular cross-section was used in the test. The dynamic behavior of submerged floating tunnel was acquired by testing the tube' s strains under the current effect. The model experiment was conducted to test the annular strain, the axial strain, and the axial force of the tension leg anchor of the submerged floating tunnel struc-ture under the conditions of different current velocities and one tube segment of submerged floating tunnel supported by two sets and/or three sets of anchor support. The result of experiment shows that (1) The outer annual strain of the tube is larger than that of the inner one, however, the outer axial strain of the tube is the same as that of the inner one. The up-stream annual strain is larger than that of the back one, but the axial strain has the opposite trend. There is little difference between the outer annual strain on the top and that at the bottom, and the outer axi-al strain has the same tendency. (2) With the number of support cable increasing, the force effected on the tube or the cable can be decreased. With the velocity of the current increasing, either the axial strain or the annular strain in the same position changes linearly. (3) There is the same tendency of the axial forces of the cables in the same side change with time, but the forces change unevenly. With the current velocity increasing, the tension of the ca-ble faced to the stream increases linearly, while the tension of the cable back to stream increases and then linearly decreases and it becomes pressure at last.