Dynamic responses of a concrete pipeline with bell-and-spigot joints buried in a silty clay layer to blasting seismic waves
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摘要: 为合理评价临近爆破施工振动作用对预埋在粉质黏土层承插式混凝土管道的影响，通过现场预埋多管节全尺寸管道的爆破试验，结合DH5956动态应变及TC-4850爆破振动等测试系统，研究了爆破振动作用下承插式混凝土管道动力响应特征，分析了管道管身及承插口动应变及振动速度空间分布规律；基于承插口允许转角规范及管身动态拉应变破坏准则，提出了承插式混凝土管道爆破振动速度安全判据。研究结果表明：爆破振动作用下管道管身及承插口之间存在不协调响应特征；爆破振动作用下管道承插口为管道最薄弱位置，爆破振动对承插式混凝土管道的影响应重点考虑承插口的失效；承插式混凝土管道爆破振动速度控制阈值为5 cm/s，结果可对类似地层中承插式埋地混凝土管道的保护起指导作用。Abstract: In order to evaluate the effect of blasting vibration on an adjacent concrete pipeline with bell-and-spigot joints buried in a silty clay layer, four blasting field experiments were conducted by applying the DH5956 dynamic strain testing system and TC-4850 blasting vibration device mounted on the buried pipelines, and the dynamic response characteristics of the concrete pipelines under blasting vibration were studied. The spatial distributions of the dynamic strain and vibration velocity of the pipe bodies and the bell-and-spigot joints were analyzed. Based on the maximum allowable deflection degree of the bell-and-spigot joints in the specification and the criterion of the dynamic tensile stress failure of the concrete, the safety criterion of the blasting vibration velocity for the bell-and-spigot concrete pipelines was proposed. The results show that there is an uncoordinated response between the pipe bodies and bell-and-spigot joints under the action of blasting vibration; the bell-and-spigot joints are the most venerable positions of the pipelines, and the failure of the the bell-and-spigot joints should be noticed when considering the effect of blasting vibration; the blasting vibration velocity control threshold of the the bell-and-spigot concrete pipelines is 5 cm/s, this research can provide a guidance for the pipeline protection in similar construction projects.
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图 3 爆源与管道相对位置及动应变监测点布置
Figure 3. Relative position between explosion source and pipeline, and arrangement of dynamic strain monitoring points
图 5 爆破试验现场管道内监测系统的布设
Figure 5. Layout of pipeline monitoring system in the experiments
图 6 4次试验中截面2-2环向应变曲线
Figure 6. Circumferential strain curves of section 2-2 in four experiments
1. Monitoring point 1; 2. Monitoring point 2; 3. Monitoring point 3; 4. Monitoring point 4
图 7 4次试验中截面2-2轴向应变曲线
Figure 7. Axial strain curves of section 2-2 in four experiments
1. Monitoring point 1; 2. Monitoring point 2
图 8 承插口监测点环向应变曲线
Figure 8. Hoop strain curves at monitoring points for bell-and-spigot joints
1. Experiment Ⅰ; 2. Experiment Ⅱ; 3. Experiment Ⅲ; 4. Experiment Ⅳ
图 9 试验Ⅰ中管道D2处振动速度时程曲线
Figure 9. Time history curves of vibration velocity measured by sensor D2 in experiment Ⅰ
图 10 管道承插口X方向的相对位移
Figure 10. Relative displacement of bell-and-spigot joints in X direction
图 12 管道偏转角度与X方向振动速度拟合曲线
Figure 12. Fitting curve between pipe deflection angle and vibration velocity in X direction
图 13 管道X方向振动速度峰值与动拉应变峰值拟合曲线
Figure 13. Fitting curve between peak vibration velocity and peak dynamic tensile strain in X direction
表 1 现场爆破试验参数
Table 1. Parameters for field blasting experiments
试验 炮孔深度H/m 炸药质量Q/kg 爆心距R/m Ⅰ 4 8 25 Ⅱ 4 8 20 Ⅲ 4 8 15 Ⅳ 4 8 10 
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表 2 4次爆破振动速度数据
Table 2. Vibration velocity data in four experiments
试验 爆破振动监测点 爆破振动速度/(cm·s−1) 试验 爆破振动监测点 爆破振动速度/(cm·s−1) X方向 Y方向 Z方向 X方向 Y方向 Z方向 Ⅰ D1 1.15 0.85 0.73 Ⅲ D1 3.56 2.62 1.35 D2 1.59 0.98 0.68 D2 5.85 2.36 1.89 D3 1.61 1.06 1.02 D3 5.82 3.60 2.42 D4 1.26 1.06 1.08 D4 4.23 2.83 1.94 D5 0.81 0.56 0.72 D5 3.23 2.56 2.84 D6 1.43 0.92 0.78 D6 5.02 2.57 1.72 Ⅱ D1 1.58 0.93 1.07 Ⅳ D1 9.12 6.44 2.28 D2 2.16 1.32 1.12 D2 14.25 8.56 4.02 D3 2.29 0.94 0.56 D3 14.46 7.53 3.19 D4 1.65 1.21 0.61 D4 9.81 5.66 2.21 D5 0.77 0.56 0.76 D5 9.02 3.12 2.56 D6 1.89 1.13 1.02 D6 12.56 7.95 3.64
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表 3 4次试验承插口2-3偏转角度
Table 3. Deflection angles of bell-and-spigot joint 2-3 in four experiments
试验 θL/rad θR/rad 总偏转角/rad 总偏转角/（°） Ⅰ 0.005 7 0.005 5 0.011 2 0.64 Ⅱ 0.006 6 0.006 3 0.012 9 0.74 Ⅲ 0.015 8 0.017 3 0.033 1 1.90 Ⅳ 0.097 1 0.034 6 0.131 7 7.55
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