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Influence of demolition blasting of underwater towering thin wall on dynamic characteristics of adjacent steel pipe pile
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摘要: 沉管隧道暗埋段对接端、预制干坞坞口的临时护岸多采用深水钢管桩-混凝土止水墙复合结构，所处环境及结构的特殊性使其难以采取机械拆除的方法，研究混凝土止水墙爆破拆除对紧邻钢管桩动力特性的影响具有现实意义。基于襄阳市某工程沉管对接端止水墙爆破拆除工程，采用欧拉-拉格朗日耦合方法建立三维精细化钢管桩-混凝土止水墙有限元模型，分析不同炮孔布置形式（桩间与桩侧布孔）下拆除爆破对钢管桩动力特性的影响。研究表明，不同布孔形式下，锁口钢管桩均不会倾倒，但桩间布孔更有利于螺栓剪断，能够达到拆除对象破碎坍塌、保留对象“断而不倒”、对周围环境“零干扰”的爆破效果。Abstract: Deep-water steel pipe pile-concrete wall composite structure is often used as the temporary revetment of the buried section and dock entrance of immersed tunnel. The particularity of its environment and structure type brings in difficulties for mechanical demolition. The key to ensure the opening of the dock channel is to study the influence of the blasting demolition of concrete waterproof wall on the dynamic characteristics of adjacent steel pipe piles. Based on the blasting demolition engineering of the immersed tube butt end and dry dock gate waterproof wall in the Xiangyang East-West Axis Road Project, a coupled Eulerian-Lagrange method was used to establish the three-dimensional refined numerical model of the steel tube piles-concrete wall, and the dynamic characteristics of steel tube piles at varying blasthole positions (pile side charge holes and charge holes between piles) was analyzed. Results show that the locking steel pipe pile will not collapse under different hole layout forms, but the case with charge holes between piles is more beneficial to shearing bolts, which can achieve the blasting effects of “rupture and collapse of the demolition object”, “breaking without collapse of the retained object”, and “zero interference to the surrounding environment”.
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图 6 t=2 ms时刻桩间布孔时1、2号桩螺栓位移趋势云图
Figure 6. Contours of displacement trend of bolts for piles 1 and 2 in the case with charge holes between piles at t=2 ms
图 7 t=2 ms时刻桩侧布孔时1、2号桩螺栓位移趋势云图
Figure 7. Contours of displacement trend of bolts for piles 1 and 2 in the case with pile side charge holes at t=2 ms
图 8 1、2号桩等效塑性应变时程
Figure 8. Equivalent plastic strain time-histories for piles 1 and 2
表 1 数值模型参数
Table 1. Numerical model parameters
材料 密度/(kg·m−3) 弹性模量/MPa 泊松比 屈服强度/MPa 钢管 7 850 210 000 0.20 345 螺栓 7 850 210 000 0.20 345 水泥砂浆 2 000 360 0.26 10 钢管内填充沙 2 200 200 0.25 塑性混凝土 2 300 500 0.28 15 
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