城市轨道交通复杂环境下明挖区间控制爆破技术——以徐州轨道交通1号线一期振兴路站-徐州东站明挖区间为例

发布时间：2018-10-26 21:48

【摘要】：为了在自身地质条件复杂,且外部存在交叉作业、无法实施封闭爆破施工的条件下,控制露天爆破振动及飞石对周边构建筑物的影响,以徐州轨道交通1号线一期地下市政工程振兴路站-徐州东站明挖区间爆破控制为例,采取减震带措施降低振速35%;主爆区通过严格控制同响最大装药量,合理布设炮孔和设计装药参数,使炮眼利用率超过90%;边坡采用预裂爆破技术成型较好,残眼率85%,超挖不超过15 cm;采取堵塞覆盖措施,有效控制了爆破飞石;通过联合警戒防护,避免了交叉施工、人群车辆繁多的风险;历时6个月开挖完成20万m3,取得了良好的进度、安全和成本效益。结果证明所采用的技术方法合理、安全,能够确保邻近高层建筑物的安全。
[Abstract]:In order to control the vibration of open-air blasting and the influence of flying stone on the surrounding structures, under the condition of complicated geological conditions and cross operation outside, it is impossible to carry out closed blasting construction. Taking the blasting control of the open excavation section of Xingxing Road Station and Xuzhou East Station of Xuzhou Rail Transit Line 1 as an example, the measures of reducing vibration speed by 35 times are adopted. By strictly controlling the maximum charge quantity of the same ring, setting the hole reasonably and designing the charge parameters, the main blasting area can make the utilization ratio of the hole exceed 90. The slope is shaped better by pre-splitting blasting technology, the residual hole rate is 85%, and the overcut is not more than 15 cm;. The measures of blocking and covering have been taken to effectively control the blasting flying stone, and the risk of crossing construction and numerous vehicles has been avoided through joint warning and protection, and 200000 m3 has been excavated for 6 months, and good progress, safety and cost benefit have been obtained. The results show that the proposed method is reasonable and safe, and can ensure the safety of adjacent high-rise buildings.
【作者单位】：徐州市城市轨道交通有限责任公司;
【分类号】：U455.6;U231.3

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