地铁施工引发雨污管线灾变的试验研究与数值仿真

Study of Test and Numerical Simulation of Rain and Sewage Pipeline Based on Metro Construction

为了研究隧道盾构施工引发上覆雨污管线的沉降和内力,以北京市某地铁工程为基础,采用相似模型试验和有限元数值模拟的方法分别进行研究.通过对比相似模型试验和有限元计算结果,分析了隧道盾构施工对管线产生的影响.研究结果表明:管隧平行时,隧道盾构施工引起上覆雨污管线沉降呈现平缓分布,当管隧净距l与隧道直径D之比l/D为1. 5时,需在掌子面距盾构隧道尾部1. 5D范围内加密监测点的布设.管线应力分布呈平行趋势,当l/D为1. 5时,需在沿管线分布范围内对管节采取抗拉防护措施.

Based on typical metro shield tunneling engineering in Beijing,the model test and finite element numerical simulation were conducted in order to study settlement and inner force of rain and sewage pipeline induced by shield tunneling. The influence on pipeline induced by the tunnel excavation were analyzed through comparison between model test and finite element numerical simulation. The results demonstrated that the uniform distribution could be presented in the settlement curve of pipeline when the pipeline and tunnel was parallel. When the ratio of net distance of tunnel-pipe(l) and tunnel diameter(D)(l/D) was 1. 5,the supervision points would be laid out densely at the range of 1. 5 D between tunnel face and tunnel end. The protective measures of tension should be taken at the scope of pipeline.