北京站至北京西站地下直径线工程地处北京市中心城区，沿线建/构筑物众多。沿线穿越立交桥、护城河、地铁2号线等重大风险源。通过对地下直径线全线进行详细的风险评估，充分分析沿线各风险源的状况，并根据评估结果提出防止和降低风险的有效控制措施，施工完成后地铁2号线测点沉降值均小于2 mm，天宁寺桥因隧道开挖引起的沉降值低于3 mm，施工对周围建/构筑物影响非常小。

Through the detailed risk evaluation on underground diameter project from Beijing railway station to Beijing railway west station, the conditions of all the risk sources along were analyzed adequately. At last, effective control measures of risk prevention and reduction were proposed based on the evaluations results. The settlement of all the measuring points of metro line 2 was lower than 2 mm. Due to the tunnel excavation the settlement of Tianningsi Bridge was lower than 3 mm. The construction impact on surrounding building was very small.