黄土浅埋隧道粉沙层地质施工风险多指标识别

Multi-index Identification of Geological Construction Risk in Silt Layer of Shallow Buried Loess Tunnel

施工风险识别过程多维单因素指标评判,缺乏风险综合评判,导致对施工方案的优化和改进效果不明显,因此设计一种施工风险的多指标识别方法。分析施工风险识别的三维结构关系,得到分解的风险源子风险因素,通过两两比较判断矩阵和风险评价分值,经过一致性检验后计算出各个风险指标权重;综合风险概率与风险损失的评级标准,黄土浅埋隧道粉沙层地质施工风险的识别与评估。实际黄土浅埋隧道粉沙层的工程实例分析结果表明对于各个监测点共进行了18 d监测,其拱顶下沉、水平收敛以及地表沉降的变形量明显减少,改进的施工方案效果更好,说明该方法具有一定有效性。

Construction risk identification process multi-dimensional single factor index evaluation,lack of risk comprehensive evaluation,leading to the construction scheme optimization and improvement effect is not obvious,so a multi index identification method of construction risk is designed.By analyzing the three-dimensional structure relationship of construction risk identification,the decomposed risk source sub risk factors are obtained.Through pairwise comparison and judgment matrix and risk evaluation score,the weight of each risk index is calculated after consistency test;the comprehensive risk probability and risk loss rating standard are used to identify and evaluate the geological construction risk of shallow buried loess tunnel in silt layer.The analysis results show that the deformation of vault settlement,horizontal convergence and surface settlement is significantly reduced after 18 days of monitoring at each monitoring point.The improved construction scheme has better effect,which shows that the method is effective.