南峰隧道安全风险评估及病害预防措施

Safety Risk Assessment and Disease Prevention Measures of Nanfeng Tunnel

以福州绕城高速公路A15合同段南峰隧道为例,采用创新性风险分析方法,依据隧道的地质状况、隧道长度、洞口形式及其特征等作为评估风险指标,计算了其风险等级值,再按照隧道安全风险评价指标分值表确定了南峰隧道的风险评价等级为Ⅱ级(定为中度风险)。分析了隧道开挖后可能出现大变形的病害特点,根据评估结论制订了因公路隧道可能产生坍方、突泥突水突石、基础沉降产生变形异常的预防措施。采用病害预防措施后,病害少且处理效果好,可为今后公路隧道施工的安全风险评估与预防措施提供参考。

Taking Nanfeng tunnel in A15 contract section of Fuzhou Ring Expressway as an example,the innovative risk analysis method is adopted to evaluate the risk indicators according to the geological conditions,tunnel length,portal form and characteristics of the tunnel,calculate the risk grade value,and then determine the risk evaluation grade of Nanfeng tunnel as gradeⅡ(medium risk)according to the score table of tunnel safety risk evaluation index.The disease characteristics of possible large deformation after tunnel excavation are analyzed.According to the evaluation conclusion,the preventive measures for abnormal deformation caused by collapse,mud,water and stone inrush and foundation settlement of highway tunnel are formulated.After adopting the disease prevention measures,the disease is less and the treatment effect is better,which can provide a better reference for the safety risk assessment and prevention measures of highway tunnel construction in the future.