突变视角下地下深埋隧洞塌方风险耦合演化研究

Study on coupling evolution of collapse risk of deep underground tunnel from perspective of catastrophe

为有效预防地下深埋隧洞施工塌方事故,首先基于轨迹交叉理论,将隧洞塌方风险因素分为人、物2类,分析并建立风险指标体系;然后运用改进的变权层次分析法(AHP)确定各指标综合权重,建立风险耦合突变模型,计算耦合度,并分析隧洞塌方风险在人、物风险因素作用下的演化途径,同时考虑随机扰动因子对隧洞塌方风险的影响,补充完善传统尖点模型;最后以白鹤滩水电站右岸尾水管检修闸门室为应用实例,验证风险耦合突变模型的有效性。结果表明:尾检室塌方风险的耦合度为0.8562,处于强度耦合区间,因素间存在较强耦合效应;此外,随机扰动因子取值范围为(-1.2878,-0.4272)时,会导致不断滋生的潜在风险隐患失控且爆发,增加塌方事故的发生概率。

In order to effectively prevent the collapse accidents in the construction of deep underground tunnels,firstly,based on the trajectory intersection theory,the risk factors of tunnel collapse were divided into two categories:people and objects,and the risk index system was analyzed and established.Then,the improved variable weight AHP was used to determine the comprehensive weight of each index,established the risk coupling mutation model,calculated the coupling degree,and analyzed the evolution path of tunnel collapse risk under the influence of human and physical risk factors.At the same time,the influence of random disturbance factors on tunnel collapse risk was considered,and the traditional cusp model was supplemented and improved.Finally,the effectiveness of the risk coupling catastrophe model was verified by an application example of the tailrace pipe maintenance gate chamber on the right bank of Baihetan hydropower station.The results show that the coupling degree of the collapse risk in the tail inspection room is 0.8562,which is in the strength coupling range,and there is a strong coupling effect among the factors.In addition,when the value range of the random disturbance factor is(-1.2878,-0.4272),it will lead to the continuous breeding of potential risks out of control and outbreak,increasing the probability of collapse accidents.