论文部分内容阅读
管片错台是盾构施工过程中的常见现象,会引发管片局部破损(开裂)、盾尾漏浆、隧道漏水等风险,而导致错台的主要因素有同步注浆控制、盾构姿态、总推力反力竖向分力、掘进速度、地层条件和拼装作业等。基于风险评估理论,笔者采用广义函数法建立地铁隧道的风险评估体系。利用G1法计算风险指标的权重;由风险指标与错台量的关系,将定性指标予以量化,同时,按照统一标准进行规范化,得到其价值标准;计算系统的总价值,将系统的安全等级划分为优、良、中、差4级。采用此评价体系对地铁隧道进行管片错台风险评估,得出量化的评估结果,进而为选取掘进参数和提出施工对策提供依据。
Segregation of segments is a common phenomenon in the shield construction process, which will lead to the risk of local damage (cracking) of the segments, leakage of the shield tail and water leakage from the tunnel. The main factors leading to the fault are the synchronous grouting control, , The total thrust reaction vertical component, tunneling speed, formation conditions and assembly operations. Based on the theory of risk assessment, the author uses generalized function method to establish risk assessment system of subway tunnels. Using the G1 method to calculate the weight of the risk index; quantifying the qualitative index according to the relationship between the risk index and the wrong station quantity, at the same time, standardizing it according to the uniform standard to get the value standard; calculating the total value of the system, dividing the security level of the system Excellent, good, medium and poor 4. This evaluation system is applied to evaluate the risk of the tube-tunnel dislocation in the subway tunnel, and the quantitative assessment results are obtained, which will provide the basis for selecting the driving parameters and proposing the construction measures.