特殊地质环境下地铁盾构造价异动测算分析

The Measuring Cost Anaylsis of the Unstable Sheild Structure under the Special Geological Environment

为有效控制地铁盾构因特殊地质而引发的造价异动问题,在确定盾构造价异动成因的基础上,建立PSO-LS-SVM预测模型,并对预测模型的测算路径进行优化,利用优化后的模型预测盾构时长,进而根据盾构掘进定额价、单位时间的费用消耗,最终测定异动造价。选取武汉地铁A号线某标段进行实证分析,结果表明:功效系数的预测误差为-2.78%,异动造价的预测误差为-7.18%。本文研究结果可为特殊地质环境下的地铁盾构异动造价的测算提供参考。

In order to control the unstable cost which caused by the special geology during the subway shield process,the PSO-LS-SVM predictive model is built and the calculation path of the prediction model isoptimized,and then the shield tunneling duration is predicted by using the optimized model.On this basis,according to the fixed tunneling price and the unit time cost consumption,the transaction cost is finally determined.Taking a part of Wuhan metro line A for instance,the result shows that The prediction error of efficiency coefficient is-2.78%,and the prediction error of abnormal cost is-7.18%.The research results of this paper can provide a reference for the calculation of the abnormal construction cost of the subway shield under the special geological environment.