绿色施工下的深路堑施工群综合承载度分析

Construction group comprehensive bearing capacity analysis of deep cutting under green construction

为寻求最优化"绿色施工—资源—环境—施工活动强度"组合系统,基于理想承载状态下的多维效益,以施工群为研究主体,考虑工程施工中排污因子的短板效应,构建施工群承载机制的木桶模型.采用状态空间法原理,取木桶模型的桶底、桶壁、桶中水作状态轴,以承载状况为研究对象,建立施工群承载度的状态空间模型.结合深路堑施工工艺和专家决策意见遴选出31个变量作为承、压指标,基于Canopy平台,运用随机森林(RF)算法和短板因子度量模型进行赋权,确定施工群的综合承载状况.以兰新高铁的深路堑工程为例,构建考虑短板效应的木桶模型,并基于状态空间模型确定施工群的承载状态,结果显示:绿色施工效果与施工群承载状态的优劣成正相关;针对已有成果中雷达图的对比研究证实了所提出的模型与方法的可行性.

The bucket model of the bearing mechanism of the construction group was established considering the short-board effect of the pollutant discharge factors in the construction process,for the purpose of seeking the optimal combination system of"green construction-resource-environment-construction activity intensity".This model was based on the multi-dimensional benefits under ideal bearing state,taking the construction group as the research subject.According to the principle of state space method,the bucket bottom,bucket wall and bucket water were taken as the status axis,the bearing status was taken as main body and the state of the bearing capacity of the construction group was modeled.Combining the construction of deep cutting and expert decision-making opinions,thirty-one variables were selected as bearing and pressure indexes.With the Canopy platform,the random forest(RF)algorithm and the short board factor measurement model were used to assign weights,and the comprehensive carrying status of the construction group was determined.Taking the deep cutting of Lanxin high-speed railway as an example,a bucket model considering the short-board effect was constructed,the state of the construction group was determined based on the state space model.And it is believed that the green construction effect is positively correlated with the bearing state of the construction group;the comparison of the radar chart in the previous research confirms the feasibility of the proposed model and method.