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为实现桩基础施工阶段环境影响的客观评价,优选施工工艺,基于施工阶段环境表现分析系统(Construction Environmental PerformanceAnalysis System,CEPAS)定量评价了施工中常见的人工挖孔灌注桩和长螺旋钻孔管内泵压CFG桩的环境影响,同时分析了环境影响指标和施工工艺。结果表明,1 m~3人工挖孔灌注桩的社会支付意愿值(178.94元)大于长螺旋钻孔管内泵压CFG桩(25.43元),因此,为提高桩基础的绿色施工水平,可以优先采用长螺旋钻孔管内泵压CFG桩。对人工挖孔灌注桩各工序的环境影响分析表明,钢筋加工和混凝土生产工序占总社会支付意愿值的比例最大(99.50%);对长螺旋钻孔管内泵压CFG桩,混合料制备占总社会支付意愿值的比例(89.46%)大于其他工序。因此,改进这些主要环境影响工艺能更有效地降低这两种桩的环境影响。
In order to realize the objective evaluation of the environmental impact during the construction of pile foundation and optimize the construction technology, the construction environmental performance analysis system (CEPAS) is used to quantitatively evaluate the performance of artificial digging and pouring piles and long auger pipe-in-pipe pumps Pressure CFG pile environmental impact, at the same time analyzed the environmental impact indicators and construction technology. The results show that the willingness value of social payment (178.94 yuan) of 1 m ~ 3 artificial digging piles is larger than that of CFG piles (25.43 yuan) in long spiral drilling pipe. Therefore, in order to improve the green construction level of pile foundation, Long spiral drill pipe pressure CFG pile. The analysis of the environmental impact of the various processes of artificial digging bored pile shows that the ratio of steel processing and concrete production process to the total social willingness to pay is the largest (99.50%); The proportion of willingness to pay for the society (89.46%) is greater than other processes. Therefore, improving these major environmental impact processes can more effectively reduce the environmental impact of both piles.