考虑压实质量影响的碾压混凝土坝层间结合质量动态评价研究

发布时间：2018-02-12 14:11

本文关键词： 碾压混凝土坝层间结合质量层间间隔时间压实度熵-盲数不确定性　出处：《水利学报》2017年10期 　论文类型：期刊论文

【摘要】：碾压混凝土坝的层间结合质量评价是碾压混凝土坝施工质量控制的重要手段。已有的研究仅考虑层面处理和层间间隔时间对层间结合质量的影响,不仅忽略了压实质量对碾压混凝土坝层间结合质量的影响,而且未能够对大坝层间结合质量进行动态评价。本研究提出实时监控下考虑压实度及其不确定性影响的碾压混凝土坝层间结合质量动态评价模型,模型的建立主要包括3个方面的内容:(1)基于熵-盲数理论对混凝土特性参数进行处理,提出考虑参数不确定性影响的压实度动态计算方法,并将压实度计算结果应用于层间结合质量评价;(2)以混凝土初凝时间与层间间隔时间的差值作为评价指标,解决不同季节条件下评价模型的适用性问题;(3)建立了3个层次的碾压混凝土坝层间结合质量评价指标体系,并基于线性回归分析方法建立了层间结合质量与层间间隔时间、压实度的映射关系。结合实际工程,应用基于实时监控系统建立的评价模型对某碾压混凝土坝的层间结合质量进行了动态评价;结果表明本研究不仅能够在准确评价层间结合质量的同时提供参数不确定性影响等信息,而且层间结合质量动态评价结果更符合实际。
[Abstract]:The evaluation of interlayer bonding quality of RCC dam is an important means of construction quality control of RCC dam. The influence of compaction quality on the interlayer bonding quality of RCC dam is neglected. The dynamic evaluation model of the interlayer bonding quality of RCC dam considering the compaction degree and its uncertainty under real-time monitoring is put forward. The establishment of the model mainly includes three aspects: (1) based on the entropy blind number theory, the concrete characteristic parameters are treated, and the compaction dynamic calculation method considering the influence of parameter uncertainty is put forward. The results of compactness calculation are applied to the quality evaluation of interlaminar bonding. The difference between initial setting time and interlayer interval time of concrete is taken as the evaluation index. To solve the problem of applicability of the evaluation model under different season conditions, the evaluation index system of three layers of RCC dam interlayer bonding quality is established, and the interlayer bonding quality and interlayer interval time are established based on linear regression analysis method. According to the mapping relation of compaction degree, the evaluation model based on real-time monitoring system is applied to evaluate the interlayer bonding quality of a RCC dam. The results show that this study can not only accurately evaluate the interlayer bonding quality, but also provide information such as parameter uncertainty, and the dynamic evaluation results of interlayer bonding quality are more practical.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家重点基础研究发展计划(973计划)(2013CB035904) 国家自然科学基金项目(51439005) 国家自然科学基金创新群体基金项目(51621092)
【分类号】：TV523;TV544.921

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