基于碾压机做功的堆石坝压实质量实时监测与快速评估方法及应用

发布时间：2018-09-18 08:22

【摘要】：有效控制坝体填筑碾压质量是确保堆石坝工程安全的关键。常规采用碾压参数过程事中控制与事后试坑抽检相结合的方法控制堆石坝压实质量，但常规事中监控碾压参数的方法不能实现对碾压机激振频率、激振力等参数的实时监控，从而无法反映碾压机械对坝料压实的做功效率，且控制的碾压参数（行车速度、碾压遍数、激振力及铺层厚度）无法直接反映坝料压实质量（压实度，孔隙率，干密度等）；事后的试坑抽检用有限个抽样点不仅难以真实反映整个施工仓面的压实质量，，而且由于试坑检测结果不能快速获得，不易及时反馈控制现场施工。因此，研究能实时反映堆石坝料压实效果的监测指标，进而进行快速的质量评估具有重要的现实意义。本文主要研究内容和成果如下：（1）从碾压机压实效果和碾轮振动性态的角度，分别引进了单位体积压实功和谐波失真量THD0作为堆石坝料压实质量实时监测指标，并介绍了这两个指标的定义及其计算方法；基于开发的堆石坝压实质量实时监测系统及现场试验，设计了样本数据的获取方法。（2）验证了THD0对堆石坝料压实质量的评估效果，分析了单位体积压实功、THD0、料性参数及压实质量的相关性，量化了各因素对堆石坝料压实质量的影响，为堆石坝压实质量评估模型的建立提供了依据。（3）建立了不同变量参数表征的堆石坝料压实质量的评估模型，发现了单位体积压实功与THD0的联合评估可有效克服二者单独评估坝料压实质量的片面性，从而达到更好的评估效果。（4）提出了基于碾压机做功的堆石坝压实质量快速评估方法，利用空间插值方法对实时采集计算得到的单位体积压实功及THD0进行插值，进而结合建立的评估模型，可获得全仓面任意位置处的干密度及其不合格区域分布图，实现了对堆石坝料压实质量的实时监控及全仓面压实质量的快速评估，为堆石坝施工质量控制提供了一条新的途径。
[Abstract]:The key to ensure the safety of rockfill dam is to control the quality of compaction effectively. The compaction quality of rockfill dam is controlled by the method of combination of in-process control of roller compaction parameter process and spot check of post-test pit, but the method of monitoring roller compaction parameter can not realize real-time monitoring of exciting frequency, exciting force and other parameters of roller compaction machine. Therefore, it can not reflect the work efficiency of rolling machinery on dam compaction, and the controlled rolling parameters (driving speed, rolling times, exciting force and layer thickness) can not directly reflect the compaction quality of dam material (compactness, porosity, dry density, etc.); The limited sampling points used in post-test pit testing not only can not reflect the compaction quality of the whole construction silo, but also are difficult to control the site construction in time because the test results can not be obtained quickly. Therefore, it is of great practical significance to study the monitoring index which can reflect the compaction effect of rockfill dam in real time, and then to evaluate the quality of rockfill dam quickly. The main contents and achievements of this paper are as follows: (1) from the angle of compaction effect of roller and vibration behavior of roller, the unit volume compaction work and harmonic distortion THD0 are introduced as the real-time monitoring index of compaction quality of rockfill dam, respectively. The definition and calculation method of these two indexes, the real-time monitoring system of compaction quality of rockfill dam and the field test are introduced. The method of obtaining sample data is designed. (2) the evaluation effect of THD0 on compaction quality of rockfill dam is verified, and the relativity of unit volume compaction work THD 0, material property parameter and compaction quality is analyzed. The influence of various factors on the compaction quality of rockfill dam is quantified, which provides the basis for the establishment of compaction quality evaluation model of rockfill dam. (3) the evaluation model of compaction quality of rockfill dam with different variable parameters is established. It is found that the joint evaluation of unit volume compaction work and THD0 can effectively overcome the one-sidedness of evaluating the compaction quality of dam materials separately. In order to achieve better evaluation results. (4) A rapid evaluation method for compaction quality of rockfill dam based on the work done by roller is proposed. The unit volume compaction work and THD0 obtained by real-time acquisition and calculation are interpolated by spatial interpolation method. Combined with the established evaluation model, the dry density and its unqualified area distribution map at any position of the whole silo surface can be obtained, and the real-time monitoring of the compaction quality of the rockfill dam and the rapid evaluation of the compaction quality of the whole silo surface can be realized. It provides a new way for quality control of rockfill dam construction.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV641.4;TV541.1

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