【摘要】：有效控制壩體填筑碾壓質(zhì)量是確保堆石壩工程安全的關(guān)鍵。常規(guī)采用碾壓參數(shù)過程事中控制與事后試坑抽檢相結(jié)合的方法控制堆石壩壓實質(zhì)量，但常規(guī)事中監(jiān)控碾壓參數(shù)的方法不能實現(xiàn)對碾壓機激振頻率、激振力等參數(shù)的實時監(jiān)控，從而無法反映碾壓機械對壩料壓實的做功效率，且控制的碾壓參數(shù)（行車速度、碾壓遍數(shù)、激振力及鋪層厚度）無法直接反映壩料壓實質(zhì)量（壓實度，孔隙率，干密度等）；事后的試坑抽檢用有限個抽樣點不僅難以真實反映整個施工倉面的壓實質(zhì)量，，而且由于試坑檢測結(jié)果不能快速獲得，不易及時反饋控制現(xiàn)場施工。因此，研究能實時反映堆石壩料壓實效果的監(jiān)測指標(biāo)，進而進行快速的質(zhì)量評估具有重要的現(xiàn)實意義。本文主要研究內(nèi)容和成果如下： （1）從碾壓機壓實效果和碾輪振動性態(tài)的角度，分別引進了單位體積壓實功和諧波失真量THD0作為堆石壩料壓實質(zhì)量實時監(jiān)測指標(biāo)，并介紹了這兩個指標(biāo)的定義及其計算方法；基于開發(fā)的堆石壩壓實質(zhì)量實時監(jiān)測系統(tǒng)及現(xiàn)場試驗，設(shè)計了樣本數(shù)據(jù)的獲取方法。 （2）驗證了THD0對堆石壩料壓實質(zhì)量的評估效果，分析了單位體積壓實功、THD0、料性參數(shù)及壓實質(zhì)量的相關(guān)性，量化了各因素對堆石壩料壓實質(zhì)量的影響，為堆石壩壓實質(zhì)量評估模型的建立提供了依據(jù)。 （3）建立了不同變量參數(shù)表征的堆石壩料壓實質(zhì)量的評估模型，發(fā)現(xiàn)了單位體積壓實功與THD0的聯(lián)合評估可有效克服二者單獨評估壩料壓實質(zhì)量的片面性，從而達到更好的評估效果。 （4）提出了基于碾壓機做功的堆石壩壓實質(zhì)量快速評估方法，利用空間插值方法對實時采集計算得到的單位體積壓實功及THD0進行插值，進而結(jié)合建立的評估模型，可獲得全倉面任意位置處的干密度及其不合格區(qū)域分布圖，實現(xiàn)了對堆石壩料壓實質(zhì)量的實時監(jiān)控及全倉面壓實質(zhì)量的快速評估，為堆石壩施工質(zhì)量控制提供了一條新的途徑。
[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.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV641.4;TV541.1

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