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有效控制坝体填筑碾压质量是确保土石坝工程安全的关键。常规采用碾压参数过程控制与事后试坑抽检相结合来控制土石坝压实质量的方法,不能在碾压过程中直接控制坝料压实质量(如压实度、干密度、孔隙率等),且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。本文基于碾轮振动性态及坝料压实机理分析,提出了土石坝料压实质量的实时表征指标——压实监测值CV(Compaction Value),研制开发了相应的车载实时监测装置。基于实时监测的CV,并考虑坝料的级配及含水率,提出了土石坝料压实质量(压实度)的全仓面快速评估方法。实际工程应用表明,CV与坝料压实度之间存在很强的相关性,所建立的压实度回归模型精度较高。本文方法可实现土石坝压实质量全仓面的快速评估,有效避免试坑抽检的片面性及滞后性,为土石坝施工质量控制提供了一条新的途径。
Effectively controlling the quality of dam compaction and rolling is the key to ensure the safety of earth-rock dam. Conventionally, the method of controlling the compaction quality of earth-rock dams by combining the process control of roller compaction parameters and the post-test pit sampling can not directly control the compaction quality (such as compaction degree, dry density and porosity) of the dam material during the rolling process. , And using a limited number of sampling points is not only difficult to truly reflect the compaction quality of the entire construction surface, but also because test pit test results can not be quickly obtained, it is not easy to feedback control of on-site construction. In this paper, based on the vibration state of roller mill and the compaction mechanism analysis of dam material, a compaction value (compaction value) CV, which is a real-time characterization index of compaction quality of earth and rock dam material, is put forward. Corresponding vehicle real-time monitoring equipment is developed. Based on the real-time monitoring of CV and taking into account the gradation and moisture content of the dam material, a rapid assessment method of the entire surface of the compacted dam material (compaction degree) is proposed. The actual engineering application shows that there is a strong correlation between CV and dam compaction degree, and the compaction degree regression model established has high precision. The method of this paper can make a quick assessment of the full face of compaction mass of earth-rock dam, avoid the one-sidedness and hysteresis of sampling pit effectively, and provide a new approach for the construction quality control of earth-rock dam.