缓冲回填材料的室内制样方法研究

对缓冲回填材料的拌样、湿化、养护与压制过程进行了研究,提出了一套缓冲回填材料小尺度人工制样工艺(即采用分步搅拌法将石英砂均匀掺入膨润土,搅拌结束后,采用喷雾法湿化材料至目标含水率)及4种压(击)实方法(恒定击实能动力击实法、变击实能动力击实法、恒定压实能静力压实法和变压实能静力压实法).对变压实能静力压实法压制的试样进行检验后发现,试样中部的干密度略高于试样的干密度平均值.利用三变量正交试验设计对缓冲回填材料的岩土性质进行研究后认为,变压实能静力压实法可同时满足室内试验及原位试验研究的目的.

Method for Sample Preparation of Buffer/Backfilling Materials in Laboratory

A complete set of manual sample preparation methods and four compaction methods are proposed, based on the study of the mixing, humidifying, maintenance and compaction of buffer/backfilling materials. Sand was added into bentonite by step by step mixing method firstly. Then the spray on process was employed to achieve the targeted water content. The four compaction methods included dynamic compaction method with constant compaction energy, dynamic compaction method with changing compaction energy, static compaction method with constant compaction energy and static compaction method with changing compaction energy. It is found that the dry density of middle part of the sample is slightly higher than that of entire sample. Different types of samples are proposed to research the geotechnical properties of the mixed material by three variable orthogonal experimental design. It is concluded that the static compaction method with changing compaction energy can meet the requirement for both engineering and experimental research purposes.