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高放废物深地质处置中,缓冲回填材料的抗剪性能对处置库的安全设计、施工及运营有重要的影响。本文从工程应用的角度出发,测试不同掺砂率时膨润土-砂混合物标准击实样在最优含水率条件下的抗剪强度指标。研究结果表明:随着掺砂率的增大,膨润土-砂混合物的抗剪强度指标略有下降;纯膨润土的抗剪强度指标随着干密度的增大而增大,随着含水率的增大而减小。通过测试和分析不同干密度和含水率时纯膨润土的抗剪强度指标,引入有效粘土密度和有效含水率的概念,对最优含水率条件下不同标准击实样的抗剪强度指标进行分析。
In the deep geological disposal of high level radioactive waste, the shearing performance of cushioned backfill materials has an important impact on the safety design, construction and operation of the repository. In this paper, from the perspective of engineering application, the shear strength index of bentonite-sand mixture under the optimal moisture content was tested under different sand content. The results show that with the increase of sand content, the shear strength of bentonite-sand mixture decreases slightly. The shear strength of pure bentonite increases with the increase of dry density. With the increase of water content Big and small. Through testing and analyzing the shear strength index of pure bentonite with different dry density and water content, the concept of effective clay density and effective moisture content is introduced to analyze the shear strength index of different standard compacted samples under the optimal moisture content.