掺砂率对膨润土与砂混合物膨胀特性的影响
发布时间：2018-12-10 14:52
【摘要】：膨润土与砂混合物的膨胀特性是评估核废料深层地质处置工程长期性能的重要指标。对比不同膨润土及其与砂混合物的膨胀试验结果可知,对纯膨润土及其低掺砂率混合物,浸水膨胀完成后蒙脱石孔隙比e_m与竖向应力δ_v在双对数坐标内呈惟一的线性关系,利用该线性关系可预测浸水完成后不同竖向应力下的体积变化量及不同初始状态对应的膨胀力;对高掺砂率混合物,在砂骨架形成之前,e_m-δ_v线性关系成立,随着竖向应力的增大,砂骨架形成,对应的e_m值脱离e_m-δ_v线性关系,混合物中掺砂率越大,脱离该线性关系时的竖向应力就越小。砂骨架形成前,砂颗粒被蒙脱石包围,外力由蒙脱石承担,最终变形量由试样中单位体积蒙脱石的含量决定;砂骨架形成后,竖向应力最终由砂骨架和蒙脱石共同承担。利用砂骨架孔隙比的概念可确定各种不同掺砂率混合物形成砂骨架时的应力起偏点。同时,还可确定混合物能够形成砂骨架的掺砂率范围。
[Abstract]:The expansion characteristic of bentonite and sand mixture is an important index to evaluate the long-term performance of deep geological disposal project of nuclear waste. By comparing the expansion test results of different bentonite and its mixture with sand, we can see that for pure bentonite and its mixture with low sand content, There is a unique linear relationship between the porosity ratio of montmorillonite and vertical stress 未 _ v in the logarithmic coordinates after the expansion of water. The linear relationship can be used to predict the volume change of different vertical stresses and the expansion force corresponding to different initial states after the completion of immersion. For the mixture with high sand content, before the sand skeleton is formed, the linear relation of ESP m 未 v is established. With the increase of vertical stress, the sand skeleton is formed, and the corresponding E M value deviates from the e S M 未 v linear relationship. The greater the sand content in the mixture is, the smaller the vertical stress is when the mixture is separated from the linear relationship. Before the sand skeleton was formed, the sand particles were surrounded by montmorillonite, the external force was assumed by montmorillonite, the final deformation was determined by the content of montmorillonite per unit volume in the sample, and the vertical stress was finally borne by the sand skeleton and montmorillonite after the formation of the sand skeleton. By using the concept of sand skeleton void ratio, the stress starting point of sand skeleton can be determined when the mixture of different sand admixtures is formed. At the same time, it can be determined that the mixture can form sand skeleton sand ratio range.
【作者单位】： 上海大学土木工程系;
【基金】：国家自然科学基金(No.41102163;No.41572284)~~
【分类号】：TU443
本文编号：2370774
[Abstract]:The expansion characteristic of bentonite and sand mixture is an important index to evaluate the long-term performance of deep geological disposal project of nuclear waste. By comparing the expansion test results of different bentonite and its mixture with sand, we can see that for pure bentonite and its mixture with low sand content, There is a unique linear relationship between the porosity ratio of montmorillonite and vertical stress 未 _ v in the logarithmic coordinates after the expansion of water. The linear relationship can be used to predict the volume change of different vertical stresses and the expansion force corresponding to different initial states after the completion of immersion. For the mixture with high sand content, before the sand skeleton is formed, the linear relation of ESP m 未 v is established. With the increase of vertical stress, the sand skeleton is formed, and the corresponding E M value deviates from the e S M 未 v linear relationship. The greater the sand content in the mixture is, the smaller the vertical stress is when the mixture is separated from the linear relationship. Before the sand skeleton was formed, the sand particles were surrounded by montmorillonite, the external force was assumed by montmorillonite, the final deformation was determined by the content of montmorillonite per unit volume in the sample, and the vertical stress was finally borne by the sand skeleton and montmorillonite after the formation of the sand skeleton. By using the concept of sand skeleton void ratio, the stress starting point of sand skeleton can be determined when the mixture of different sand admixtures is formed. At the same time, it can be determined that the mixture can form sand skeleton sand ratio range.
【作者单位】： 上海大学土木工程系;
【基金】：国家自然科学基金(No.41102163;No.41572284)~~
【分类号】：TU443
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