【摘要】：膨潤土與砂混合物的膨脹特性是評估核廢料深層地質(zhì)處置工程長期性能的重要指標(biāo)。對比不同膨潤土及其與砂混合物的膨脹試驗結(jié)果可知,對純膨潤土及其低摻砂率混合物,浸水膨脹完成后蒙脫石孔隙比e_m與豎向應(yīng)力δ_v在雙對數(shù)坐標(biāo)內(nèi)呈惟一的線性關(guān)系,利用該線性關(guān)系可預(yù)測浸水完成后不同豎向應(yīng)力下的體積變化量及不同初始狀態(tài)對應(yīng)的膨脹力;對高摻砂率混合物,在砂骨架形成之前,e_m-δ_v線性關(guān)系成立,隨著豎向應(yīng)力的增大,砂骨架形成,對應(yīng)的e_m值脫離e_m-δ_v線性關(guān)系,混合物中摻砂率越大,脫離該線性關(guān)系時的豎向應(yīng)力就越小。砂骨架形成前,砂顆粒被蒙脫石包圍,外力由蒙脫石承擔(dān),最終變形量由試樣中單位體積蒙脫石的含量決定;砂骨架形成后,豎向應(yīng)力最終由砂骨架和蒙脫石共同承擔(dān)。利用砂骨架孔隙比的概念可確定各種不同摻砂率混合物形成砂骨架時的應(yīng)力起偏點。同時,還可確定混合物能夠形成砂骨架的摻砂率范圍。
[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.
【作者單位】： 上海大學(xué)土木工程系;
【基金】：國家自然科學(xué)基金(No.41102163;No.41572284)~~
【分類號】：TU443

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