The hydraulic permeability of bentonite suspensions with granular inclusions
The hydraulic permeability of bentonite suspensions with granular inclusions
复制标题
含有颗粒包裹体的膨润土悬浮液的水力渗透率
DOI：
10.1016/0009-2509(94)00145-6
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发表时间：
1994
影响因子：
4.7
通讯作者：
J. Sherwood
中科院分区：
文献类型：
--
作者：
G. Meeten;J. Sherwood
通过过滤膨润土的水性悬浮液来制备压实粘土。一些悬浮液用重晶石称重，其在滤饼中形成颗粒状夹杂物。在一定的压差范围内，测定了脱附率和空隙率。用S（P）和de（P）资料，用外流反演法，得到了增重和未增重悬浮液的扩散率D（e）和渗透率k（e）随时间单调增加的结果。当重晶石体积分数（φB）高达约0.6时，滤饼渗透率k（e）在很大程度上取决于填隙式重晶石-水基质的渗透率。当φB> 0.6时，k（e）随φB的增大而迅速增大，用不相互作用的重晶石颗粒扰动B的简单分析是不充分的。这是由于重晶石颗粒的承载结构阻止了间隙膨润土的压实。
Compacted clays were made by filtering aqueous suspensions of bentonite. Some suspensions were weighted with barite, which formed granular inclusions in the filter cake. The desorptivitySand the void ratioewere obtained over a range of differential pressureP. The outflow inversion method was used, with theS(P) ande(P) data, to obtain the diffusivityD(e) and the permeabilityk(e) for both weighted and unweighted suspensions increases monotonically withe. For barite volume fractions (φb) up to about 0.6 the filter cake permeabilityk(e) is shown to be largely determined by the permeability of the interstitial bentonite-water matrix. For φb> 0.6,k(e) increases rapidly with increasing φb, and a simple analysis in which non-interacting barite particles perturb the permeability of the bentonite gel is inadequate. This is attributed to load-bearing structures of barite particles which prevent the compaction of the interstitial bentonite.