化-力耦合作用下GMZ01膨润土体变特性研究进展

Advances on Investigations into ChemoMechanical Coupling Effects on the Volume Change Behavior of Compacted GMZ01 Bentonite

摘要:

基于既有研究成果，归纳总结了化力耦合作用下压实GMZ01膨润土体变特性方面的研究进展.随着NaCl和CaCl2入渗溶液浓度的增加，高压实GMZ01膨润土的膨胀力与膨胀变形不断减小；在盐化淡化循环过程中，膨胀/收缩变形主要发生在第1次循环中.压实GMZ01膨润土的压缩指数随NaCl溶液浓度的升高不断降低，随初始饱和应力变化很小；屈服应力随入渗溶液浓度或者初始饱和应力的升高而升高.多离子类型的化学循环、微观机理分析及考虑化学影响的多场耦合研究应该是今后的研究重点.

Abstract:

Based on the existing results from literature, contributions on the chemomechanical coupling effects on the volume change behavior of compacted GMZ01 bentonite were reviewed and presented. Results show that the swelling pressure and swelling strain of the GMZ01 bentonite decrease with the increase of concentrations of salt solutions. For a given concentration of salt solutions cyclically infiltrated, the total vertical displacement of the GMZ01 bentonite specimen mainly happens in the first salinizationdesalinization cycle. The plastic compressibility parameter decreases as the concentration of NaCl solution increases, the vertical stress applied during the saturation process has negligible influence on the compressibility parameter; while the yield stress increases as the concentration of NaCl solution or the vertical stress applied on saturation increases. Clearly, investigations on cyclically salinizationdesalinization with multiple cations solutions, the mechanism of microstructure and the multifield coupling tests with consideration of chemical effect should be conducted in the future.