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土体中的渗流-变形耦合问题是岩土工程中极为常见但却易被忽视的问题之一,尤其是对于拥有双孔结构的非饱和压实黏土,渗流-变形耦合过程较为复杂,从微观机理上对耦合全过程进行分析,有助于深入理解土体在渗流-变形耦合作用下的内在机制,为建立理论模型及开展进一步的试验研究奠定基础。基于已有的试验研究成果,并结合相关本构模型的建立及预测,以双孔结构土在常应力条件下的干燥过程为例,揭示了双孔结构非饱和压实黏土在不同阶段的渗流-变形耦合规律,以及耦合全过程的微观机理;对初始干密度对非饱和土渗流-变形耦合特性的影响进行对比分析。研究表明:渗流-变形耦合作用在大孔隙渗流阶段表现较为显著,而在小孔隙渗流阶段则不够明显;初始干密度对渗流-耦合作用的影响仅在大孔隙渗流阶段起作用。
The problem of seepage-deformation coupling in soil is one of the most common but easily overlooked problems in geotechnical engineering. Especially for unsaturated compacted clays with two-hole structure, the seepage-deformation coupling process is complex, The mechanism analysis of the whole coupling process is helpful to understand deeply the intrinsic mechanism of soil under seepage-deformation coupling and lay the foundation for the establishment of theoretical model and further experimental research. Based on the existing experimental results and the establishment and prediction of relevant constitutive models, taking the drying process of double-hole soil under normal stress as an example, the seepage of unsaturated clay with double-hole structure at different stages is revealed - the law of deformation coupling and the micro-mechanism of the coupling process. The influence of the initial dry density on the seepage-deformation coupling of unsaturated soil is analyzed. The results show that the coupling of seepage and deformation is more significant in the stage of macropore seepage but less obvious in the period of small pore seepage. The effect of initial dry density on seepage and coupling is only in the stage of macropore seepage.