淤填黏土铺盖裂缝大变形固结试验研究

Study on large deformation consolidation tests for warping clay with blanket cracks

Gibson的一维大变形固结理论存在很大的局限性,为符合特定的需求,不断对Gibson理论进行修正。本文针对黏土铺盖裂缝的淤填处理问题,对渗压作用下的淤填黏土的固结机理进行了研究。首先,推导出有限应变渗压固结理论模型,再基于有限应变固结理论分别推导出以超孔隙水压力和孔隙比表示的有限应变渗压固结偏微分方程,并通过设计模型试验模拟了裂缝处淤填固结的全过程,同时对理论模型和固结偏微分方程进行了验证,最后以模型试验结果为依据指导了现场试验。

The Gibson one-dimensional large strain consolidation theory has the very big limitation, and to meet the specific needs the Gibson theory should be constantly revised. The problems on the clay blanket cracks in the warping processing under the osmotic pressure consolidation of warping clay are studied. First of all, the finite strain consolidation theory model for seepage pressure is derived and then based on the finite strain consolidation theory the differential equation for the finite strain osmotic pressure consolidation is derived with the excess pore water pressure and pore ratio. Through the design and model tests the crack silting consolidation process is simulated, and at the same time the theory model and the consolidation partial differential equations are validated. Finally, the model test results are used to guide the field tests.