The paleoweathered rock in the K₁/J₂ unconformity contact zone (K₁/J₂ PWR) in the Ordos Basin is the key aquiclude under the Cretaceous deposit. Creep deformation and permeability evolution of K₁/J₂ PWR in the bending zone under triaxial unloading–loading confining pressure (TULCP) path was carried out using the GDS triaxial experimental system, which is of great value for scientific interpretation of leakage from Cretaceous aquifers and regional water-level decline. Results show that under TULCP, the creep strain and the creep strain rate of the K₁/J₂ PWR exhibits three stages: transient strain, primary creep, and second creep. In the confining pressure unloading (CPU) creep stage, the creep strain increases continuously with the step-by-step of CPU; however, the change in permeability is not monotonic. In the confining pressure loading (CPL) creep stage, the creep strain decreases in the transient strain stage and slightly increases in the primary creep and second creep stages, as well as the permeability decreases continuously with the step-by-step of CPL. The average creep rate and average permeability in the second creep stage increase with the CPU and decrease with the CPL, and the relationship between the two can be expressed by an exponential function. Meanwhile, the creep strain increment increases with the increase in the clay mineral contents (CMC) and deviatoric stress. With the increase in the CMC, the rate of increase of the average permeability in the second creep stage increase during the CPU creep stage, and the rate of decrease of the average permeability in the second creep stage increase during the CPL creep stage.

鄂尔多斯盆地K ₁ / J ₂不整合接触带（K ₁ / J ₂ PWR）古风化岩是白垩系沉积下的关键隔水层。利用GDS三轴实验系统开展了三轴卸载-加载围压(TULCP)路径下弯曲区K 1 / J 2 压水堆蠕变变形和渗透率演化，对白垩纪含水层渗漏的_科学解释具有_重要价值和区域水位下降。结果表明，在 TULCP 下， K ₁ / J的蠕变应变和蠕变应变率_2个PWR 表现出三个阶段：瞬态应变、初级蠕变和二次蠕变。在围压卸载（CPU）蠕变阶段，蠕变应变随着CPU的逐步增加而不断增加；然而，渗透率的变化不是单调的。在围压加载（CPL）蠕变阶段，蠕变应变在瞬态应变阶段减小，在初级蠕变和第二蠕变阶段略有增加，渗透率随着CPL的逐步增加而不断降低。第二蠕变阶段的平均蠕变速率和平均渗透率随CPU的增加而增加，随CPL的增加而降低，两者之间的关系可以用指数函数表示。同时，蠕变应变增量随着粘土矿物含量（CMC）和偏应力的增加而增加。