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2 Journal of Theoretical and Applied Mechanics

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Layered mechanics model for surface movement and deformation due to confined aquifer pumping

Zhang Liangliang, Cheng Hua

Journal of Theoretical and Applied Mechanics

2025

Vol. 63 nr 1

59--74

Surface movement and deformation caused by pumping from confined aquifers pose serious threats to the safety and stability of surface buildings. A model for surface movement and deformation due to confined aquifer pumping is established based on the principle of coordinated strata deformation in which the effects of the aquifer thickness, elastic modulus, pumping capacity, and overlying strata thickness are comprehensively considered. The model calculation results for surface subsidence caused by pumping from a confined aquifer in Dezhou City, Shandong Province, China are compared with numerical simulation results to verify the accuracy and rationality of the model.

Study on a concise and unified unstable creep model for rocks

Cheng Yang, Zhang Liangliang

Journal of Theoretical and Applied Mechanics

2024

Vol. 62 nr 3

477--490

The unsteady creep curve of rocks is antisymmetric to the dynamic surface subsidence curve of coal mining. Accordingly, a four-parameter unsteady creep model of rock was established using an analogous reasoning method from the perspective of phenomenology, and a simple method for determining the model parameters was proposed. The test curves of four different types of rocks were in good agreement with the theoretical curves of the model. In particular, the accelerated creep test curves with nonlinear characteristics were consistent with the theoretical curves of the model, verifying the rationality and accuracy of the model.