Under load, the foundation undergoes deformation. As the load increases, the deformation of the foundation gradually increases. In the initial stage, the stress in the foundation soil is in an elastic equilibrium state and has a safe bearing capacity. When the load increases to the point in the foundation or when the shear stress of each point in a small area reaches the shear strength of the soil in a certain direction plane, shear failure occurs at that point or point in a small area and it is in the ultimate equilibrium state, and the stress in the soil will undergo redistribution. This small-scale shear failure zone is called the plastic zone. The limit equilibrium state of the foundation in a small range can mostly be restored to an elastic equilibrium state, and the foundation can still tend to stability and still have safe bearing capacity. But at this point, the foundation deformation is slightly larger, and the calculated value of deformation must not exceed the allowable value. When the load continues to increase and a large range of plastic zones appear in the foundation, it will indicate insufficient bearing capacity of the foundation and loss of stability. At this point, the foundation reaches its ultimate bearing capacity. Baijian can provide various equipment testing services such as consumer material testing according to corresponding testing standards, and can also design solutions based on customer needs to provide non-standard testing services for customers. Baijian Testing is a comprehensive third-party testing agency that provides customers with one-stop testing services and green solutions. If you have testing needs, please feel free to inquire at any time. Testing cycle: 7-15 working days to issue testing equipment testing reports. Testing fee: Free initial testing, quoted based on customer testing needs and experimental complexity. Sample size: The specific sample size needs to be determined based on the customer's testing project, and you can consult an engineer