It is generally constructed using materials such as concrete, rubble, or rammed earth, which have good compressive strength but relatively poor tensile and shear strength. It is commonly used in the field of hydraulic engineering (primary discipline), as well as rock mechanics, soil mechanics, and geotechnical engineering (secondary disciplines).

Characteristics:

1. High compressive strength

2. Low tensile, bending, and shear strength

Rigid foundation typically refers to a foundation constructed using materials with high compressive strength and low tensile and shear strength, such as bricks, lime soil, concrete, rammed earth, etc. It is commonly used for small to medium-sized civil buildings with good bearing capacity of the soil and low compressibility. The rigid angle of the foundation refers to the angle between the extension of the foundation and the vertical line of the wall. The extended part of the foundation bottom does not exceed the natural ground of the rigid angle of the foundation material. A foundation made of rigid materials is called a rigid foundation.