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13 13 Loads This section includes background information on the following load types: • Non-uniform loads [§ 13.1] • Trapeziform loads [§ 13.2] • Circular loads [§ 13.3] • Rectangular loads [§ 13.4] • Uniform loads [§ 13.5] • Maintain profile [§ 13.6] • Submerging [§ 13.7] A negative load will decrease the vertical effective stresses in a vertical. A negative time can be used to indicate that the initial load will only affect the initial effective stress. See [chapter 14] for background information on calculating stresses by loading. 13.1 Non-uniform loads The top of a non-uniform load is defined as a layer boundary, and the bottom is equal to the surface level or – when more non-uniform loads have been defined – the top of an underlying non-uniform load. Besides soil raise, you can also use nonuniform loads to model excavations by defining a negative unit weight.
