UNSTABLE GROUND IS A RISKY FOUNDATION

" Black Cotton Soil might be cracking and unstable causing severe cracks in foundations and walls again might cause buildings to collapse"

Figure [1] The wall thickness
is one and half brickwall,
flemish bond, built on black
cotton soil.A perpendicular
cracks are seen at the face of
the walls [Malakal].

A building on unstable ground has a risky and might result in a collapsed of building. The foundation is affected by severe cracks as shown in figure [1]. Although thick walls built in English and Flemish bonds are applied for the construction [figure 1]; the foundation is yet at risk, the wall may need maintenance.
The cracks may cause undue settlement to the building, making the foundation unstable and the building collapse without taking its expected lifespan.This type of ground is sometimes called Black cotton soil (Vertisols); it is a type of the ground seasonally changing its nature; swelling in wet seasons and shrinking with severe cracks in dry seasons. 
Typical examples of these soil are found in Malakal, Upper Nile state and at Juba-Nabari in Central Equatoria state/ Republic of South Sudan.

Figure 2: Cracks penetrating from the
ground, making walls to collapse.

There is need to share ideas, techniques and approaches for successfully building of houses on loose ground; shared ideas enable us to minimize penetration of the massive cracks into the buildings which causing buildings to collapse.

The  the rate of cracks rapidly expands from the foundation of the building and penetrates to the eaves when the roof weigh intensifies as shown is figure 2 are the effects of the unstable ground movement related to the nature of the soil. Those  building materials which are used in the construction and  yet cracking continue need modification or improvement of skills to minimized the cracks.
 My point of departure is “how shall I build safe and durable houses on loose grounds, and what are the types of buildings, materials, and applicable techniques?