how does brick block construction deal with ground subsistence and heave?how does it minimise the effects?

Answer 1

Depends on foundations or lack of them. Best solution would be to construct a reinforced concrete pad with horizontal beams underneath to stiffen the pad - a concrete raft.
Then build the brick block construction on the raft. If subsidence occurred then the worst would be the entire structure tilting but you could always underpin it and jack it back the original level.

Answer 2

Brick and block make great building materials, as long as they don't move. Once that happens, the joints crack open, and the strength and integrity of the building are compromised. They need a sturdy foundation to keep this from happening. Usually this is done by building the foundation on a solid soil, and below the frost line.

The soil must either be well drained, so that water doesn't accumulate around the foundation, or else have artificial drains put in to move the water away from the foundation. This is usually done with a sump pump and drain tiles that run along the inside or outside of the foundation.

The frostline is the maximum depth to which the ground freezes in the coldest part of winter. Typically this is about 3-4 feet deep in the northern US, but it can go deeper. Freezing is a problem because water expands when it freezes, and this can put tremendous presssure on the structure. Keeping the foundation in a stable environment makes it less susceptable to moving.

One exception to this is when the building is far enough north to have to deal with permafrost - soil that is frozen year round. Then, the foundation is built on an insulated layer to keep the heat from the building from melting the permafrost. but unless you're far north, like in northern alaska or Canada, this isn't too likely a problem.

Answer 3

if the base of a brick block moved, the structure will develop
hairline crack
try to lay them on a good foundation or reinforced them with wire mesh to make them more stronger

Answer 4

yes because of the gravity of the earth!!