This appears to be more serious than it really is. The fractures you see are actually cracks in a thin concrete-plaster coating that was applied by the builder or his foundation contractor to hide the rocks and gravel in the slab. This is not as it appears. It appears to be a series of fractures in the slab. Not so. Again, hot Texas summers at work here and the fact that a skim coating of concrete will not bond to the slab for all the obvious reasons and then some. If the slab were broken in as many places as this picture suggests, one would feel the rocks and gravel under the carpet after a number of years.