chipmunks under house slab

Hi, my house sits on a slab-no crawlspace/basement. The chipmunks have started to tunnel under the slab. I do not want them there, I have out up with them in the yard and garden and will not put out any poisons. I have tried a have-a-heart trap with no luck and I know I could never get rid of all of the chipmunks anyway. Just want to discourage  digging under the house. I have put mint oil and red pepper around the house- did not stop them. Has anyone had the same problem? Did you find anything that worked? I can not have a cat and right now also do not have a dog.

Hi J,
A physical deterrent might help. Could you dig down maybe a foot and backfill with rocks? Or maybe just dig down and make an L shape with some flashing or hardware cloth and backfill with dirt. I'm guessing on the 1 foot deep. I know this concept works for digging animals, but you need to know the max depth they will dig in order to make it deep enough.

Hi, my research says their tunnels can go down 2-3 feet- so putting down hardware cloth would be a big job- I found out that used cat litter put down the tunnels may make them go away along with oil of garlic,cinnamon and peppermint. If I can lure them out with peanut butter and then put cat litter down that might work. One website also suggested using fine gravel or sand. The scent of cat is going to be a stronger deterrent . Now I have to find someone with a cat.