1. You could use rel=nofollow on links pointing to pages variations.

2. If you can you could also dynamically  add a meta noindex, no follow, when a variant of the initial page is generated.

3. You could also add a link rel=canonical pointing to the initial page, this will tell bots that this page is the original page.

In other word, you have to tell crawlers when it is a page variant and that you don't want him to index them.

You could use Linksleuth to crawl your site. It will tell you how many pages it found, then match it against the total of pages google has indexed.

24 hours is a short time and probably google did not reindex or even looked at your new robot.txt

Webmaster tools is way slower than bing tools, so be patient.

As a rule of thumb, I wait at least a week with google before worrying (my 2 cents)

You could use Linksleuth to crawl your site. It will tell you how many pages it found, then match it against the total of pages google has indexed.

24 hours is a short time and probably google did not reindex or even looked at your new robot.txt

Webmaster tools is way slower than bing tools, so be patient.

As a rule of thumb, I wait at least a week with google before worrying (my 2 cents)

1. You could use rel=nofollow on links pointing to pages variations.

2. If you can you could also dynamically  add a meta noindex, no follow, when a variant of the initial page is generated.

3. You could also add a link rel=canonical pointing to the initial page, this will tell bots that this page is the original page.

In other word, you have to tell crawlers when it is a page variant and that you don't want him to index them.