first of all go to http://getbootstrap.com/customize/#media-queries-breakpoints
Link.
Customize the breakpoint of the media queries as mentioned below
@screen-xs:9999px; @screen-sm:9999px;
Now the breakpoint for the mobile devices will be 9999px and your site will be no more responsive on mobile devices.
After Updating these option just download you package by clicking the link of Compile and download button at the bottom