A short website report entitled:
China Building Military Base on Afghan-Tajik Border (then adds) The plan, if it is realized, promises a deeper Chinese military involvement in Tajikistan, which is necessary as a supply corridor to Badakhshan.
Even more curious:
some media have reported that Chinese military vehicles were using Tajikistan territory to transit to Badakhshan for military patrols...Chinese patrols inside Afghanistan had ended in late 2016. It's not clear whether those patrols were ever restarted, but this base, if realized, would seem to portend much heavier traffic in the future
Link:http://www.eurasianet.org/node/86661

First time I've seen this website, so this helps:
Based in New York, EurasiaNet.org is hosted by Columbia University’s Harriman Institute, one of the leading centers in North America of scholarship concerning Eurasia.
Link:http://www.eurasianet.org/node/14733