Approach for Measuring Swelling Stress of Buffer Backfilling Material

摘要

The characteristics of swelling stress of buffer backfilling material have been studied by force-balance method and constant volume test method in this paper. The constant volume test apparatus was designed by the authors. Results show that swelling stress changing with time is a little different between the two methods. The value of swelling stress measured by constant volume test is more accurate; besides, uptaking water with time could also be monitored by constant volume test. The constant volume test method is more suitable for measuring the swelling stress of buffer backfilling material.