EXPERIMENTATION METHOD FOR TYPE I STRESS INTENSITY FACTOR TEST WITH FROST HEAVING FORCE PERIODIC CHANGES TAKEN INTO CONSIDERATION

摘要

An experimentation method for a type I stress intensity factor test with frost heaving force periodic changes taken into consideration, the steps being 1: preparing a specimen, using waterjet cutting on the specimen to approximately simulate a non-penetrating rock mass fracture; step 2: vacuum saturating the specimen; step 3: affixing a strain gauge in the range of a non-elastic area at a tip of the specimen; step 4: placing the specimen into a rock mass (1) fracture frost heaving experiment box (5), using a pressurizing apparatus (4) to pressurize balloons on either side of the frost heaving experiment box (5), shutting a valve and removing a pipe, then placing the frost heaving experiment box (5) holding the specimen into a water tank, thus allowing water to immerse the specimen; and step 5: placing the water tank and the frost heaving experiment box (5) holding the specimen together into a high-low temperature alternating experiment box (7) to start a freeze-thaw cycle experiment. By means of effectively blocking water when fracture freezing the specimen and replenishing water in a timely manner when thawing, a realistic simulation of frozen and thawed states of a non-penetratingly fractured rock mass is allowed, thus allowing a fractured rock mass freeze-thaw damage result to be expressed with increased accuracy.