The pilot was landing at a 900-foot long, remote off-airport site, in a tailwheel-equipped airplane. He said during the landing roll, the airplane veered slightly to the right, and then it went down a small embankment. The pilot said he inadvertently applied heavy braking, and both wheels "locked" and the airplane subsequently nosed over, sustaining substantial damage to the wings and wing lift struts. The pilot noted that there were no preaccident mechanical anomalies with the airplane.