10″ 90 degree elbow requires 11,200 PSI thrust block. Sand + gravel with clay is 2,000. What size thrust block would be required for 10″ 90 degree elbow in soil which is sand + gravel with clay?

10″ 90 degree elbow requires 11,200 PSI thrust block. Sand + gravel with clay is 2,000. What size thrust block would be required for 10″ 90 degree elbow in soil which is sand + gravel with clay?