Table 1: Results of photoelastic experiment.

Category Center distance ratioOuter edgesPits bottomJunction
AverageAverage

Single pit01.221.201.211.931.93
Double pits1.01.721.651.682.262.262.262.402.40
1.51.751.721.742.422.372.402.832.83
2.01.551.521.542.222.232.232.792.79
3.01.501.451.482.052.122.091.302.09