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采用三点弯曲试验研究了冻土断裂韧度ＫＩｃ的尺寸效应，应用Ｗｅｉｂｕｌ脆性破坏统计理论获得了反映冻土ＫＩｃ尺寸效应的材料常数，即尺寸效应系数α。应用α值进行了ＫＩｃ值理论预测，与实测值相比，其最大误差不超过５％。
The three-point bending test was used to study the size effect of the fracture toughness KIc of frozen soil. The material constants that reflect the size effect of KIc in frozen soil were obtained by Weibul’s brittle failure statistical theory, namely the size effect coefficient α. The KIc value theory is predicted by using the α value, and the maximum error is less than 5% compared with the measured value.