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为研究击实黏性土断裂韧度,研制了土体断裂韧度测试新仪器,通过新仪器对黏性土进行了断裂韧度测试,讨论了试验方法的合理性;并结合前人的研究成果探讨了土体断裂韧度与抗拉强度之间的关系。结果表明,击实黏性土中的裂缝扩展规律符合线弹性断裂特性,可采用线弹性断裂理论对其进行研究;击实黏性土断裂韧度与抗拉强度之间存在线性关系;但土体颗粒性质、颗粒机配、试样含水量、试验方法等均对土体断裂韧度有影响,需进行更深入的研究。
In order to study the fracture toughness of the clayey soil, a new instrument for testing the fracture toughness of the soil was developed. The fracture toughness of the clayey soil was tested by a new instrument. The rationality of the test method was discussed. Combined with the previous studies The results discussed the relationship between soil fracture toughness and tensile strength. The results show that the rule of crack propagation in compacted clayey soil accords with the linear elastic fracture characteristics and can be studied by linear elastic fracture theory. There is a linear relationship between fracture toughness and tensile strength of compacted clayey soil. However, Body particle properties, particle size distribution, sample water content, test methods and so on have an impact on the fracture toughness of the soil, which needs further study.