原状与重塑人工冻结粘土抗压强度特征 对比试验研究*

 在相同试验条件下分别对原状和重塑人工冻结粘土进行了单轴无侧限抗压试验。试验结果表明：原状与重塑冻结粘土的破坏特征不同，原状冻结粘土表现为脆性破坏特征，而重塑冻结粘土表现为塑性破坏特征。原状冻结粘土的抗压强度略低于重塑冻结粘土的抗压强度，而前者的弹性模量略高于后者。原状冻结粘土的破坏应变则明显小于重塑冻结粘土的破坏应变。

COMPARATIVE TESTING STUDY ON STRENGTH BEHAVIOUR OF UNDISTURBED AND REMOLDED FROZEN CLAY

Comparative testing study is made on uniaxial compressive strength of undisturbed and remolded frozen clay in the same conditions. The test results show that the compressive strength of the undisturbed frozen clay is slightly lower than that of the remolded frozen clay，and the elastic modulus of the former is slightly higher than that of the later. There are significant differences of the failure mode and failure strain between the undisturbed and remolded frozen clay. The undisturbed frozen clay usually takes on typical brittle failure character，and its failure strain is smaller. Whereas，the remolded frozen clay usually takes on typical ductile plastic failure character，and its failure strain is greater. These differences should be taken into account in the design and construction of artificially frozen ground engineerings.