【摘要】 通过低温动三轴试验,研究青藏铁路中重塑冻结粉质黏土的动剪切模量的变化规律及其主要因素。研究表明,冻土的最大动剪切模量随负温降低而显著增大,动剪切模量比随轴向荷载单级振次增加而有所增大,随负温降低而降低,随围压增加趋于一致。负温是冻土动力性能的一个极其重要的影响因素,因而寒区工程应引起足够的重视。研究结果对于合理认识冻土动力性能具有一定意义,也为进一步开展多年冻土场地工程地震安全性评价积累部分基础资料。更多还原

【Abstract】 The dynamic shear modulus variation and its main affecting factors are studied on the basis of the results of low-temperature dynamic triaxial test of frozen silty clay with remolded samples taken from Qinghai-Xizang Railway.It is indicated that the maximum dynamic shear modulus increases evidently with temperature decreasing.Dynamic modulus ratio increases with axial vibration times increasing,decreases with temperature decreasing.Shear modulus ratio does not vary evidently with confining pressure increasing.Temperature is one of the main affecting factors of dynamic properties of frozen soil,so full regard should be paid to cold region engineering.It is benefit to acknowledge the dynamic property of frozen soil.It also provides some important data for further developing engineering earthquake security evaluation in permafrost region.更多还原