堆石料的压缩模量特性研究

Study on Compression Modulus of Rockfill Material

压缩模量作为评价堆石料填筑质量的重要指标,也是大坝变形控制的依据。分析现行压缩模量计算公式存在的问题,通过水布垭室内单轴压缩试验与等应力比三轴试验,建立相同应力路径下考虑泊松比影响的变形模量与压缩模量关系式,并结合水布垭现场荷载板试验与大型压缩试验结果,对变形模量与压缩模量关系进行修正。根据原型大坝的监测沉降量,采用修正后的变形模量与压缩模量的关系式,计算堆石体的压缩模量,更符合实际。

As an important index to evaluate the filling quality of rockfill,the compression modulus is also the basis of dam deformation control.The problems existing in current formulas for calculating compression modulus are analyzed.Based on the indoor uniaxial compression tests and equal stress ratio triaxial tests of the rockfill material in Shuibuya Dam,the relationship between deformation modulus and compression modulus is established considering the influence of Poisson s ratio under the same stress path,and combining with the results of Shuibuya on-site load plate test and large compression test,the relationship between deformation modulus and compression modulus is corrected.According to the settlement monitoring data of Shuibuya Dam,the calculation of compression modulus of the rockfill body by using modified relationship between deformation modulus and compression modulus is more practical.