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本文以抽水蓄能电站工程区花岗岩蚀变土为对象,掌握其基本物性指标,并探讨该土体作为坝体填筑材料在95%压实系数下渗透、变形和强度等特性,进一步分析和计算了试样的应力应变关系及邓肯—张模型参数。试验结果表明:当试样压实系数为95%时,属于低渗透性,中等压缩性,且有一定的粘聚力及较高的内摩擦角;其应力应变表现出硬化特性,剪切初期表现出剪缩性,当应变达到某一定值后,表现出剪胀特性;利用邓肯—张模型能较好地反应土体的应力应变本构关系,并确定相关参数。研究成果为实际工程中利用花岗岩蚀变土提供了参考依据。
In this paper, the granite rock alteration soil in the pumped storage hydropower station project area is taken as an object to grasp its basic physical and chemical properties, and to investigate the characteristics of permeability, deformation and strength of the dam as filling material of the dam under 95% compaction coefficient. The stress-strain relationship and Duncan-Chang model parameters were calculated. The test results show that when the compaction coefficient of the sample is 95%, it belongs to low permeability and medium compressibility, and has certain cohesion and high internal friction angle. The stress and strain show hardening characteristics, and the initial stage of shearing Which shows the shearing property. When the strain reaches a certain value, it shows dilatancy characteristics. The Duncan-Chang model can well reflect the stress-strain constitutive relations of soil and determine the relevant parameters. The research results provide a reference for using granite alteration soil in practical engineering.