胶凝砂砾石料静、动力三轴剪切试验研究

通过不同掺量胶凝材料的静动力三轴试验,研究了胶凝砂砾石料的静、动力力学和变形特性,试验结果表明随着胶凝材料掺入量的增加,胶凝砂砾石试样的应力应变曲线逐渐由非线性向线弹性转变,其力学特性宏观上由弹塑性逐渐转变为线弹性,因此采用土工试验测试方法开展其力学特性的研究工作是适宜的。胶凝砂砾料的静、动力力学指标随着胶凝材料掺入量和养护天数的增加产生一定的提高,但增加量随着胶凝材料掺入量的提高而逐渐减缓;胶凝砂砾料的动力残余变形发展过程曲线宏观上与纯砂砾料保持相似,大体上仍符合半对数衰减规律,随围压、固结应力以及动应力的提高,其动永久变形量相应增大,仍可采用沈珠江提出的动力残余变形公式进行描述。

Experimental study on static and dynamic properties of cemented sand and gravel

The static and dynamic triaxial shear tests and deformation tests on CSG (cemented sand and gravel) with different amounts of added cementing materials are performed. The mechanical indexes and parameters obviously increase with mixing of cementing materials and accumulation of curing days. However, the increase will become mild with further adding of the cementing materials. The deformation curve of CSG test sample is similar to that of sand-gravel sample without mixing with any cementing materials, and they both follow the trend of semi-logarithmic attenuation law. The dynamic permanent deformation of CSG increases with the increase of confining pressure, consolidation stress and dynamic stress. Thus this deformation still can be calculated using the constitutive model for dynamic residual deformation proposed by Shen Zhujiang.