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基于高液限红黏土的特殊性质,利用CaCO_3和砂对其进行改良,通过直剪试验和无侧限抗压试验探讨两种改良土样的强度指标与掺料比的关系.研究表明:CaCO_3和砂均能改变高液限红黏土的性质.改良后土样的黏聚力和内摩擦角均比改良前高,掺CaCO_3改良土样的黏聚力和内摩擦角在掺料比为40%时达到最大,且整体的黏聚力和内摩擦角值比掺砂改良的土样大.随着掺料比的增大,掺CaCO_3改良土的无侧限抗压强度逐渐减小;而掺砂改良土的无侧限抗压强度则呈先增强后减弱趋势,掺料比为10%时出现最大值;当高液限红黏土的含水率为40%时,CaCO_3改良土最优的掺料比为40%.
Based on the special properties of high liquid limit red clay, CaCO 3 and sand were used to improve the relationship between strength index and the ratio of spiked material through direct shear test and unconfined compressive test.The results show that CaCO 3 And sand can all change the properties of high liquid limit red clay.The cohesion and internal friction angle of modified soil samples were higher than those of the improved ones.The cohesion and internal friction angle of modified CaCO 3 soil samples were in the range of 40 %, And the overall cohesion and internal friction angle values are larger than that of sand-modified soil samples.The unconfined compressive strength of CaCO3-modified soil decreases with the increase of the mixing ratio The unconfined compressive strength of sand-modified soil increases firstly and then decreases, and the maximum value appears when the content of spiked material is 10%. When the moisture content of high-liquid-content red clay is 40%, the optimal content of CaCO_3 modified soil Spice ratio is 40%.