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首次研究了风化砂改良膨胀土的CBR值与风化砂掺量、冻融循环次数之间的定性和定量关系。膨胀土中分别掺入0%、10%、20%、30%、40%、50%的风化砂,经过0次、1次、3次、6次、9次、12次冻融循环后,在万能试验机上进行CBR值测试。试验结果表明:在同一冻融循环次数下,风化砂改良膨胀土的CBR值随掺砂比例的增大而增大;在同一掺砂比例下,风化砂改良膨胀土的CBR值随冻融循环次数的增大而减小,其减小的速率亦随冻融循环次数的增大而减小,且CBR值与冻融循环次数的自然对数呈较好的线性关系。
For the first time, qualitative and quantitative relationship between CBR value of weathering sand-modified expansive soils and the amount of weathered sand and the number of freeze-thaw cycles were studied. In the expansive soil, the weathered sand of 0%, 10%, 20%, 30%, 40% and 50% were respectively mixed. After 0, 1, 3, 6, 9 and 12 cycles of freezing and thawing, CBR values were tested on a universal testing machine. The results show that the CBR value of weathering sand-modified expansive soils increases with the increase of sand content at the same number of freeze-thaw cycles. CBR values of weathering sand-modified expansive soils increase with the increase of sand content, The decreasing rate also decreases with the increasing number of freeze-thaw cycles, and the CBR value has a good linear relationship with the natural logarithm of the number of freeze-thaw cycles.