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研究了风化砂改良膨胀土的无侧限抗压强度与风化砂掺量、冻融循环次数之间的定性和定量关系。在膨胀土中分别掺入0,10%,20%,30%,40%,50%的风化砂,在经过0,1,3,6,9,12次冻融循环后,在万能试验机上进行无侧限抗压强度测试。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无侧限抗压强度随掺砂比例的增大总体呈现先增大后减小的趋势,当掺砂比例为10%时,风化砂改良膨胀土试样的无侧限抗压强度最大;在同一掺砂比例下,风化砂改良膨胀土的无侧限抗压强度随冻融循环次数的增大而减小,其降低的幅度随冻融循环次数的增大也呈减小的趋势;对试验数据进行回归分析,建立无侧限抗压强度与冻融循环次数之间的数学模型,二者之间表现出良好的自然对数关系,且无侧限抗压强度与冻融循环次数的自然对数呈线性负相关关系。
The qualitative and quantitative relationship between the unconfined compressive strength 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 were weighed 0, 10%, 20%, 30%, 40%, 50% of the weathered sand, after 0,1,3,6,9,12 freeze-thaw cycles, on a universal testing machine Unconfined compressive strength test. The experimental results show that the unconfined compressive strength of the weathered sand-modified expansive soil increases first and then decreases with the increase of the proportion of the sand under the same number of freeze-thaw cycles. When the sand content is 10% , The unconfined compressive strength of weathered sand modified expansive soil samples is the largest. Under the same sand content, the unconfined compressive strength of weathered sand modified expansive soil decreases with the increase of freeze-thaw cycles, which decreases With the increase in the number of freeze-thaw cycles also showed a decreasing trend; regression analysis of the experimental data to establish a mathematical model between the unconfined compressive strength and the number of freeze-thaw cycles, between the two showed a good Natural logarithm, and the unconfined compressive strength and the natural logarithm of the number of freeze-thaw cycles linear correlation was negative.