温度对水溶性有机材料改良砂土的力学特性试验研究
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国家自然科学基金面上项目(41877212)


Experimental Study on Mechanical Properties of Sand Soil Modified by Water-soluble Organic Material at Temperature
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    摘要:

    聚氨酯型固化剂与水反应生成的固化膜能有效提高砂土的强度,为了研究温度对固化剂改良砂土效果的影响,开展了无侧限抗压试验,分析了不同温度条件下砂土强度随密度和固化剂含量的变化规律,并就温度的影响机理进行了深入分析。试验结果表明:温度对固化剂的改良效果具有明显的影响,温度不变的情况下,无侧限抗压强度特性随密度和固化剂含量的增加而增大。在温度较高时(≥ 35℃),固化膜失水收缩,弹性增大、强度提高,能较大程度地提高砂土强度;在温度较低时(≤-10℃),固化膜被冻结而强度提高,进而提高砂土强度;两种极端温度条件下,固化剂改良效果都有提高,但高温条件效果更明显。

    Abstract:

    The elastic membrane generated from the reaction between polyurethane stabilizer and water can effectively improve the strength of sand. In order to study the effect of temperature on the improvement of polyurethane stabilizer,unconfined compression test was carried out. The variation of sand strength with different density and polyurethane stabilizer content at different temperatures was analyzed and the influence mechanism of temperature is analyzed in depth. The test results show that temperature has obvious influence on the improvement of polyurethane stabilizer and the unconfined compressive strength increases with the increase of density and polyurethane stabilizer content at constant temperature. When the temperature is higher (≥ 35℃),soil moisture decreases and the cured film shrinks causing the increase of its elasticity and strength,which can greatly improve the the strength of sand. When the temperature is lower (≤ 10℃),the cured film is frozen and the strength increases,which can further improve the strength of the sand;Under two extreme temperature conditions,the effect of polyurethane stabilizer is improved,but the effect is more obvious at high temperature.

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王龙威,石霄,江灿珲,陈景,李柳扬.温度对水溶性有机材料改良砂土的力学特性试验研究[J].河北工程大学自然版,2019,36(4):72-77

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  • 收稿日期:2019-10-24
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  • 在线发布日期: 2019-12-31
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