含盐量对MBER土壤固化剂加固土性能的影响试验

为分析MBER固化剂在咸水地区、盐渍土地区应用的可能性,通过试验分析了不同NaCl溶液浓度对MBER固化土的无侧限抗压强度、应力—应变关系和弹性模量的影响规律。结果表明,当NaCl浓度低于0.5%时,无侧限抗压强度及弹性模量均随溶液浓度的增加而增加,应力—应变曲线空隙闭合阶段随溶液浓度增加呈减小趋势;NaCl浓度高于0.5%时,无侧限抗压强度及弹性模量均随溶液浓度的增加而降低,应力—应变曲线空隙闭合阶段随溶液浓度增加呈增加趋势;弹性模量与无侧限抗压强度随NaCl浓度变化的趋势基本一致,两者存在较好的线性相关性;适量浓度的NaCl溶液对固化土早期强度的提升效果显著;NaCl浓度低于1%时,可应用于固化土工程建设。研究成果可指导MBER土壤固化剂在盐渍土地区的应用。

Impact Experiment of Salinity on the Stabilized Soil Properties with MBER Soil Stabilizer

In order to analyze the possibility of application and research of MBER in saltwater area and saline soil area, experiment method was used to study the influence of different NaCl concentration on unconfined compressive strength and stress-strain relationship and elastic modulus of MBER compacted soil. The results show that when the NaCl concentration is less than 0.5%, unconfined compressive strength and elastic modulus increase, and stress-strain curves in void closing stage appear downward trend; when the NaCl concentration is higher than 0.5%, unconfined compressive strength and elastic modulus decrease, stress-strain curves in the void closing stage appear upward trend. The variation trend of unconfined compressive strength and elastic modulus is consistent with the change of the NaCl concentration, which is linear correlation. An appropriate concentration of sodium chloride solution significantly enhances the early strength of stabilized soil. Studies suggest that in the actual project it can be used in the construction of stabilized soil when concentration of sodium chloride in water is below 1%.