摘要
为探究冻融循环下粉煤灰、氯化钙材料在固化硫酸盐渍土方面的应用效果,设计室内正交试验和对照试验,分析单掺和复掺时各个因素对盐渍土抗冻融循环下的强度指标和盐冻胀量的影响。结果表明:1)单掺粉煤灰、氯化钙均对固化硫酸盐渍土盐冻胀有抑制作用,但复掺固化剂对盐胀的抑制作用更优;2)多次冻融循环作用对固化硫酸盐渍土的黏聚力影响较大,变幅为48.88 kPa,而对内摩擦角影响较小,变幅仅为4.09°;多次冻融循环条件下,复掺固化剂的强度指标要高于单掺;3)多次冻融循环下,固化硫酸盐渍土的盐冻胀率均随含盐量的增加而增大,而黏聚力则随含盐量的增加总体呈降低趋势。综合分析认为,复掺15%粉煤灰和4%氯化钙既可有效抑制固化硫酸盐渍土盐冻胀的发生,又能使土体具有较高的黏聚力。
In order to explore the application effect of calcium chloride and fly ash on the solidified sulfate soil under the freeze thaw cycle, the orthogonal test and control test are designed, and influence of each factor on strength index and salt frost heave under anti-freeze-thaw cycle of sulfate soil are analyzed.The results show that: 1) The single addition of fly ash and calcium chloride can inhibit the salt heave of solidified sulfate soil, but the compound addition of curing agent has a better inhibitory effect on the salt heave;2) Multiple freeze-thaw cycles have a great influence on the cohesion of solidified sulfate soil, with a variation amplitude of 48.88 kPa, but have little influence on the internal friction angle, with a variation amplitude of only 4.09 °;Under the condition of multiple freeze-thaw cycles, the strength index of compound curing agent is higher than that of single curing agent.3) Under multiple freeze-thaw cycles, the salt frost heave rate of solidified sulfate soil increases with the increase of salt content, while the cohesion decreases with the increase of salt content.The comprehensive analysis shows that adding 15% fly ash and 4% calcium chloride can not only effectively inhibit the occurrence of salt frost heave of solidified sulfuric acid saline soil, but also make the soil have high cohesion.
作者
马桂平
张卫兵
周瑞璞
吴向峰
管小龙
MA Guiping;ZHANG Weibing;ZHOU Rui;WU Xiangfeng;GUAN Xiaolong(Schoolof Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,Ningxia,China;Engineering Research Center of Ministry of Education for the Efficient Use of Modern Agricultural Water Resources in Ningxia Arid Region,Yinchuan 750021,Ningxia,China)
出处
《工程建设》
2022年第6期1-7,共7页
Engineering Construction
基金
宁夏回族自治区重点研发计划一般项目(2018BEE03005)
宁夏高等学校一流学科建设(国内一流建设学科)项目(NXYLXK2017A03)。
关键词
固化硫酸盐渍土
冻融循环
强度
盐冻胀
solidified sulfate soil
freeze thaw cycle
strength
salt frost heave
