几种固化剂对渠道盐渍土地基力学性能影响的试验研究
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摘要
【目的】明晰水泥、粉煤灰、硅灰、镁渣作为渠道盐渍土地基固化剂的固化效果。【方法】设计了水泥、粉煤灰、硅灰、镁渣固化剂3种掺量的正交试验,通过不同龄期的三轴试验、压缩试验和干缩试验研究了其力学性能。【结果】(1)7 d龄期固化盐渍土黏聚力最大可以增大2.97倍,内摩擦角最大可以增大3.78倍;(2)28 d龄期固化盐渍土黏聚力最大可以增大4.81倍,内摩擦角最大可以增大5.84倍;(3)28 d龄期5次冻融循环后,素土试件破坏,无抗剪强度,固化盐渍土黏聚力最大损失了23.1%,最小损失了5.1%,内摩擦角最大损失了25.0%,最小基本无损失。(4)当水泥掺量为3%和5%,硅灰掺入剂量适中,固化盐渍土的干缩系数较小。【结论】综合考虑渠道盐渍土地基抗冻胀、抗干缩和抗剪强度的要求,建议采用高掺量水泥和粉煤灰,中掺量硅灰和低掺量镁渣固化渠道盐渍土地基较为适宜。
【Objective】This paper presents an experimental study on the efficiency of four consolidation agents in improving mechanical properties of salinized foundation soil of channel.【Method】The four consolidation agents we considered were cement, fly ash, silica fume and magnesium slag. For each agent, we designed three soil amendments based on the orthogonal test. Following the amendment, we progressively measured the properties of the amended soil using triaxial, compression and shrinkage test.【Result】Compared to the original soil, the cohesion and fictional angle of the solidified soil could increase up to 2.97 times 3.78 times respectively 7 days after the amendment, and up to 4.81 times 5.84 times respectively 28 days after the amendment. After five freezethaw cycles after 28 days, soil without amendment collapsed, while the solidified soils still had their cohesion increase by 5.1%～23.1% and frictional angle by 0%～25.0%. When amending the soil with 3% and 5% of cement,the contraction coefficient of the soil was smaller than that amended by a moderate amount of silica fume.【Conclusion】Considering the requirement against frost heave, dry shrinkage and shear strength of the salinized foundation soil of channel, our experimental results suggested that amending the soil with cement and fly ash at high ratio can achieve the goal. Amending the soil with silica fume at moderate ratio or magnesium slag at low ratio is also able to solidify the soil to a satisfactory level.
【Objective】This paper presents an experimental study on the efficiency of four consolidation agents in improving mechanical properties of salinized foundation soil of channel.【Method】The four consolidation agents we considered were cement, fly ash, silica fume and magnesium slag. For each agent, we designed three soil amendments based on the orthogonal test. Following the amendment, we progressively measured the properties of the amended soil using triaxial, compression and shrinkage test.【Result】Compared to the original soil, the cohesion and fictional angle of the solidified soil could increase up to 2.97 times 3.78 times respectively 7 days after the amendment, and up to 4.81 times 5.84 times respectively 28 days after the amendment. After five freezethaw cycles after 28 days, soil without amendment collapsed, while the solidified soils still had their cohesion increase by 5.1%～23.1% and frictional angle by 0%～25.0%. When amending the soil with 3% and 5% of cement,the contraction coefficient of the soil was smaller than that amended by a moderate amount of silica fume.【Conclusion】Considering the requirement against frost heave, dry shrinkage and shear strength of the salinized foundation soil of channel, our experimental results suggested that amending the soil with cement and fly ash at high ratio can achieve the goal. Amending the soil with silica fume at moderate ratio or magnesium slag at low ratio is also able to solidify the soil to a satisfactory level.
引文
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[14]吕擎峰,申贝,王生新,等.水玻璃固化硫酸盐渍土强度特性及固化机制研究[J].岩土力学,2016,37(3):687-693,727.
[15]杨晓华,王永威,张莎莎.基于调节因素的盐渍土盐胀率随含水率变化规律研究[J].中国公路学报,2016,29(10):12-19.
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[18]方秋阳,柴寿喜,李敏,等.冻融循环对固化盐渍土的抗压强度与变形的影响[J].岩石力学与工程学报,2016,35(5):1 041-1 047.
[19]王文华,万健.冻融循环作用对碳酸盐渍土单轴抗压强度影响的试验研究[J].长春工程学院学报(自然科学版),2016,17(3):6-9,15.
[20]王海涛,张远芳,成峰,等.冻融循环作用下盐渍土抗剪强度变化规律研究[J].地下空间与工程学报,2016,12(5):1 271-1 276.
[21]王宁,王清,霍珍生,等.盐分与压实度对盐渍土起始冻胀含水率的影响[J].工程地质学报,2016,24(5):951-958.
[22]马敏,邴慧,李国玉.硫酸钠盐渍土未冻水含量的实验研究[J].冰川冻土,2016,38(4):963-969.
[23]任秀玲,张文,刘昕,等.西北地区盐渍土盐胀特性研究进展与思考[J].土壤通报,2016,47(1):246-252.
[2]付江涛,栗岳洲,胡夏嵩,等.含盐量对亚硫酸盐渍土抗剪强度影响的试验[J].农业工程学报,2016,32(6):155-161.
[3]张洋,李素艳,孙向阳,等.不同改良剂对滨海盐渍土的改良效果[J].灌溉排水学报,2016,35(5):67-73.
[4]李英涛,袁露.水泥改良盐渍土强度形成机理微观研究[J].公路,2013(1):164-168.
[5]于新,孙强.水泥石灰改良氯盐渍土强度特性试验研究[J].华东交通大学学报,2011,28(5):29-34.
[6]李宏波,沈晖,沈杰.粉煤灰固化超盐渍土的抗剪强度及耐久性[J].兰州理工大学学报,2015,41(3):140-144.
[7]贺生云,李宏波,吴振华,等.粉煤灰-镁渣改良超盐渍土的工程性质研究[J].科学技术与工程,2015,15(22):176-180.
[8]李宏波,田军仓,何芳,等.水泥粉煤灰固化超盐渍土的力学性能试验研究[J].广西大学学报(自然科学版),2014,39(4):809-816.
[9]李宏波,田军仓,边兴.掺加硅灰和石灰条件下的超盐渍土抗剪特征研究[J].广西大学学报(自然科学版),2016,41(4):1 145-1 152.
[10]李宏波,田军仓,陈文兵,等.水泥硅灰固化超盐渍土的抗剪强度试验[J].桂林理工大学学报,2015,35(3):508-513.
[11]李敏,柴寿喜,魏丽.麦秸秆的力学性能及加筋滨海盐渍土的抗压强度研究[J].工程地质学报,2009,17(4):545-549.
[12]杨继位,柴寿喜,王晓燕,等.以抗压强度确定麦秸秆加筋盐渍土的加筋条件[J].岩土力学,2010,31(10):3 260-3 264.
[13]郭相平,杨泊,王振昌,等.秸秆隔层对滨海盐渍土水盐运移影响[J].灌溉排水学报,2016,35(5):22-27.
[14]吕擎峰,申贝,王生新,等.水玻璃固化硫酸盐渍土强度特性及固化机制研究[J].岩土力学,2016,37(3):687-693,727.
[15]杨晓华,王永威,张莎莎.基于调节因素的盐渍土盐胀率随含水率变化规律研究[J].中国公路学报,2016,29(10):12-19.
[16]万旭升,廖孟柯,杜立群.温度对硫酸钠盐渍土盐胀影响的试验研究[J].公路交通科技,2016,33(8):44-50.
[17]岳浩淼,黄建明,文桃,等.换填覆重法处理砂类硫酸盐渍土地基的室内模拟试验[J].岩土力学,2017,38(2):471-478.
[18]方秋阳,柴寿喜,李敏,等.冻融循环对固化盐渍土的抗压强度与变形的影响[J].岩石力学与工程学报,2016,35(5):1 041-1 047.
[19]王文华,万健.冻融循环作用对碳酸盐渍土单轴抗压强度影响的试验研究[J].长春工程学院学报(自然科学版),2016,17(3):6-9,15.
[20]王海涛,张远芳,成峰,等.冻融循环作用下盐渍土抗剪强度变化规律研究[J].地下空间与工程学报,2016,12(5):1 271-1 276.
[21]王宁,王清,霍珍生,等.盐分与压实度对盐渍土起始冻胀含水率的影响[J].工程地质学报,2016,24(5):951-958.
[22]马敏,邴慧,李国玉.硫酸钠盐渍土未冻水含量的实验研究[J].冰川冻土,2016,38(4):963-969.
[23]任秀玲,张文,刘昕,等.西北地区盐渍土盐胀特性研究进展与思考[J].土壤通报,2016,47(1):246-252.