Preparation Tests of High Flowing Soil from Subway Residue Soil in Yellow River Flooding Area
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摘要:
利用黄泛区地铁工程废弃土制备不同配比的高流动土，并对其工程特性及应用进行研究，提高工程废弃土的利用率，为实现工程低碳排放具有重要意义.取用郑州地区地铁工程废弃粉黏土、粉砂土作为原料，掺入一定比例的水泥和水，配制了24组不同土类、不同配合比、不同预拌时间等影响的流动土试样.利用流动性试验、泌水试验测试时间对流动土流动特性的影响，推荐了粉黏流动土流动性随时间变化经验公式.通过图像三轴仪，测试了粉黏流动土固化后的无侧限强度及变形特征，分析了不同破坏模式.试验结果表明，粉砂土流动土的流动性强于粉黏流动土，泡沫能增加流动土的流动性.大部分流动土在2小时内流动性能满足工程的要求，当需要增加预拌时间时，需要综合考虑强度和流动性需求.粉黏流动土试样剪切后有剪切破坏、压缩破坏、劈裂破坏等3种破坏模式，其受水泥掺量不同而改变.通过流动损失率、强度、变形等分析了该地区高流动土的工程应用控制指标和对策，对于指导该地区地铁废弃渣土的工程应用提供试验依据.
Abstract:The engineering behaviors of high flowing soil prepared from the subway residue soil were tested in this paper, which may greatly improve the utilized efficiency of the soil. The waste silty clay and silty sand were used in these tests mixing with different proportions of cement and water. Twenty-four groups of mixing soil considering the effect of soil type and mix proportion were prepared for the tests. The tests includes the fluidity measuring tests, bleeding tests and strength tests, which characterize the engineering behavior of these samples. It can be concluded that the low-strength sand soil shows a greater fluidity than that of the silty clay. The adding of foam can also improve its fluidity of the mixing soil. Most of the fluidity parameters prepared mixing soil can meet the engineering requirement within two hours. An empirical formula of fluidity was fitted from the test results of the mixing silty clay soil. The unconfined strength and deformation characteristics of solidified soil samples were also performed by digital image triaxial apparatus. The different failure modes were analyzed by comparing the original and damaged solidified soil samples. It can be concluded that the failure modes were represented by the shear failure, compression failure and splitting failure when the contents of curing agent are 5%, 10%, 15% and 20%, respectively. The flow loss rate, compressive strength and deformation model of the flowing soil were presented, from which the engineering application of preparing high flowing soil were recommended.
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Key words:
- Yellow River flooding area /
- subway residue soil /
- liquidity /
- ready-mixed /
- high flowing soil /
- engineering geology
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图 2 不同流动土的流动性随时间变化拟合曲线
a.粉黏土；b.泡沫轻质粉黏土；c.粉砂土；w/c=5.0
Fig. 2. Fitting curves of fluidity with time for different flowing soils
图 3 粉黏流动土流动性随时间变化拟合曲线
a.w/c=4.5; b.w/c=5.0; c.w/c=5.5; d.w/c=6.0
Fig. 3. Fitting curves of fluidity with time for flowing silty clay
图 4 不同配合比拟合参数变化规律
a.参数a; b.参数b
Fig. 4. Fitting parameters versus mix proportions of samples
图 5 粉黏流动土流动性随时间的损失率
a.w/c=4.5; b.w/c=5.0; c.w/c=5.5; d.w/c=6.0
Fig. 5. Loss rate of fluidity with time for flowing silty clay
图 6 粉黏流动土w/c=6.0试样3 h的泌水率
Fig. 6. 3 h bleeding rate of flowing silty clay samples with w/c=6.0
图 7 固化7 d、28 d试样抗压强度
Fig. 7. Compressive strength of fluid solidified samples for 7 d and 28 d
图 9 预拌流动性粉黏土固化土破坏形态
Fig. 9. Failure modes of ready-mixed fluid solidified silty clay samples
表 1 流动土配合比
Table 1. The mix proportions of flowing soil
试件编号 土类别 水灰比
w/c灰土比(%)
c/s配比质量(取2 kg土计算) 水泥g(mc) 干土g(m0) 土中水含量g(mw1) 需加水g(mw2) 1-1 粉黏土 4.5 5 90 1 796 204 200 1-2 10 180 1 796 204 604 1-3 15 269 1 796 204 1 008 1-4 20 359 1 796 204 1 412 2-1 粉黏土 5 5 90 1 796 204 245 2-2 10 180 1 796 204 694 2-3 15 269 1 796 204 1 143 2-4 20 359 1 796 204 1 592 2-5 粉砂土 5 5 95 1 908 92 385 2-6 10 191 1 908 92 862 2-7 15 286 1 908 92 1 339 2-8 20 382 1 908 92 1 816 2-9 泡沫土(泡沫掺入土质量的2%) 5 5 90 1 796 204 245 2-10 10 180 1 796 204 694 2-11 15 269 1 796 204 1 143 2-12 20 359 1 796 204 1 592 3-1 粉黏土 5.5 5 90 1 796 204 290 3-2 10 180 1 796 204 784 3-3 15 269 1 796 204 1 278 3-4 20 359 1 796 204 1 772 4-1 粉黏土 6 5 90 1 796 204 335 4-2 10 180 1 796 204 874 4-3 15 269 1 796 204 1 412 4-4 20 359 1 796 204 1951 
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