| Civil and Traffic Engineering |
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| Experimental study on unsaturated permeability characteristics of solidified sediment stabilized with cement |
| ZOU Wei-lie1,2, HE Yang1, ZHANG Feng-De3, WANG Dong-xing1, WANG Shuai4, WANG Yuan-ming3 |
1. School of Civil Engineering, Wuhan University, Wuhan 430072, China;
2. School of Civil Engineering, Xijing University, Xi'an 710123, China;
3. Sanjiang Engineering Construction Administration Bureau of Heilongjiang, Harbin 150006, China;
4. Anhui Construction Engineering Group Oversea Limited Company, Hefei 230000, China |
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Abstract The unsaturated permeability properties of subgrade soils have an important influence n the strength and deformation behavior of subgrade soils. Based on the variable head method, The influences of compaction degree, cement amount and curing time on the unsaturated permeability coefficient of solidified sediment modified with cement. By using the transient release and imbibition method(TRIM)system manufactured in USA, the unsaturated permeability tests under drying and wetting paths were conducted in order to obtain the hydraulic parameters, which are usually difficult to measure., with analyzed the influences of compaction, cement amount and curing time for unsaturated permeability coefficient of modified soil. Based on the existing unsaturated permeability coefficient model, A novel unsaturated permeability coefficient prediction model was proposed by the influences of cement amount, compaction degree and saturation degree. The validation of the proposed model was confirmed. Results show that the permeability of the solidified soil is poor, and it is inversely proportional to the curing age, cement content and degree of compaction. In the drying and wetting stage, the curing age has slight influence on the unsaturated permeability coefficient of modified silt soil, and the unsaturated permeability coefficient decreases as the degree of compaction increases.
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Received: 20 November 2016
Published: 13 November 2017
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改性淤泥固化土非饱和渗透特性试验研究
针对路基土的非饱和渗透特性对路基土强度和变形特性有着很大影响的问题，采用变水头方法，量测不同压实度、水泥掺量和养护龄期下改性淤泥固化土的饱和渗透系数.利用瞬态脱吸湿法（TRIM）系统对改性淤泥固化土样进行脱、吸湿试验，采用TRIM系统的软件进行反算，获得难以实际测量的水力学参数，得到改性淤泥固化土的渗透函数曲线.重点分析压实度、水泥掺量和养护龄期等因素对改性淤泥固化土非饱和渗透系数的影响.基于现有非饱和渗透系数模型，提出能够反映水泥掺量、压实度及饱和度等影响的改性淤泥固化土非饱和渗透系数预测模型，对模型有效性进行验证.结果表明，固化土渗透性较差，与养护龄期、水泥掺量和压实度成反比.脱、吸湿阶段，养护龄期对改性淤泥固化土非饱和渗透系数影响不大，改性淤泥固化土非饱和渗透系数随压实度增大而减小.
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