Some Remarks on Practical Aspects of Laboratory Testing of Deep Soil Mixing Composites Achieved in Organic Soils

机译：关于有机土壤中达到深土混合复合材料实验室检测实践方面的几点备注

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This paper presents the results of laboratory testing of organic soil-cement samples are presented in the paper. The research program continues previously reported the authors' experiences with cement-fly ash-soil sample testing. Over 100 of compression and a dozen of tension tests have been carried out altogether. Several samples were waiting for failure test for over one year after they were formed. Several factors, like: the large amount of the tested samples, a long observation time, carrying out the tests in complex cycles of loading and the possibility of registering the loads and deformation in the axial and lateral direction - have made it possible to take into consideration numerous interdependencies, three of which have been presented in this work: the increments of compression strength, the stiffness of soil-cement in relation to strength and the tensile strength. Compressive strength, elastic modulus and tensile resistance of cubic samples were examined. Samples were mixed and stored in the laboratory conditions. Further numerical analysis in the Finite Element Method numerical code Z_Soil, were performed on the basis of laboratory test results. Computations prove that cement-based stabilization of organic soil brings serious risks (in terms of material capacity and stiffness) and Deep Soil Mixing technology should not be recommended for achieving it. The numerical analysis presented in the study below includes only one type of organic and sandy soil and several possible geometric combinations. Despite that, it clearly points to the fact that designing the DSM columns in the organic soil may be linked with a considerable risk and the settlement may reach too high values. During in situ mixing, the organic material surrounded by sand layers surely mixes with one another in certain areas. However, it has not been examined and it is difficult to assume such mixing already at the designing stage. In case of designing the DSM columns which goes through a thin layer of organic soil it is recommended to carry out each time the core drilling which checks the degree of material mixing and their strength.

机译：本文介绍了有机土水泥样品的实验室检测结果。研究计划仍在继续报道了作者对水泥 - 飞灰土样试验的经验。已经完全进行了100多个压缩和十几次的张力测试。在形成后，几个样本正在等待失败测试。类似的因素，如：大量的测试样品，长观察时间，在复杂的装载周期中进行测试和在轴向和横向方向上注册负载和变形的可能性 - 使得可以进入考虑到许多相互依赖性，其中三个已经介绍了这项工作：压缩强度的增量，与强度和拉伸强度相比的土壤水泥刚度。检查了立方样品的抗压强度，弹性模量和拉伸抗性。将样品混合并储存在实验室条件下。在有限元方法数值码Z_SoIL的进一步数值分析是基于实验室测试结果进行的。计算证明，基于水泥的稳定性有机土壤带来严重的风险（就物质容量和刚度而言），不应建议深土混合技术来实现它。下面研究中提出的数值分析仅包括一种类型的有机和砂土和几种可能的几何组合。尽管如此，它显然指出了设计有机土壤中的DSM柱可能与相当大的风险联系，并且沉降可能达到太高的值。在原位混合期间，由砂层包围的有机材料在某些区域中彼此相对混合。然而，它尚未被检查，并且很难在设计阶段假设这种混合。在设计通过一层有机土层的DSM柱的情况下，建议每次检查材料混合程度的核心钻孔及其强度。

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《World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium》|2017年|789 p.|共10页
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Piotr Kanty; Jaroslaw Rybak; Damian Stefaniuk;
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中图分类工程材料学;
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4. Some Remarks on Practical Aspects of Laboratory Testing of Deep Soil Mixing Composites Achieved in Organic Soils [C] . Piotr Kanty, Jaroslaw Rybak, Damian Stefaniuk World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium . 2017

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5. Deep mixing technology for mitigation of swell-shrink behavior of expansive soils of moderate to deep active depths. [D] . Madhyannapu, Raja Sekhar. 2007

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6. The temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation [O] . Dong Yan, Jinquan Li, Junmin Pei, -1

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Some Remarks on Practical Aspects of Laboratory Testing of Deep Soil Mixing Composites Achieved in Organic Soils

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