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Tests on mechanical behavior of unsaturated decomposed granite and its modelling considering finite deformation

机译：不饱和分解花岗岩的力学行为试验及考虑有限变形的建模

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Generally speaking, most of the geomaterials in the surface ground are in an unsaturated state. The mechanical and hydraulic properties of unsaturated soil are much more complicated than those of saturated soil. To rationally describe these properties, it is important to couple the stress-strain relation of the unsaturated soil with its water retention characteristics using rational state variables. In this paper, oedometer and triaxial compression tests on decomposed granite under constant-suction and constant degree of saturation conditions were conducted. Based on the test results, a modified constitutive model was proposed to build an incremental relation between the degree of saturation and suction that considers the influence of finite deformation. The modified model was utilized to simulate the corresponding laboratory tests. It is found that the modified constitutive model has satisfactory accuracy to describe the mechanical and hydraulic properties of unsaturated decomposed granite, which verified the reasonability of the assumption adopted in this paper. The test results are also helpful for the understanding of the moisture characteristics of the decomposed granite under constant degree of saturation condition. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：一般来说，地表中的大多数土工材料处于不饱和状态。非饱和土壤的机械和水力特性比饱和土壤要复杂得多。为了合理地描述这些特性，重要的是使用合理的状态变量将非饱和土的应力-应变关系与其保水特性耦合起来。本文在恒定吸力和恒定饱和度条件下，对分解后的花岗岩进行了里程表和三轴压缩试验。根据测试结果，提出了一种修正的本构模型，以考虑饱和变形的影响建立饱和度和吸力之间的增量关系。修改后的模型用于模拟相应的实验室测试。结果表明，改进的本构模型能够准确地描述非饱和分解花岗岩的力学和水力性质，验证了本文所采用假设的合理性。试验结果也有助于理解在恒定饱和度条件下分解花岗岩的水分特征。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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