Hydraulic dissolution of soil

土壤的水力溶解对许多程序和方法至关重要。一个常见的例子是喷射灌浆方法，它使用高压流来破碎和胶结土壤。它可以应用于广泛的问题和建设。然而，仍然有一些挑战需要满足，主要考虑到水射流对土壤的影响，以及其膨胀。后者取决于许多因素，包括工艺和施工参数以及土壤的性质。本研究的主要目的是利用流体射流来表示土壤溶解过程，并通过计算机模拟来确定影响射流在土壤中膨胀的因素，即在施工之前。模拟采用光滑粒子流体动力学（SPH）的框架。这是一种无网格颗粒方法，不仅在过去几十年中建立了物理和流体动力学建模，而且已被证明在处理土壤行为方面具有很大的潜力。因此，SPH已成功地应用于流体和固体力学中的大量问题。最近的研究结果表明，该方法是非常适合的岩土工程现象的建模。为了本项目的目的，在考虑土壤-流体相互作用的喷射灌浆、海底电缆安装和其他岩土工程过程的模拟之后，将在SPH中实施土壤的本构方程和屈服准则，并使用实验数据进行验证。结果应该提供有关喷射膨胀及其与土壤和施工性质的关系的信息，也有助于经济可行性和质量控制的岩土方法。

The hydraulic dissolution of soil is crucial to a number of procedures and methods.A common example is the method of jet grouting, which uses high pressure streams to break up and cement the soil. It can be applied to a wide range of problems and construction. However, there are still some challenges to be met, manly considering the impact of the water jet on the soil, as well as its expansion. The later depends on many factors, including process and construction parameters as well as the properties of soil. The main objective of this study is to represent process of soil dissolution using a fluid jet and determine the factors of impact on the jet expansion in the soil by the means of computer simulation, i.e. prior to construction. The simulations employ the framework of the smoothed particle hydrodynamics (SPH). This is a meshless particle method that has not only been established in the last few decades for physical and hydrodynamic modeling but has also proven to have a great potential in handling soil behavior. SPH has therefore been successfully applied to a vast range of problems in both fluid and solid mechanics. Recent research results suggest that the method is quite suitable for the modeling of geotechnical phenomena. For the purpose of this project a constitutive equation and a yield criterion for soil are to be implemented in the SPH and also validated using experimental data, following the simulation of a jet grouting, subsea cable installation and other geotechnical processes considering soil-fluid interaction. The results are supposed to provide information about the jet expansion and its relation to the soil and construction properties and also contribute to the economic feasibility and quality control of the geotechnical methods.