Hydraulic dissolution of soil

土壤的水力溶解是许多程序和方法的关键。一个常见的例子是喷射灌浆法，它使用高压气流来破碎和加固土壤。它可以广泛应用于各种问题和施工中。然而，仍然有一些挑战需要应对，主要是考虑到水射流对土壤的影响以及它的扩张。后者取决于许多因素，包括工艺和施工参数以及土体的性质。本研究的主要目的是通过计算机模拟的方法，即在施工前，用流体射流模拟土壤的溶解过程，并确定影响射流在土壤中膨胀的因素。模拟采用了光滑粒子流体动力学(SPH)的框架。这是一种无网格粒子方法，不仅是近几十年来建立的用于物理和流体动力学模拟的方法，而且在处理土壤行为方面也被证明具有巨大的潜力。因此，SPH已成功地应用于流体力学和固体力学中的各种问题。最近的研究结果表明，该方法非常适合于岩土现象的模拟。为了这个项目的目的，在考虑土-流体相互作用的喷射灌浆、海底电缆敷设和其他土工过程的模拟之后，将在SPH中实施土的本构方程和屈服准则，并使用试验数据进行验证。研究结果可为水射流膨胀及其与土体和施工性质的关系提供信息，也可为土工方法的经济可行性和质量控制提供参考。

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.