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S-l model of horizontal jet grouting reinforcement for soft soil

机译：软土地基水平旋喷灌浆加固的S-l模型

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摘要

A superposition-iteration (S-I) model is proposed to simulate the jet grouting pre-reinforcing impact for a shallow-buried tunnel. The common model is deduced by theoretical (force equilibrium) analysis and then transformed into the numerical formulation. After applying it to an actual engineering problem, the most obvious deficiency was found to be continuous error accumulation, even when the parameters change slightly In order to address this problem, a superposition-iteration model is developed based on the basic assumption and superposition theory. First, the additional deflection between two successive excavation steps is determined. This is caused by the disappearance of the supporting force in the excavated zone and the soil pressure in the disturbed zone. Consequently, the final deflection can be obtained by repeatedly superposing the additional deflection to the initial deflection in the previous steps. The analytical solution is then determined with the boundary conditions. The superposition-iteration model is thus established. This model was then applied and found to be suitable for real-life engineering applications. During the calculation, the error induced by the ill-conditioned problem of the matrix is easily addressed. The precision of this model is greater compared to previous models. The sensitivity factors and their impact are determined through this superposition-iteration model.
机译：提出了一种叠加-迭代（S-I）模型来模拟浅埋隧道射流注浆的预加固效果。通过理论（力平衡）分析推导通用模型，然后将其转换为数值公式。将其应用于实际工程问题后，即使参数略有变化，也发现最明显的缺陷是连续误差累积。为解决此问题，基于基本假设和叠加理论开发了叠加迭代模型。首先，确定两个连续挖掘步骤之间的附加偏转。这是由于开挖区的支撑力消失和扰动区的土壤压力引起的。因此，可以通过在先前步骤中将附加偏转重复叠加到初始偏转来获得最终偏转。然后根据边界条件确定分析溶液。这样就建立了叠加-迭代模型。然后应用此模型，发现该模型适用于现实生活中的工程应用。在计算过程中，矩阵的病态问题引起的误差很容易解决。与以前的模型相比，此模型的精度更高。敏感性因素及其影响是通过此叠加迭代模型确定的。

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