| With the development of traffic engineering, more and more high-way and railway tunnels, especially, urban underground engineering, are built. Commonly urban under ground projects are of shallow depth and the stratum condition located is very bad. The application of tunneling method will have a great influence on the stratum, which would result in great ground subsidence. For tunnels being close to or intersecting with important ground structures, underground objects or underground pipes, the allowed ground subsidence during construction is very limited. This contradiction poses a difficult subject to the field of the underground engineering at all times.For having a better research of horizontal whirling jet grouting pre-reinforcement mechanics the article gives the stress and displacement formula of soil in the mechanics of plastic to explain the soil reinforcement essence further contained self-weight field. At the same time, the Duncan-Chang non-linear elasticity constitutive model is adopted and the influence of settlement of ground surface in the process of underground tunnel excavation with two different methods is considered in this paper, the influence of settlement of ground surface in the sand soil area with two different methods of underground tunnel excavation is analyzed by ANSYS finite element software. Some useful conclusions are gained.On the basis of analyzing the reinceforcement mechanics of horizontal whirling jet grouting comprehensively, the influence levels of horizontal whirling jet grouting pre-reinforcement are obtained by means of theoretical analysis, numerical calculation, testing in situ and other ways with tunnel engineering associated. Not only are the displacement changes of soil surface,arch crown and inverted arch analyzed but also the plastic zone and endogen force changes of tunnel are analyzed.Above all, this research has reference value to the Horizontal Whirling Jet Grouting's further applications.
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