| With the progress of high-tech and urbanization, underground pipes play moreand more important role in urban infrastructure. The existing tunnelling machines aresuitable for the specific geological conditions, and it’s working mechanism generallyidentify the soil as source of resistance, but rarely consider the positive effect ofsoil.Based on propeller’s motivation theory which provide power by means of gas orliquid media, the article has reached preliminary analysis and study of the positiveeffect of soil on the tunneling machine.The dissertation takes the interaction between the screw rods which are thedriving part of Spiral-drive advancing machine and soil in the process of drivingprocess in silty clay as research background, and studies the influence of screw rodstructure parameters to provided tension by means of laboratory model test andtheoretical analysis. the main contents are as follows.(1) Summarizes various theories of tunnel boring machines jackingforce,meanwhile reference to the relevant soil-machine systems theoreticalresearch achievement and methods，Study the screw rod structure parameterof and soil property as a system;(2) Basis on the similar theory deduces similarity criterion of model test, andfocus on the similarity criterions of screw rod structure parameters;(3) Set up the project of model test, complete the design of the model testplatform, screw rod and measurement system,and arrange model test by theorthogonal test；There are several conclusions obtained from the researches as following:(1) The affect factors order is thread angle>the thread root distance>tooth depth;(2) Conclude a group optimal structural features factors combination;(3) Using regression analysis to obtain regression equations between tension andscrew rod structure parameters;(4) The surface deformation law during the precess of screw rod precession;(5) Research the rule of influence of change of soil moisture content on thetension when choose the optimal combination of factors level. |
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