Stability Analysis And Experimental Study Of Hole Wall In Soil Horizontal Drilling

With the promotion of urban environmental protection, greenengineering greatly favored. non-excavation directional controldrilling technology have significant characteristic that withoutundermining the urban road, does not affect normal traffic, noisesmall, underground pipeline laying works in the city becomeincreasingly important. However, with the increasing complexityof urban underground pipelines, construction environment hasbecome increasingly complex. due to soil deformation ,the projectcould easily trigger accidents. The analysis of stress anddisplacement in Process of drilling, could study the deformationand stress nearby hole wall soil body, benefit to monitor soil bodysurface deformation, to avoid the destruction of undergroundstructures. Thereby reducing the difficulty of construction,speed up the construction progress, reducing project costs andengineering accidents and improve the quality of the projects.Hole wall stability of soil body level drilling is a key ofdrilling formation. its influential and subjective factors can besummarized into geological conditions and drilling operations.Hole wall stability of soil body level drilling was alwaysconcerned about important issues. instability of Hole wall willtrigger a serious impetus to the surrounding environment. Thispaper focuses on research the influence of stability of hole wallsurrounding soil body when change of stress and strain of Hole wallnear soil. Design modelling experiment study the distribution anddevelopment of physical stress , analysis Hole wall stableconditions and factors, it can provide more reliable basis todesign and construction to the horizontal drilling for soilphysical.The paper is divided into six sections.The first section is prolegomenon:Introduced a non-excavationworks and the level of technological development. research instability of hole wall of horizontal drilling, meaning that thelevel of research and dynamic stability, and introduced thispaper's study conditions and technical routes.The second section is introduction of technology of thehorizontal directional drilling: systematically introduced intonon-excavation equipment and construction techniques.The third section is analysis of stability factors into holewall stability: expounded the hazards of instability of hole wall.introduced hole wall stability geological factors, and factors ofcleaning fluid and drilling's technique influence to hole wallstability.The forth section is mechanics analysis of hole wall stability:This is theory analysis of hole wall and the surroundingterritories body stability, derived mechanics formula aboutelastic model and elastoplastic modulus of hole wall soil physical.identified Hole wall plasticity impact area, and Hole wallstability of the impact of cleaning fluid seeps the calculatingformula.The fifth section is Hole wall stability factors sensitivityanalysis: This test method used orthogonal establish Hole wallstability calculation models.Hole wall stabilizing effectparameters established cohesion,angle of internal friction,unitweight,lateral pressure coefficient and hole depth.Throughstatistical analysis of the probability of impact identified Holewall stability for the most sensitive parameters such hole depthand lateral pressure coefficient useful conclusions.The sixth section is Hole wall stability models for testing:This chapter introduced the self-regulating resistance-type testpanels and theory formula. Applications similar principles,theinterior design of small modeling,data analysis contra-computedthe actual level of stress and displacement changes of Hole wallsoli physical. Test methods and processes for further relatedresearch provides a useful reference.