Research on key construction technologies of vertical shafts for pressure pipelines in the gravel stratum of western regions
In view of the significant difference in cementation degree of Xiyu conglomerate,the physical properties and density test methods are used to obtain the research results that the cementation degree directly affects the mechanical properties and three-phase composition.In order to solve the problem of phasic change of the stress-strain curve of Xiyu conglomerate,the stress loading experiment is used to obtain the research result that the deformation under unidirectional loading significantly decreases with the increase of stress.In view of the orthotropic deformation characteristics of the conglomerate in the western region,the study results of minimum vertical deformation and maximum long-axis de-formation are obtained by means of particle arrangement analysis.Aiming at the construction problem of weakly consolidated Xiyu conglomerate in Kuitun River water diversion project,the multi-layer well wall structure and optimized construction technology have successfully achieved the project objec-tives of safety,high efficiency and low cost,and the construction period has been significantly ad-vanced.
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