An Integrated Approach to Optimal Pipeline Routing, Design, Operation and Maintenance

Taiyuan Underground Pipeline Testing and Analysis of Deformation and Failure

“…The first time taken in the pipe below the height width 20 × 30cm in the 0 ~ 50min , recording and observating the changes in the settlement of the subject as well as the pipeline deformation;When the pipeline deformation stable than expansing the pipe where below the cavity depth to 30cm, and observating the pipeline and the settlement within the underlying change both 50 ~ 150min; After150min, After the settlement mark and pipeline deformation stable than expansing the hole width to 50cmwith height unchanged and record the various experimental data. Figure 3 is the deposition curv of each settling of the pipes and pipeline settlement and failure modes : (1) In the case of the sewer pipe beneath soil width determining, when the expansion of the pore depth, sedimentation subscript remains substantially unchanged, and no significant change in the pipe itself, i.e., the deformation of the pipe in the soil below the width determining the soil belowindependent of the hole depth. The first root of both sides of the sewer soil with the pipeline beneath the soil constantly sinking process, a gradual loss, not binding on the sidewall of the pipeline, the pipeline lateral pressure is zero in this process, so the final pipelineFigure 4 failure pattern occurs.…”

“…The ceaseless progress of science and technology accelerate the development of city construction and expand the construction of city underground pipeline Today, the underground pipes are widely used in urban water supply and drainage systems, heating systems, gas supply system, and underground power embedded communication systems [1].However, due to the additional load of urban groundwater over-exploitation of underground resources, as well as the ground caused by a number of major projects [2], resulting in the foundation soil varying degrees of slow deformation [3] [4], the roads generate Subsidence [5].Degree of these factors in varying degrees, affect the normal use of the urban underground pipeline, resulting in the settlement of the urban underground pipeline sabotage [6], and ground subsidence [7] and collapse prone progressive, irreversible characteristics.These bring serious long-term effectsgive to the normal economic life of the city [8].China has been discovered more than 30 cities which have varying degrees of regional land subsidence and collapse, which belong to one of the more serious of the city in Taiyuan.…”