Performance Study of Buried Pipelines under Static Loads

Abstract

The possibility of servicing lifelines such as highways, railways, pipelines, and tunnels is of great social importance. The characteristic that separates the buried pipeline from other structures is that its dimensions are very long compared to its other dimensions. Ground vibrations caused by earthquakes, construction activities, traffic, explosions, and machinery can damage these structures. Lifeline integrity can be compromised in two ways: (1) direct damage due to excessive dynamic loading of the lifeline, and (2) indirect damage due to soil failures such as liquefaction, slope instability, and differential settlements. 3D printing (also known as additive manufacturing) is an advanced manufacturing process that can automatically produce complex geometric shapes from a 3D computer-aided design model without tools, molds, or fixtures. This automated manufacturing process has been applied in diverse industries today because it can revolutionize the construction industry with expected benefits. This research study on the performance of buried pipelines under static loads to the structure's safety against the possible development of progressive failure. This research study includes a numerical study, where it was studied many parameters to value the performance of the pipeline. The parameters are (a) the material of the pipeline (steel, traditional concrete, and 3D concrete printed), (b) the thickness of the pipeline (20, 30, and 40 mm), and (c) soil type (moist sandy soil, saturated sandy soil, moist cohesive soil, and saturated cohesive soil). Different results were obtained depending on the type of soil where all pipelines materials' behavior was similar in the case of moist soil. Doi: 10.28991/CEJ-2022-08-01-01 Full Text: PDF

Effects of Laying Depth and Pipe Arc Length on the Mechanical Performance of Large-Diameter Cold-Water Pipes during Float-and-Sink Installation

“…where O(ε 3/2 ) is the higher-order correction term. Substituting Equation (17) into Equation (10), the 0th order approximation is obtained as:…”

“…Zarastvand et al [16] investigated the acoustic performance of the stiffened doubly curved shells based on a genetic algorithm. Alanazi et al [17] studied buried pipelines under static loads using finite element analysis. The authors simulated different types of pipelines (steel, concrete, and 3D-printed concrete) with different thicknesses and soil conditions (sandy and cohesive, moist, and saturated).…”

Analysis of the Buried Pipeline Response Induced by Twin Tunneling Using the Generalized Hermite Spectral Method

“…In urban areas, buried pipelines are commonly utilized to transport water, sewage, oil, natural gas and other materials, and they play extremely important roles in the sustainability of economic, ecological and social development. Because of space limitations, most buried pipelines are often constructed in a complex environment, and they are vulnerable to surface loading, foundation-pit excavation and tunnel excavations [1][2][3][4][5]. With the rapid growth of underground transportation systems in big cities, more and more tunnels have been excavated beneath buried pipelines in the past few decades.…”

“…Moreover, these two kinds of methods are only workable for a finite long pipeline that is artificially truncated with fictitious boundary conditions. In fact, the buried pipeline is commonly much longer than the acting region of additional stress arising from undercrossing tunneling; thus, it seems to be more reasonable to take the pipeline as infinite long for developing a solution to assess its response [1]. Different from the analytical method and finite difference method, the generalized Hermite spectral method formulates a solution of the differential equation using a truncated series of Hermite functions, which are mutually orthogonal and workable in an unbounded domain; thus, it can be available for estimating the buried pipeline response in the whole region.…”