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| 地震波作用下埋地PE管道力学响应特性研究 |
| Mechanical response of buried PE pipe under seismic wave |
| 投稿时间：2021-10-07 修订日期：2021-12-06 |
| DOI： |
| 中文关键词: PE管 地震波 数值仿真 力学响应 环向应力 |
| 英文关键词:PE pipe seismic wave numerical simulation mechanical response hoop stress |
| 基金项目:国家自然科学基金(52104223)；中国博士后科学基金(2019M653839XB),四川省博士后特别资助 |
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| 中文摘要: |
| PE管由于其抗冲击、抗开裂、耐老化、耐腐蚀等优点,被广泛应用于城镇燃气、供水、浆体等输送领域。地震是造成埋地管道失效的主要因素之一,特别是地震波作用下埋地管道受力更复杂。为此,利用粘弹性人工边界,采用Mohr-Coulomb模型考虑土体非线性,建立了埋地PE管-土耦合数值模型,研究地震波作用下埋地PE管力学特性,探究管道内压、地震烈度、围土类型、覆土高度以及管道参数对其力学响应的影响。结果表明：地震波作用下管壁应力在初始应力附近波动,管道截面圆周41°、131°、221°及311°方向为应力极大值部位,应力分布具有对称性；内压增加了管壁初始应力,地震波进一步增大了压力管道应力；地震烈度越大,管道环向应力幅值越大,应力极值部位越偏离竖直与水平方向；相同地震烈度下,土体弹性模量越小,管道应力越大；砂土中管道与浅埋管道应力更小；管径越大,最大应变越大。研究结果可为PE管道敷设、安全评价等提供理论依据。 |
| 英文摘要: |
| PE pipes are widely used in transportation fields such as urban gas, water supply, slurry, etc. due to their advantages of impact resistance, crack resistance, aging resistance, corrosion resistance, etc. Earthquake is one of the main factors causing the failure of buried pipes, especially the mechanics of buried pipes are more complicated under the action of seismic waves. Therefore, we used the viscoelastic artificial boundary, adopted the Mohr-Coulomb model to consider the nonlinearity of the soil, and finally established a numerical model of the buried PE pipe-soil coupling. We studied the mechanical characteristics of the buried PE pipe under the action of seismic waves and discussed the effects of pipe internal pressure, seismic intensity, surrounding soil types, covering soil height and pipe specifications on its mechanical responses. The results show that the stress on the pipe wall fluctuates around the initial stress under the action of seismic waves. On the circumference of the pipe section, the maximum stress occurs in the 41°, 131°, 221° and 311° directions, and the stress distribution is symmetrical. The internal pressure increases the initial stress of the pipe wall, and the seismic wave causes the pipe stress to increase further. The greater the seismic intensity, the greater the hoop stress, and the position of stress extremes deviates from the vertical and horizontal directions further. Under the same seismic intensity, the smaller the soil elastic modulus, the greater the pipe stress. Pipes in sand and shallow buried pipes are with smaller stress. The larger the pipe diameter is, the larger the maximum strain is. The research results can provide theoretical bases for the laying of PE pipes and their safety evaluation. |
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