大直径塑料检查井支撑结构设计与力学性能分析（论文）.pdf

·715 · 大直径塑料检查井支撑结构设计与力学性能分析 崔 季 1， 吴张永 1， 杨文勇 1， 卞光明 2， 马自刚 2， 代 龙 2 （1. 昆明理工大学机电工程学院，650500，昆明；2. 云南百川环保科技有限公司，650400，昆明） 摘　要： 针对大直径塑料检查井填埋施工存在的变形、断裂问题，提出井内安装支撑结构的施工方法。 支撑结构能够有效减少填埋后检查井的变形量，支撑结构检查井最大变形量关系为：“王”字形 <鸟笼形 <X 形<三角形 <无支撑结构；填埋下检查井最大变形量为 0.556 mm，“王”字形支撑结构检查井仿真下最 大变形量为 0.062 mm，较无支撑结构检查井最大变形量减小了 88.8 %，且“王”字形支撑结构塑料检查井前 六阶模态频率与沥青路面自振频率均无重叠，不会出现共振现象，说明了该结构的合理性；支撑结构检查井 最大变形量测试试验结果趋势与仿真一致，“王”字形支撑结构检查井试验下最大变形量为 0.098 mm，较 无支撑检查井最大变形量减小了 83.1 %。 关键词：大直径塑料检查井；支撑结构；力学分析；模态分析 中图分类号：TU 992 文献标志码：A 文章编号：1000-4726(2023)06-0715-05 Support Structure deSign and mechanical property analySiS of large diameter plaStic inSpection well CUI Ji 1, WU Zhang-yong 1, YANG Wen-yong 1, BIAN Guang-ming 2, MA Zi-gang 2, DAI Long 2 (1. Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, 650500, Kunming, China; 2. Yunnan Baichuan Environmental Protection Technology Co., Ltd., 650400, Kunming, China) abstract: In view of the deformation and fracture problems existing in the landfill construction of large-diameter plastic inspection wells, the construction method of installing supporting structures in the wells is proposed. The support structure can effectively reduce the deformation of the inspection shaft after landfilling. The maximum deformation relationship of the inspection shaft of the support structure is: "Wang" type < birdcage type < X type < triangle type < unsupported structure; the maximum deformation of the inspection shaft under the landfill is 0.556 mm, and the maximum deformation of the inspection shaft with "Wang" shaped support structure under the simulation is 0.062 mm, which is 88.8% less than the maximum deformation of the inspection shaft without support structure. In addition, the first six modal frequencies of the plastic inspection shaft with "Wang" shaped support structure do not overlap with the natural vibration frequency of asphalt pavement, so there will be no resonance phenomenon, indicating the rationality of the structure; the trend of the test results of the maximum deformation of the support structure manhole is consistent with the simulation. The maximum deformation of the "Wang" shaped support structure manhole under the test is 0.098 mm, which is 83.1% less than the maximum deformation of the unsupported manhole. Keywords: large diameter plastic inspection well; support structure; mechanical analysis; the modal analysis 1 塑料检查井填埋力学计算 塑料检查井埋地后的受力分为径向、轴向荷载， 通过力学计算对其环向压应力与轴向压应力分析。 1.1 塑料检查井环向压应力 埋地后塑料检查井主要承受土壤的挤压作用力和 地下水造成的静液压产生径向荷载，径向荷载过大时 塑料检查井井筒轴向的横截面上有环向压应压力产 生。图 1为塑料检查井所受径向荷载示意。埋地后检 查井井筒的环向压应力可由式（1）~（4）计算。 式中： σ t为塑料检查井井筒环向压应力， MPa； 对塑料检查井施工后，因多种荷载作用而导致变 形、断裂的情况提出一种施工方法：施工前，在检查 井的井内安装支撑结构，以抵御回填土沉降带来的冲 击和挤压作用，待回填土沉降后拆除井内支撑结构， 从而达到所需施工效果的方法；并对填埋下的检查井 进行力学计算，设计了多种井内支撑结构，对支撑结 构检查井进行了强度仿真分析与试验分析。 收稿日期：2023–02–19 作者简介： 崔季（1998—），男，贵州六盘水人，硕士， e-mail： 252939474@qq.com. *1? ? _ Architecture Technology 1\54 思1\ 6 O 2023 ?3 8 Vol.54 No.6 Mar. 2023 ·716 · 塑料检查井 地下 水位 地面 Fep.k F 1ep.k ZW Z2 Z1 图 1 径向荷载示意 tσ = + te t NM AW （1） N t=F rR0 （2） F r=F eq+F W （3） M e=0.02