覆土球罐土压力计算方法研究  

Investigation on calculation method of soil pressure on mounded spherical tanks

作　　者：张浩然 陈振恒 张骞 王泽武[1] ZHANG Haoran;CHEN Zhenheng;ZHANG Qian;WANG Zewu(Department of Chemical Machinery and Safety,Dalian University of Technology,Dalian 116024,China;Shandong Chambroad Holding Group Co.,Ltd.,Binzhou 256500,China)

机构地区：[1]大连理工大学化工机械与安全系,辽宁大连116024 [2]山东京博控股集团有限公司,山东滨州256500

出　　处：《压力容器》2024年第9期31-38,共8页Pressure Vessel Technology

摘　　要：由于受土层的覆盖,覆土球罐受力环境变得复杂,针对覆土球罐非均匀土压力计算不准确的问题,对现有的覆土储罐土压力计算方法进行了分析,并基于Ansys有限元软件提出了一种覆土球罐土压力数值计算方法,再通过对覆土球罐试验测试,验证了数值模型的可靠性。以某1000 m^(3)覆土球罐为例,建立了罐-土耦合模型,分析了覆土深度20 m内非均匀土压力分布规律,确定了覆土球罐底部压力最大、赤道部位压力最小。同时,针对覆土深度和球罐半径2个主要影响因素,进行了大量数值计算和对比分析,发现现有的方法计算结果小于实际值高达43%,偏危险。为此提出了一种新的土压力工程计算公式,计算结果高于实际值10%左右,偏安全。综合考虑计算结果和实际应用情况,该公式适用于直径小于20 m、覆土深度40 m以下的球罐土压力的计算。该研究可为覆土球罐工程设计中的最大土压力计算提供参考。Due to the coverage of soil layer,the working environment of mounded spherical tanks becomes complex.To address the issue of inaccurate calculations of uneven soil pressure on mounded spherical tanks,the existing calculation methods of soil pressure for the mounded tank were reviewed,and a numerical calculation method for calculating the soil pressure on mounded spherical tank was established using Ansys software.Additionally,an experimental bench of the mounded spherical tank was built to verify the reliability of the numerical model.Subsequently,a tank-soil coupling model was established for a 1000 m^(3)mounded spherical tank,and the distribution patterns of uneven soil pressure within 20 m depth was analyzed in detail,which shows that the maximum pressure occurs at the bottom of the mounded spherical tank,while the minimum pressure occurs at the equator.Finally,the two main factors,the mounded depth and radius of tank were further discussed based on a large number of sample calculations.It is found that the calculated result of the existing method is 43%lower than the actual value,which is dangerous.A new formula for calculating soil pressure was proposed,and the calculated result is about 10%higher than the actual value,which is considered safe.By comprehensively considering the calculation results and practical application,the formulas are applicable for calculating the soil pressure of spherical tanks with a diameter less than 20 m and a soil cover depth below 40 m.This study can provide a reference for calculating the maximum soil pressure in the engineering design of mounded spherical tank.

关 键 词：覆土球罐 非均匀土压力 罐-土耦合 工程公式 

分 类 号：TH49[机械工程—机械制造及自动化] TE972[石油与天然气工程—石油机械设备] TH123