基于PFC2D的岩溶土洞对输电杆塔基础稳定性影响分析  

Analysis of the Influence of Karst Soil Caves on the Stability of Transmission Tower Foundations Based on PFC2D

作　　者：罗易 吴军杰 王伟 高磊[2] LUO Yi;WU Junjie;WANG Wei;GAO Lei(Central Southern China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Wuhan 430071,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024

出　　处：《电力勘测设计》2024年第S02期78-84,共7页Electric Power Survey & Design

摘　　要：岩溶土洞是岩溶区域常见的隐伏不良地质条件,随着我国经济发展对电力需求的不断增加,输电工程建设越来越多,由于输电线路的特殊性,在选址时常会跨越岩溶地区,若设计施工不当,则导致输电杆塔基础产生不均匀沉降、变形以及地基整体破坏,严重威胁输电杆塔线路的安全运行。依托宁夏—湖南±800 kV特高压直流输电工程,采用离散元PFC2D软件,分析岩溶土洞对输电杆塔基础稳定的影响,研究洞体尺寸、埋深以及洞体水平位置等因素的影响;并结合数值模拟结果,对洞体安全位置影响范围进行探讨,得到洞体安全位置预测模型,该模型可用于判定场地岩溶土洞地质条件下输电杆塔地基的安全稳定。Karst soil caves are common hidden unfavorable geological conditions in karst areas.With the increasing demand for electricity in China's economic development,there are more and more transmission engineering constructions.Due to the unique nature of transmission lines,it is inevitable to cross karst areas when selecting a site.Improper design and construction can lead to uneven settlement,deformation,and overall damage to the foundation of transmission towers,posing a serious threat to the safe operation of transmission tower lines.Relying on the Ningxia-Hunan±800kV UHVDC transmission project,uses the discrete element PFC2D software to analyze the impact of karst soil caves on the stability of transmission tower foundation,and studies the impact of cave size,burial depth and horizontal position of the cave.Based on the numerical simulation results,the influence range of the safe position of the tunnel was explored,and a prediction model for the safe position of the tunnel was obtained.This model can be used as a reference to determine the safety and stability of the transmission tower foundation under the geological conditions of karst soil caves in the site.

关 键 词：岩溶土洞 输电线路杆塔 基础稳定性 离散元 预测模型 

分 类 号：TK01[动力工程及工程热物理] P642[天文地球—工程地质学]