板墙组合式软土固化地基沉降特性与设计参数优化  

Settlement Characteristics and Design Parameters Optimization of Composite Panel-Wall Solidified Soft Soil Foundations

作　　者：朱敏捷 蔡勇 周晋杭 李建华 于洋[3] ZHU Minjie;CAI Yong;ZHOU Jinhang;LI Jianhua;YU Yang(State Grid Zhejiang Electric Power Co.,Ltd.,Taizhou Power Supply Company,Taizhou 318000,China;State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310000,China;Ocean College,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]国网浙江省电力有限公司台州供电公司,浙江台州318000 [2]国网浙江省电力有限公司,浙江杭州310000 [3]浙江大学海洋学院,浙江舟山316021

出　　处：《防灾减灾工程学报》2024年第5期1149-1157,1230,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家电网依托工程科技项目(11CJ01);浙江省自然科学基金项目(LY21D020001)资助。

摘　　要：软土固化是近年来开始广泛使用的地基处理方法之一,如何综合考虑安全性和工程造价,实现固化土地基的优化设计是工程中普遍关注的问题。本研究以浙江省台州市经纬110 kV滨海变电站场地为研究对象,提出适用于变电站场地荷载特性的板墙组合式固化地基处理方式,通过现场勘察与室内实验,测定典型软土和固化土物理力学参数,建立场地三维数值模型,计算不同板墙组合方案对应的工后沉降与孔隙水压力变化规律,分析板墙组合式固化地基处理方式在控制沉降方面的优势。在分析地基沉降演变过程基础上,以控制地基沉降和固化成本为优化目标,确定板墙组合式固化地基的最优设计参数为固化剂掺量4.5%,固化板厚度3.0 m,固化墙厚度2.0 m、深度7.0 m。研究发现固化剂掺量的增加,显著增加了固化土单轴抗压强度与抗剪强度,但最大沉降值几乎不受固化剂掺量影响。固化墙通过限制下伏软土的侧向变形,减小了超静孔隙水压力消散速率和地基工后沉降变形速率。Soft soil solidification has become a widely used foundation treatment method in recent years.A key engineering challenge is how to optimize the design of solidified soil foundation by balancing safety and project cost.This study focused on the site of the Jingwei 110 kV Binhai Substation in Taizhou,Zhejiang Province,and proposed a panel-wall composite solidified foundation treatment method suitable for the load characteristics of the site.Through field investigation and laboratory experiments,the physical and mechanical parameters of typical soft soil and solidified soil were measured.A three-dimensional numerical model of the site was then established to calculate the variation patterns of post-construction settlement and pore water pressure under different panel-wall combinations.The advantages of the panel-wall composite solidification method in controlling settlement were also analyzed.Based on an analysis of the settlement evolution process,the optimal design parameters for panel-wall composite solidified foundation were determined,with the curing agent content at 4.5%,panel thickness at 3.0 m,wall thickness at 2.0 m,and wall depth at 7.0 m.The study found that increasing the curing agent content significantly enhanced the uniaxial compressive strength and shear strength of the solidified soil,but the maximum settlement was hardly affected by the agent content.The solidified wall limited the lateral deformation of the underlying soft soil,reducing the dissipation rate of excess pore water pressure and the post-construction settlement rate of the foundation.

关 键 词：软土地基 固化土 变电站 数值模拟 优化 

分 类 号：TU447[建筑科学—岩土工程]