优化地层界线在提高软基勘察质量中的应用  

Application of Optimizing Stratigraphic Boundary in Improving the Quality of Soft Foundation Exploration

作　　者：彭国喜[1] 蒋良文[1] 范爱民 查俊 PENG Guoxi;JIANG Liangwen;FAN Aimin;ZHA Jun(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China;China Railway Communications Investment Group Co.Ltd,Nanning,Guangxi 530300,China;Guangxi Communications Design Group Co.Ltd,Nanning,Guangxi 530000,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]中铁交通投资集团有限公司,南宁530300 [3]广西交通设计集团有限公司,南宁530000

出　　处：《铁道工程学报》2022年第2期36-40,共5页Journal of Railway Engineering Society

摘　　要：研究目的:软弱地基是南方丘间公路、铁路建设过程中最常见的特殊岩土之一,在施工中,软弱地基若处理不当或处理不彻底,往往导致上部的挡墙、抗滑桩等支挡措施失效,从而影响工程建设进度及后期运营安全,这类丘间软基变更的问题日渐突出。本文先分析丘间软基的类型及其破坏类型,后探讨包括“勘探设备、天气”等导致软基变更等原因,并确立一系列优化软基地层界线的原则。研究结论:(1)根据有机质含量、孔隙比、天然含水率等指标,将丘间软基主要分为季节性软土、淤泥质软土两类;(2)采用“钻探+静探”的综合手段进行勘察,软基的深度应由钻探来确定,而静力触探主要用来确定软基的地基承载力等力学参数;(3)确立了“避免勾画‘透镜体’原则、沟心软基最大化原则、陡坡软基最不利原则”等一系列优化软基地层界线的方法;(4)本文研究对提高南方丘间软基的勘察质量、减少在施工阶段的软基变更具有指导意义。Research purposes:Soft ground is one of the most common special rock and soil in the construction of the hill road and railway construction in south China.In construction,if soft ground is treated improperly or not completely,it often leads to the failure of the upper retaining wall,anti-slide pile and other support measures,which affect project construction schedule and late operation safety,and this problem of soft foundation change between hills is becoming increasingly prominent.This paper first analyzes the types of soft foundation between hills and its damage types,discusses the causes of soft foundation change including"exploration equipment,weather"and so on,and establishes a series of principles to optimize the stratigraphic boundary of soft foundation.Research conclusions:(1)According to the organic matter content,porosity ratio,natural water content and other indexes,the soft foundation between hills can be divided into seasonal soft soil and silty soft soil.(2)The comprehensive means of"drilling+static exploration"is adopted to survey.The depth of soft foundation should be determined by drilling,while static exploration is mainly used to determine the mechanical parameters such as the bearing capacity of soft foundation.(3)A series of methods to optimize the layer boundary of soft base,such as the principle of avoiding drawing′lens′,the principle of maximizing the soft foundation of gully heart,and the principle of the most unfavorable soft foundation of steep slope,are established.(4)It is of guiding significance to improve the survey quality of soft foundation between hills in south China and reduce the change of soft foundation in the construction stage.

关 键 词：季节性软土 淤泥质软土 滑移 沉降 最不利原则 

分 类 号：TU443[建筑科学—岩土工程]