滨海潮汐岩溶地表软土注浆技术研究与应用  

Grouting technology for surface soft soil in coastal tidal karst area and its application

作　　者：高晓杰 李召峰[1] 林久卿 宋云龙 青尚杰 崔向东 彭晓光 GAO Xiao-jie;LI Zhao-feng;LIN Jiu-qing;SONG Yun-long;QING Shang-jie;CUI Xiang-dong;PENG Xiao-guang(Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China;Shandong Zhengyuan Construction Engineering Limited Company,Jinan 250098,China;China Resources Cement(Hepu)Limited Company,Beihai 536119,China;China Resources Cement Investments Limited Company,Shenzhen 518001,China)

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061 [2]山东正元建设工程有限责任公司,山东济南250098 [3]华润水泥(合浦)有限公司,广西北海536119 [4]华润水泥投资有限公司,广东深圳518001

出　　处：《浙江大学学报（工学版）》2023年第3期552-561,共10页Journal of Zhejiang University：Engineering Science

基　　金：山东省重大科技创新工程项目(2021CXGCO10301,2020CXGC011405);山东省自然科学基金重点项目(ZR2020KE006).

摘　　要：针对滨海岩溶第四系表层土质地松软、承压能力弱的工程施工难题,以某公司矿山首采区周边土层为研究对象,考虑滨海潮汐作用导致渗流水头变化的特殊因素,通过室内模型试验的手段,选取工程常用水泥-水玻璃双浆液对岩溶表层松软土层进行注浆加固试验研究.结果表明:潮汐半潮及高潮环境下浆脉形态多样,且前进式注浆工艺加固效果最佳;埋深60 cm处定点注浆技术在承压能力及水稳特性提升方面具有最优的增长速率,被注土层抗压强度最大增幅为46.8%,水稳特性增幅区间为773 s.确定将现场采用半潮时段定点注浆技术、注浆深度为表土层平均深度的2/3处,作为滨海岩溶上表松软土层的最佳加固方案.The soil around the first mining area of a company was taken as the research object,aiming at the engineering problems of soft and weak bearing capacity of Quaternary surface soil in coastal karst area.In consideration of the change of water head under tidal action,through the means of indoor model test,the cement-water glass double slurry commonly used in engineering was selected to study the grouting reinforcement of karst surface soft soil layer.Results show that the shape of plasma veins is various in the tidal semitidal and high tide environments,and the advanced grouting technology has the best reinforcement effect.Results also show that the fixed-point grouting technology at the buried depth of 60 cm has the optimal growth rate in the improvement of bearing capacity and water stability characteristics.The maximum increase of compressive strength of the injected soil layer was 46.8%,and the increase range of water stability characteristics was 773 s.The site adopts the fixed-point grouting technology in the half tide period,and the grouting depth is 2/3 of the average depth of the topsoil as the best reinforcement scheme for the coastal karst soft soil layer.

关 键 词：滨海岩溶 松软土层 注浆加固 注浆工艺 工程应用 

分 类 号：TU45[建筑科学—岩土工程]