扰动地层加固技术与效果评价研究
摘要：针对由采砂引起的特殊地质状况，采用高压喷射注浆法加固主桥桥位处的受扰动地层，通过有限元软件，建立高压喷射注浆法加固扰动地层前后的群桩有限元模型，研究受荷后群桩基础的工作性能。结果表明，采用高压喷射注浆法加固扰动地层具有良好的效果，且处理方案可有效解决由于采砂扰动引起的扩孔和护筒掉落现象，提升群桩基础的工作性能与施工质量。
关键词：桥梁工程扰动地层承载性能高压旋喷桩模拟数值
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[2] 刘汉龙，赵明华．地基处理研究进展[J]．土木工程学报，2016,49(1):96-115.
[3] 贾剑青，刘杰，赖远明，等．高压旋喷桩复合地基承载力研究[J]．中国铁道科学，2018,39(6):1-7.
[4] SHEN S L,WANG Z F,YANG J,et al. Generalized approach for prediction of jet grout column diameter[J]. Geotechnical and geoenvironmental engineering,2013,139(12):2060-2069.
[5] 程勇，黄显彬，麻超超，等．高压旋喷桩加固软基施工技术研讨[J]．工业建筑，2014,44(S1):666-668.
[6] NG K S,TAN S A. Stress transfer mechanism in 2D and 3D unit cell models for stone column improved ground[J]. International journal of geosynthetics&ground engineering,2014,1(1):1-9.
[7] LIU H,ZHOU H,KONG G,et al. High pressure jet-grouting column installation effect in soft soil:theoretical model and field application[J]. Computers and geotechnics, 2017,88(8):74-94.
[8] 陈树礼，王建雷，许宏伟，等．桥下采沙对桥梁受力及安全影响研究[J]．公路交通科技，2017,34(1):76-82.
[9] SEO H J,CHOI H S,LEE I M. Numerical and experimental investigation of pillar reinforcement with pressurized grouting and pre-stress[J]. Tunnelling and underground space technology,2016,54(4):135-144.
[10] 杜思义，石磊．竖向荷载下群桩受力特性研究[J]．郑州大学学报(工学版)，2015,36(4):67-71.
[11] BORGES J L,MARQUES D O. Geosynthetic-reinforced and jet grout column-supported embankments on soft soils:numerical analysis and parametric study[J]. Computers and geotechnics,2011,38(7):883-896.
[12] YOO,C. Settlement behavior of embankment on geosyntheticencased stone column installed soft ground—a numerical investigation[J]. Geotextiles and geomembranes,2015,43(6):484-492.
[13] SAWWAF M E,NAZIR A. The effect of soil reinforcement on pullout resistance of an existing vertical anchor plate in sand[J].Computers and geotechnics,2006,33(3):167-176.
[14] CHANDRA S D,SHASHANK K P,DAVID C. Cyclic testing and constitutive modeling of saturated sand-concrete interfaces using the disturbed state concept[J]. International journal of geomechanics,2005,5(4):286-294.
[15] 聂爽．基于ABAQUS的群桩基础沉降分析[D]．长春:吉林建筑大学，2016.
[16] 胡长明，袁一力，梅源，等．基于ABAQUS的地层-结构法模型的地应力平衡方法研究[J]．现代隧道技术，2018,55(4):76-86.
[17] 王成华，刘庆晨．考虑基坑开挖影响的群桩基础竖向承载性状数值分析[J]．岩土力学，2012,33(6):1851-1856.
[18] 陈培震，栾茂田，罗强．大直径超长群桩有效桩长问题的有限元参数分析[J]．中国科学院研究生院学报，2012,29(3):307-311.
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[21] 肖尧，赵明华，张锐，等．岩溶区桥梁双桩基础有限元极限分析[J]．工程地质学报，2019,27(4):923-932.
Research on Reinforcement Technology and Effect Evaluation of Disturbed Stratum
Abstract: The disturbed stratum is reinforced by high pressure jet grouting,for the special geological conditions caused by sand excavation. The finite element models of pile group foundation are established before and after reinforced disturbed stratum by high pressure jet grouting,the working performance of pile group foundation under load is studied. The analysis results show that the high pressure jet grouting has good reinforcement effect on disturbed stratum for sand excavation, it effectively solves the phenomena of reaming and falling of steel casing caused by sand excavation during construction process of pile foundation. The working performance and construction quality of group pile foundation are improved.
Keywords: bridges; disturbed stratum; bearing capacity; high pressure jet grouting piles; simulation; numerical
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