›› 2016, Vol. 37 ›› Issue (4): 1083-1088.doi: 10.16285/j.rsm.2016.04.022

• 岩土工程研究 • 上一篇    下一篇

水平旋喷桩施工引起周围土体变形分析

王志丰1,沈水龙2, 3,谢永利1   

  1. 1. 长安大学 公路学院,陕西 西安 710064;2. 上海交通大学 土木工程系,上海 200240;3. 上海交通大学 国家海洋工程重点实验室,上海 200240
  • 收稿日期:2015-07-14 出版日期:2016-04-11 发布日期:2018-06-09
  • 作者简介:王志丰,男,1986年生,博士,讲师,主要从事地下工程方面的研究工作
  • 基金资助:

    中国博士后科学基金资助项目(No. 2015M570803);国家自然科学基金资助项目(No. 41372283, No.51378004);中央高校基本科研业务费专项资金资助项目(No. 310821161022)。

Analysis of soil deformation caused by installation of horizontal jet grout column

WANG Zhi-feng1SHEN Shui-long2, 3,XIE Yong-li1   

  1. 1. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China; 2. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 3. State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2015-07-14 Online:2016-04-11 Published:2018-06-09
  • Supported by:

    This work was supported by the China Postdoctoral Science Foundation (2015M570803), National Natural Science Foundation of China (NSFC) (41372283, 51378004) and the Fundamental Research Funds for the Central Universities (310821161022).

摘要: 水平旋喷桩施工期间,大量高压流体注入土层,引起土层内部产生较大的膨胀作用,致使周围一定区域的土体发生变形。水平旋喷桩施工引起土体变形可以归结为压力膨胀和体积膨胀共同作用的问题。依托单根水平旋喷桩施工的现场实例,建立了水平旋喷桩施工引起土体变形的数值模型。将水平旋喷桩施工引起的土体变形问题简化为圆孔的膨胀问题,可以统筹考虑注浆压力和注浆流量的影响。首先需要确定注浆压力的影响半径和注浆流量引起的体积膨胀比,然后可以通过数值模型计算膨胀引起的土体变形。数值分析结果与现场实测值的对比表明,当注浆压力影响半径为成桩半径的6倍时,数值计算结果与现场实测值吻合较好。

关键词: 水平旋喷, 土体变形, 数值模拟, 地下工程

Abstract: During the installation of horizontal jet grout columns, the high pressurized fluids injected into the soil can induce the expansion of the foundation soils, causing significant movements of the soils around jet grouting locations. The soil deformation caused by installation of horizontal jet grout columns can be considered as the combined effects of the expansions induced by the high pressure and the volume of fluid. Based on a case history of the construction of horizontal jet grout column, a finite element model is developed for analysing the soil deformation caused by installation of horizontal jet grout columns. In this model, the soil deformation caused by installation of horizontal jet grout columns is simplified as the expansion of a round hole, the jetting pressure and the volume of injected fluids can be considered as a whole. A method is proposed to estimate the influencing radius of the jetting pressure, and the equations for determining the ratio of volume expansion are provided. Based on these, the soil deformation can be obtained by the finite element analysis. Comparisons of the measured values and numerical results indicate that the numerical results are in good agreement with the measured data when the influencing radius is 6 times that of the column, demonstrating the applicability of the developed finite element model.

Key words: horizontal jet grouting, soil deformation, numerical simulation, underground engineering

中图分类号: 

  • TU 443

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