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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

39卷

期数:

2022年05期

页码:

193-201

栏目:

基础工程

出版日期:

2022-09-30

文章信息/Info

Title:

Study on Static Lateral Pressure Coefficient Based on Three-dimensional Stress State

文章编号:

1673-2049(2022)05-0193-09

作者:

李顺群^1,2,刘继承¹,刘小兰¹,张 彦¹,黄雄飞³

(1. 天津城建大学 土木工程学院,天津 300384; 2. 天津城建大学 天津市软土特性与工程环境重点实验室,天津 300384; 3. 安徽水安建设集团股份有限公司,安徽 合肥 230601)

Author(s):

LI Shun-qun^1,2, LIU Ji-cheng¹, LIU Xiao-lan¹, ZHANG Yan¹, HUANG Xiong-fei³

(1.School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China; 2.Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin Chengjian University, Tianjin 300384, China; 3.Anhui Shui'an Construction Group Co., Ltd., Hefei 230601, Anhui, China)

关键词:

静止侧压力系数;  圆筒模型试验;  三维应力测试方法;  浅层砂土

Keywords:

static lateral pressure coefficient;  cylinder model test;  three-dimensional stress test method;  shallow sand

分类号:

TU432

DOI:

10.19815/j.jace.2021.05057

文献标志码:

A

摘要:

为研究土体静止侧压力系数K₀,基于土的压缩变形特性,设计制作了一种能够测算K₀的圆筒模型试验装置,对天津地区浅层砂土进行了一维加卸载压缩试验。采用三维土压力盒测试了各方向土压力,得到了深度分别为20、70、120 cm处土体的三维应力状态。基于比值形式的K₀计算公式,揭示了K₀在不同深度处的变化规律,进行了同一深度水平方向x和y上K₀大小的对比分析。结果表明:经过加载、卸载和稳定3个阶段,不同深度的正应力σ_x、σ_y和σ_z均随测试时间先增大再减小后平稳,其中竖向应力值沿深度增加明显减小; 不同深度的K₀变化趋势基本一致,加载前期K₀突变是合理的,且120 cm处的稳定值满足设计规范要求; 加卸载条件下K₀值随深度增加而增大,同一深度处K0x和K0y稳定值的差值在0.04～0.07之间,这与轴对称受力条件和土的各向异性相吻合; 通过传统经验方法得到的K₀值为0.416,处于试验测算得到的K₀稳定值范围内; 该试验装置结构具有稳定性和系统性,操作简单方便,测试结果准确可靠,研究结果可为各种土的K₀研究提供参考。

Abstract:

To study the static lateral pressure coefficient K₀ of soil, based on the compression deformation characteristics of soil, a cylinder model test device which can measure K₀ was designed and made, and one-dimensional loading and unloading compression test was carried out on shallow sand in Tianjin area. The earth pressures in all directions were measured by using a three-dimensional earth pressure box, and the three-dimensional stress states of the soil at the depths of 20, 70, 120 cm were obtained. Based on the K₀ calculation formula in the form of ratio, the variation law of K₀ at different depths was revealed, and the values of K₀ in the horizontal direction x and y at the same depth were compared and analyzed. The results show that after three stages of loading, unloading and stabilization, the normal stresses σ_x, σ_y and σ_z of different depths firstly increase and then decrease and finally stabilize with the test time, and the vertical stress decreases obviously along the depth. The change trend of K₀ in different depth is basically the same, the sudden change of K₀ in the early stage of loading is reasonable, and its stable value at 120 cm meets the requirements of the design code. Under the condition of loading and unloading, the value of K₀ increases with the increase of depth, and the difference between stable values of K0x and K0y at the same depth is between 0.04 and 0.07, which is consistent with the axisymmetric stress condition and the anisotropy of soil. The K₀ value obtained by the traditional empirical method is 0.416, which is within the range of the stable K₀ value calculated by the experiment. The structure of the test device is stable and systematic, the operation is simple and convenient, the test results are accurate and reliable, and the research findings can provide a reference for the K₀ study of all kinds of soil.

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备注/Memo

备注/Memo:

收稿日期:2021-05-18
基金项目:国家自然科学基金项目(41877251); 中国交建岩土工程重点实验室开放课题(2019-KJ-Y-01); 天津科技支撑重点项目(19YFZCSF00820)
作者简介:李顺群(1971-),男,河南卫辉人,教授,博士研究生导师,工学博士,博士后,E-mail:lishunqun@yeah.net。

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更新日期/Last Update: 2022-09-30