土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (4): 526-530.

• 测试技术 • 上一篇    下一篇

宽级配砾质土三轴固结排水剪切试验研究

李方振1,2   

  1. (1.福建省地质工程勘察，福州 350002；2.自然资源部丘陵山地地质灾害防治重点实验室，福州 350002）
  • 收稿日期:2020-10-29 修回日期:2020-11-23 出版日期:2021-08-31 发布日期:2021-08-20
  • 作者简介:李方振 (1985-)，男，硕士，工程师，研究方向为岩土工程、地质灾害防治。
  • 基金资助:
    国家自然科学基金（41977259，51609040），福建省自然科学基金（2016J05112）

Triaxial Consolidated-Drained Compressive Shear Tests of a Wide Graded Gravelly Soil

LI Fangzhen1,2   

  1. (1.Fujian Geological Engineering Survey Institute Co. Ltd., Fuzhou 350002;
    2.Key Laboratory of Geohazard Prevention of Hilly Mountains, Ministry of Natural Resources of China, Fuzhou 350002)
  • Received:2020-10-29 Revised:2020-11-23 Online:2021-08-31 Published:2021-08-20

摘要： 对宽级配砾质土进行三轴固结排水剪切试验，研究砾石含量和干密度对宽级配砾质土抗剪强度、应力应变关系、邓肯非线性强度参数的影响。研究表明，随着砾石含量和试样干密度的变化，宽级配砾质土的抗剪强度以及邓肯非线性强度参数均呈现出一定的变化规律。根据试验结果统计，宽级配砾质土内摩擦角φ和非线性强度指标φ0均随砾石含量的增加逐渐增大，粘聚力c随砾石含量的增加先增大后减小；内摩擦角φ和φ0、Δφ基本表现为随着干密度的增大而增加趋势，而粘聚力c表现为随着干密度的增大先增大再减小。

关键词: 宽级配砾质土, 干密度, 含水率, 抗剪强度

Abstract: In this paper, a series of triaxial consolidated-drained compressive shear tests (CD-test) were performed on a wide graded gravelly soil sample. The shear strength, stress-stain properties and the nonlinear parameters of Duncan model of this wide graded gravelly soil sample under different gravel contents and dry densities were devaluated. The results indicate that the shear strength and the parameters of Duncan model of this wide graded gravelly soil sample exhibit correlations with various of gravel contents and dry densities. When the content of coarse gravelly grains increases, the angle of internal friction φ and φ0 also increases, the cohesion c increases initially then decreases. When the dry density increases, the angle of internal friction φ and φ0 and Δφ increases, the cohesion c increases initially then decreases.

Key words: Wide Graded Gravelly Soil, Dry Density, Water Content, Shear Strength

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