胡凯, 李和元, 陈晓清, 等. 2022. 宽级配砾石土缩尺强度特性试验研究[J]. 工程地质学报, 30(4): 1069-1076. doi: 10.13544/j.cnki.jeg.2020-071.
    引用本文: 胡凯, 李和元, 陈晓清, 等. 2022. 宽级配砾石土缩尺强度特性试验研究[J]. 工程地质学报, 30(4): 1069-1076. doi: 10.13544/j.cnki.jeg.2020-071.
    Hu Kai, Li Heyuan, Chen Xiaoqing, et al. 2022. Laboratory investigation of scale strength characteristics of widely-graded gravelly soil[J]. Journal of Engineering Geology, 30(4): 1069-1076. doi: 10.13544/j.cnki.jeg.2020-071.
    Citation: Hu Kai, Li Heyuan, Chen Xiaoqing, et al. 2022. Laboratory investigation of scale strength characteristics of widely-graded gravelly soil[J]. Journal of Engineering Geology, 30(4): 1069-1076. doi: 10.13544/j.cnki.jeg.2020-071.

    宽级配砾石土缩尺强度特性试验研究

    LABORATORY INVESTIGATION OF SCALE STRENGTH CHARACTERISTICS OF WIDELY-GRADED GRAVELLY SOIL

    • 摘要: 宽级配砾石土广泛分布于泥石流易发区,其强度特性是正确评价泥石流启动和防治设计的关键性问题。为探讨宽级配砾石土强度参数与最大颗粒粒径和颗粒级配的关系,针对3种不同颗粒级配缩尺处理后最大粒径分别为30mm、20mm、10mm和5mm的宽级配砾石土进行三轴固结不排水强度试验。结果表明,宽级配砾石土具有液化特性,试验曲线表现为应变软化、应变硬化和应变软化-硬化3种形态;对于出现液化的土体,有效内摩擦角随着最大粒径的增大而线性增大;有效内摩擦角随着不均匀系数的增大而增大,两者呈二次函数关系;随着特征粒径的增大呈分段线性增大。研究结果为泥石流启动预测和防治工程设计的参数选取提供一定参考支持。

       

      Abstract: The widely-graded gravelly soil is widely distributed in the prone area of debris flow. Its strength characteristics are the key to correctly evaluate the startup and prevention design of debris flow. This paper aims to explore the relationship between the strength parameters and the maximum particle size and particle grading of widely-graded gravelly soil. It carries out the triaxial consolidated undrained strength tests for three kinds of the widely-graded gravelly soil with the maximum particle size of 30mm,20mm,10mm,5mm,respectively. The results show that the widely-graded gravelly soil has liquefaction characteristics. The test curves show three forms including strain softening,strain hardening and strain softening hardening. The effective internal friction angle of all liquefaction or effective liquefaction failure specimens increases linearly with the increase of maximum particle size. The effective internal friction angle increases quadratic polynomial with the increase of uniformity coefficient and increases piecewise linearly with the increase of characteristic particle size. The research results provide some reference support for the selection of parameters of the prediction of debris flow startup and the design of debris flow control engineering.

       

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