压实度和基质吸力对土石混合填料强度变形特性的影响研究

doi:10.16285/j.rsm.2017.11.016

›› 2017, Vol. 38 ›› Issue (11): 3205-3214.doi: 10.16285/j.rsm.2017.11.016

压实度和基质吸力对土石混合填料强度变形特性的影响研究

杨校辉^{1, 2}，朱彦鹏^{1, 2}，郭楠^{1, 2}，师占宾^{1, 2}，冉国良^{1, 2}

1. 兰州理工大学土木工程学院, 甘肃兰州 730050；2. 兰州理工大学西部土木工程防灾减灾教育部工程研究中心，甘肃兰州 730050

收稿日期:2016-06-28 出版日期:2017-11-10 发布日期:2018-06-05
作者简介:杨校辉，男，1986年生，博士，主要从事非饱和土与特殊土地基处理、支挡结构等方面的研究工作。
基金资助:
甘肃省科技重大专项计划项目（No. 1302FKDA030）；教育部长江学者创新团队支持计划项目（No. IRT13068，No. IRT_17R51）。

Research on effects of compactness and matric suction on strength deformation characteristics of soil-rock aggregate mixture

YANG Xiao-hui^{1, 2}, ZHU Yan-peng^{1, 2}, GUO Nan^{1, 2}, SHI Zhan-bin^{1, 2}, RAN Guo-liang^{1, 2}

1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China

Received:2016-06-28 Online:2017-11-10 Published:2018-06-05
Supported by:
This work was supported by the Major Project of Science and Technology Plan Projects of Gansu Province (1302FKDA030) and the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (IRT13068, IRT_17R51).

摘要/Abstract

摘要： 针对土石混合料高填方工程分析计算参数和模型确定难题，采用非饱和土三轴仪进行了控制基质吸力和净围压的36个固结排水剪切试验，定量研究了压实度、基质吸力、配合比对非饱和重塑混合料强度变形特性的影响，建立了非饱和压实土抗剪强度、切线变形模量和切线体积模量修正算法表达式。试验结果表明：破坏应力、黏聚力随吸力的增加基本呈线性增长，吸力变化对有效内摩擦角影响不大；破坏应力与强度参数随压实系数的提高而增大；土石比为4:6的土样破坏应力和强度参数整体略高于2:8的土样，有效黏聚力随粉质黏土含量的增加而增大。配合比和压实系数相同的土样，净围压或吸力越大，试样强度越大，体变逐步由剪缩趋于剪胀；净围压和吸力相同的土样，在相同配合比时，压实系数越高，应变曲线逐渐由应变硬化型向理想弹塑型转变，低净围压下部分土样趋于应变软化型。修正后的非饱和土非线性增量本构关系符合大面积填方工程实际，可用于高填方地基变形计算和高填方边坡稳定性分析。

关键词: 土石混合料, 抗剪强度, 非线性模型参数, 压实度, 基质吸力

Abstract: By using triaxial apparatus, 36 consolidated drained tests were conducted on the unsaturated soil to determine the parameters and the model of the high-fill soil-rock mixture project. The effects of compaction degree, matric suction and mixing ratio on the strength and deformation characteristics of the unsaturated remoulded mixture were quantitatively examined by controlling net confining pressure. Modified expressions for shear strength, tangent deformation modulus and tangent volume modulus of unsaturated compacted soil were also developed. The experimental results showed that the failure stress and cohesion increased linearly with the increase of suction, whereas the changes of suction had little influence on the effective internal friction angle. It was found that failure stress and strength parameters increased with the increase of compaction coefficient. The failure stress and strength parameters of soil samples with the ratio of 4: 6 were slightly higher than those of soil samples with the ratio of 2: 8. Moreover, the effective cohesion increased with the increase of silty clay content. For the same mixing proportion and compacting coefficient of soil samples, the intensity of sample grew with the increase of net confining pressure and suction. Correspondingly, its volume gradually changed from shrinkage to dilatancy. For the same net confining pressure, the suction and the mixture ratio of soil samples, the strain curve progressively turned from the strain hardening type to the ideal elastoplastic type with the increase of compaction coefficient. However, partial soil samples tended to strain softening type under the low net confining pressure. It is verified that the revised incremental nonlinear constitutive relationship of unsaturated soil is consistent with the practical project of large area fill. Thus, this study can be used for calculating the deformation of high-fill foundation and analysing the stability of the high embankment slope.

Key words: soil- rock aggregate mixture, shear strength, nonlinear model parameters, compactness, matric suction

中图分类号:

TU 443

杨校辉，朱彦鹏，郭楠，师占宾，冉国良, . 压实度和基质吸力对土石混合填料强度变形特性的影响研究[J]. , 2017, 38(11): 3205-3214.

YANG Xiao-hui, ZHU Yan-peng, GUO Nan, SHI Zhan-bin, RAN Guo-liang, . Research on effects of compactness and matric suction on strength deformation characteristics of soil-rock aggregate mixture[J]. , 2017, 38(11): 3205-3214.

参考文献

相关文章 15

[1]	桂跃, 吴承坤, 赵振兴, 刘声钧, 刘锐, 张秋敏. 微生物分解有机质作用对泥炭土工程性质的影响[J]. 岩土力学, 2020, 41(S1): 147-155.
[2]	郑方, 邵生俊, 佘芳涛, 袁浩, . 重塑黄土在不同基质吸力下的真三轴剪切试验[J]. 岩土力学, 2020, 41(S1): 156-162.
[3]	刘杰, 杨玉婳, 姚海林, 卢正, 岳婵, . 基于不同改性方法的分散性黏土处治试验研究[J]. 岩土力学, 2020, 41(S1): 163-170.
[4]	邹先坚, 王益腾, 王川婴. 钻孔图像中岩石结构面三维形貌特征及优势抗滑方向研究[J]. 岩土力学, 2020, 41(S1): 290-298.
[5]	瑜璐, 杨庆, 杨钢, 张金利. 塑性极限分析鱼雷锚锚尖贯入阻力[J]. 岩土力学, 2020, 41(6): 1953-1962.
[6]	李潇旋, 李涛, 李舰, 张涛. 循环荷载下非饱和结构性黏土的弹塑性双面模型[J]. 岩土力学, 2020, 41(4): 1153-1160.
[7]	刘建民, 邱月, 郭婷婷, 宋文智, 谷川, . 饱和粉质黏土静剪强度与振动后静剪强度对比研究[J]. 岩土力学, 2020, 41(3): 773-780.
[8]	李潇旋, 李涛, 彭丽云, . 控制吸力循环荷载下非饱和黏性土的弹塑性双面模型[J]. 岩土力学, 2020, 41(2): 552-560.
[9]	涂园, 王奎华, 周建, 胡安峰, . 有效应力法和有效固结压力法在预压地基强度计算中的应用[J]. 岩土力学, 2020, 41(2): 645-654.
[10]	李小刚, 朱长歧, 崔翔, 张珀瑜, 王睿, . 含碳酸盐混合砂的三轴剪切试验研究[J]. 岩土力学, 2020, 41(1): 123-131.
[11]	张晨阳, 谌民, 胡明鉴, 王新志, 唐健健, . 细颗粒组分含量对钙质砂抗剪强度的影响[J]. 岩土力学, 2019, 40(S1): 195-202.
[12]	王欢, 陈群, 王红鑫, 张文举, . 不同压实度和基质吸力的粉煤灰三轴试验研究[J]. 岩土力学, 2019, 40(S1): 224-230.
[13]	郑耀林, 章荣军, 郑俊杰, 董超强, 陆展, . 絮凝-固化联合处理超高含水率吹填淤泥浆的试验研究[J]. 岩土力学, 2019, 40(8): 3107-3114.
[14]	洪本根, 罗嗣海, 胡世丽, 王观石, 姚康, . 基质吸力对非饱和离子型稀土抗剪强度的影响[J]. 岩土力学, 2019, 40(6): 2303-2310.
[15]	周小文, 程力, 周密, 王齐, . 离心机中球形贯入仪贯入黏土特性[J]. 岩土力学, 2019, 40(5): 1713-1720.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

压实度和基质吸力对土石混合填料强度变形特性的影响研究

Research on effects of compactness and matric suction on strength deformation characteristics of soil-rock aggregate mixture

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 0