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土工格室加筋正常固结粉质黏土应力应变响应

宋飞 石磊 樊明尊

宋飞, 石磊, 樊明尊. 土工格室加筋正常固结粉质黏土应力应变响应[J]. 地质科技通报, 2024, 43(1): 184-193. doi: 10.19509/j.cnki.dzkq.tb20220428
引用本文: 宋飞, 石磊, 樊明尊. 土工格室加筋正常固结粉质黏土应力应变响应[J]. 地质科技通报, 2024, 43(1): 184-193. doi: 10.19509/j.cnki.dzkq.tb20220428
SONG Fei, SHI Lei, FAN Mingzun. Stress-strain response of geocell-reinforced normally consolidated silty clay[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 184-193. doi: 10.19509/j.cnki.dzkq.tb20220428
Citation: SONG Fei, SHI Lei, FAN Mingzun. Stress-strain response of geocell-reinforced normally consolidated silty clay[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 184-193. doi: 10.19509/j.cnki.dzkq.tb20220428

土工格室加筋正常固结粉质黏土应力应变响应

doi: 10.19509/j.cnki.dzkq.tb20220428
基金项目: 

国家自然科学基金项目 52278328

中建新疆建工科技研发课题 65000022859700210197

详细信息
    通讯作者:

    宋飞, E-mail: songf1980@163.com

  • 中图分类号: P642.16

Stress-strain response of geocell-reinforced normally consolidated silty clay

More Information
  • 摘要:

    土工格室加筋正常固结粉质黏土对工程建设意义重大。基于土工格室与填土的相互作用机制和增量法,采用弹塑性理论、邓肯-张双曲线模型、修正剑桥屈服函数以及剪胀方程,推导了土工格室加筋正常固结黏土的应力应变响应计算模型,进行了土工格室加筋正常固结黏土的三轴固结排水剪切试验,实测不同围压下的应力应变关系,采用三轴试验结果验证了所提理论模型的正确性和可靠性。此外,采用所提理论模型进行了参数敏感分析,研究了填土的力学性质参数、格室的网格尺寸和力学性质参数对于加筋土应力应变响应的影响。研究结论表明,与砂砾料相似,土工格室约束作用对于正常固结黏土的内摩擦角影响较小,而黏聚力有所增加;随着轴向应变的增加或围压的减小,加筋效果逐渐明显;加筋正常固结黏土的强度和刚度随着非线性弹性常数k的增加、强度参数φ的增加和Rf的减小而增大,常数n对于加筋土应力应变响应影响较小。本研究成果可为工程建设提供理论借鉴。

     

  • 图 1  应力应变关系计算分析流程图

    Figure 1.  Flowchart to predict the stress-strain responses of geosynthetic-encased soil

    图 2  土工格室及其加筋黏土试样

    Figure 2.  Geocell and the reinforced clay specimen

    图 3  土工格室条带拉伸曲线

    Figure 3.  Load-strain curve of the geocell sheet

    图 4  素土及格室加筋土应力应变曲线

    Figure 4.  Stress-strain curves of unreinforced and reinforced clay specimens

    图 5  模量增强系数随轴向应变变化

    Figure 5.  Variation in the increasing coefficient with the axial strain

    图 6  素土及格室加筋土摩尔圆

    Figure 6.  Mohr circles of unreinforced and reinforced clay

    图 7  素土计算参数标定

    Figure 7.  Calibration of calculation parameters of unreinforced soil

    图 8  理论分析方法验证

    Figure 8.  Validation of the proposed method via triaxial compression tests

    图 9  参数敏感分析

    Figure 9.  Parameter sensitivity analysis

    表  1  填土主要物理性质指标

    Table  1.   Physical properties of the backfill used in the test

    比重 液限/% 塑限/% 最优含水量/% 最大干密度/(g·cm-3)
    2.67 29.5 18.1 16.0 1.66
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  • 收稿日期:  2022-08-04
  • 录用日期:  2022-11-09
  • 修回日期:  2022-10-31

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