Volume 43 Issue 1
Jan.  2024
Turn off MathJax
Article Contents
DU Zhixiang, BAI Dingwei, SHI Bujiong, XU Rui, HUANG Shenggen. Disintegration and strength weakening characteristics of red-bed soft rock in the Shengzhou-Xinchang area under dry-wet cycles[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 253-261. doi: 10.19509/j.cnki.dzkq.tb20220314
Citation: DU Zhixiang, BAI Dingwei, SHI Bujiong, XU Rui, HUANG Shenggen. Disintegration and strength weakening characteristics of red-bed soft rock in the Shengzhou-Xinchang area under dry-wet cycles[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 253-261. doi: 10.19509/j.cnki.dzkq.tb20220314

Disintegration and strength weakening characteristics of red-bed soft rock in the Shengzhou-Xinchang area under dry-wet cycles

doi: 10.19509/j.cnki.dzkq.tb20220314
More Information
  • Author Bio:

    DU Zhixiang, E-mail: HZFJGW@163.com

  • Corresponding author: XU Rui, E-mail: cugxurui@cug.edu.cn
  • Received Date: 04 Jul 2022
  • Accepted Date: 26 Jul 2022
  • Rev Recd Date: 22 Jul 2022
  • Objective

    The red-bed soft rocks is easy to disintegrate and weaken its strength when it encounters water, which is easy to cause poor stability and economic loss or even casualties in slope construction. It is of great significance to reveal the variation characteristics of cohesion and internal friction angle of red-bed soft rocks under the action of dry and wet cycling for the design of slope treatment measures.

    Methods

    Investigating the three groups of red-bed soft rock formations within the Lower Cretaceous Chaochuan Formation situated in the Shengzhou-Xinchang region of Zhejiang Province, this study delves into the disintegration and strength attention tendencies inherent in these formations. This exploration unfolds through a comprehensive suite of method ologies, including dry-wet cycle tests, point load strength tests of disintegrated rock blocks and direct shear tests of disintegrated particles.

    Results

    The results reveal that the sample undergoes disintegrates, in the form of fragments, particle slag, and mud paste due to successive dry-wet cycles. The main disintegration process can be divided into four distinct stages: Initial disintegration, rapid disintegration, fine reconfiguration, and eventual stabilization. The point load strength of the sample decreases with the increase as the number of dry-wet cycles increases, while the disintegration resistance index Idn shows a positive exponential relationship with the point load strength Is(50). Notably, the point load strength Is(50) of the sample experiences rapid weakening between 80% to 100% and 50% to 80% of the disintegration resistance index Idn, demonstrating gradual attenuation characteristics. The peak shear strength of the sample ranges between 1.219 MPa and 0.567 MPa, which mostly occurs before and after the shear displacement of 3 mm. Under the consistent axial pressure, the peak shear strength of the same group decreases with an increasing number of cycles. Additionally, the internal friction angle of disintegrated particles of the sample ranges from 22.28° to 33.03°, while the cohesion is between 0.46 MPa and 0.74 MPa. Both the friction angle and cohesion of the sample show a negative exponential relationship with the number of dry-wet cycles.

    Conclusion

    The test results indicate that siliceous cementation exhibits better disintegration resistance compared to argillaceous cementation, and the rock with high clay minerals more easily disintegrates. Additionally, the water absorption and expansion capacity of "white mineral" albite significantly lag behind that of clay minerals, with a lesser variance in its content compared to clay minerals.

     

  • The authors declare that no competing interests exist.
  • loading
  • [1]
    张子涵, 魏文, 张杰, 等. 基于CT扫描红层砂岩孔隙多标度分形维数的确定方法[J]. 地质科技通报, 2022, 41(3): 254-263. doi: 10.19509/j.cnki.dzkq.2021.0066

    ZHANG Z H, WEI W, ZHANG J, et al. Determining method of multiscale fractal dimension of red bed sandstone pores based on CT scanning[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 254-263. (in Chinese with English abstract) doi: 10.19509/j.cnki.dzkq.2021.0066
    [2]
    谢妮, 王丁浩, 吕阳, 等. 酸腐蚀作用下川渝红层砂岩蠕变特性试验研究[J]. 地质科技通报, 2022, 42(1): 1-9. doi: 10.19509/j.cnki.dzkq.2022.0142

    XIE N, WANG D H, LÜ Y, et al. Experimental study on creep behavior of red sandstone in Sichuan and Chongqing under acid corrosion[J]. Bulletin of Geological Science and Technology, 2022, 42(1): 1-9. (in Chinese with English abstract) doi: 10.19509/j.cnki.dzkq.2022.0142
    [3]
    LÜ L L, LIAO H J, FU Y P, et al. Experimental study on mechanical properties of red bed soft rock from Humaling Tunnel in confining and triaxial compression tests[J]. Journal of Central South University(Science and Technology), 2022, 53(4): 1362-1370.
    [4]
    王腾飞, 李远耀, 徐勇, 等. 基于声发射试验的红层砂岩损伤演化特性分析[J]. 地质科技情报, 2019, 38(4): 247-254.

    WANG T F, LI Y Y, XU Y, et al. Damage evolution analysis of red sandstone based on acoustic emission test[J]. Geological Science and Technology Information, 2019, 38(4): 247-254. (in Chinese with English abstract)
    [5]
    HUANG K, KANG B, ZHA F S, et al. Disintegration characteristics and mechanism of red-bed argillaceous siltstone under drying-wetting cycle[J]. Environmental Earth Sciences, 2022, 81(12): 1-14.
    [6]
    LI A R, DENG H, ZHANG H J, et al. The shear-creep behavior of the weak interlayer mudstone in a red-bed soft rock in acidic environments and its modeling with an improved Burgers model[J]. Mechanics of Time-Dependent Materials, 2023, 27(1): 1-18. doi: 10.1007/s11043-021-09523-y
    [7]
    彭华. 中国南方湿润区红层地貌及相关问题探讨[J]. 地理研究, 2011, 30(10): 1739-1752.

    PENG H. Discussion on red bed landform and related problems in humid areas of southern China[J]Geographical Research, 2011, 30 (10): 1739-1752. (in Chinese with English abstract)
    [8]
    原鹏博, 杨烜宇, 赵天宇. 水-盐作用下红层砂岩声波特性劣化试验[J]. 岩土力学, 2019, 40(1): 227-234.

    YUAN P B, YANG J Y, ZHAO T Y. Deterioration characteristics of red-bed sandstone acoustic wave properties due to water and salt solution[J]. Rock and Soil Mechanics, 2019, 40(1): 227-234. (in Chinese with English abstract)
    [9]
    邓涛, 詹金武, 黄明, 等. 酸碱环境下红层软岩-泥质页岩的崩解特性试验研究[J]. 工程地质学报, 2014, 22(2): 238-243.

    DENG T, ZHAN J W, HUANG M, et al. Disintegration characteristics test of red-bed soft rock argillaceous shale in acid and alkali environment[J]Journal of Engineering Geology, 2014, 22 (2): 238-243. (in Chinese with English abstract)
    [10]
    杨峰峰, 张巨峰, 郑超, 等. 湘潭地区红层软岩在淋雨条件下崩解的分形维数研究[J]. 水资源与水工程学报, 2020, 31(5): 213-217.

    YANG F F, ZHANG J F, ZHENG C, et al. Study on the fractal dimension of red-bed soft rock disintegration in Xiangtan, Hunan Province under rain conditions[J]. Journal of Water Resources & Water Engineering, 2020, 31(5): 213-217. (in Chinese with English abstract)
    [11]
    陈康, 刘先峰, 袁胜洋, 等. 饱和红层泥岩填料累积变形特性及安定界限研究[J]. 岩土力学, 2022, 43(5): 1261-1268.

    CHEN K, LIU X F, YUAN S Y, et al. Experimental investigation on accumulative deformation behaviour and shakedown limit of saturated red mudstone fill material[J]. Rock and Soil Mechanics, 2022, 43 (5): 1261-1268. (in Chinese with English abstract)
    [12]
    谭玉芳, 李丽慧, 杨志法, 等. 红层砂岩与砾岩差异风化的湿度应力效应研究[J]. 岩石力学与工程学报, 2019, 38(增刊2): 3481-3492.

    TAN Y F, LI L H, YANG Z F, et al. Moisture stress effect and its control on differential weathering of red-bed sandstone and conglomerate[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38 (S2): 3481-3492. (in Chinese with English abstract)
    [13]
    纪宇, 梁庆国, 郭俊彦, 等. 红层软岩地区高速铁路深路堑基底变形规律研究[J]. 铁道科学与工程学报, 2021, 18(3): 572-580.

    JI Y, LIANG Q G, GUO J Y, et al. Study on deformation law of deep foundation of high speed railway in red layer soft rock area[J]. Journal of Railway Science and Engineering, 2021, 18 (3): 572-580. (in Chinese with English abstract)
    [14]
    潘艺, 刘镇, 周翠英. 红层软岩遇水崩解特性试验及其界面模型[J]. 岩土力学, 2017, 38(11): 3231-3239.

    PAN Y, LIU Z, ZHOU C Y. Experimental study of disintegration characteristics of red-bed soft rock within water and its interface model[J]. Rock and Soil Mechanics, 2017, 38 (11): 3231-3239. (in Chinese with English abstract)
    [15]
    ZHOU M, LI J, LUO Z, et al. Impact of water-rock interaction on the pore structures of red-bed soft rock[J]. Scientific Reports, 2021, 11(1): 1-15. doi: 10.1038/s41598-020-79139-8
    [16]
    XIE X S, CHEN H S, XIAO X H, et al. Micro-structural characteristics and softening mechanism of red-bed soft rock under water-rock interaction condition[J]. Journal of Engineering Geology, 2019, 27(5): 966-972.
    [17]
    LI A R, DENG H, WANG X X, et al. Research on creep characteristics and constitutive model of red bed mudstone under saturated-dehydrated cycle[J]. Journal of Engineering Geology, 2021, 29(3): 843-850.
    [18]
    ZHANG Z T, GAO W H. Effect of different test methods on the disintegration behaviour of soft rock and the evolution model of disintegration breakage under cyclic wetting and drying[J]. Engineering Geology, 2020, 279: 105888. doi: 10.1016/j.enggeo.2020.105888
    [19]
    YU F, TONG K W, DAI Z J, et al. Macro-and microresearch on swelling characteristics and deformation mechanism of red-bed mudstone in Central Sichuan, China[J]. Geofluids, 2022, 2022.
    [20]
    LIAO H C, LI Z H, DIAO K, et al. Red-bed soft rock slope reinforcement effect under construction based on FLAC3D[J]. Journal of Changsha University of Science & Technology, 2012: 9(4): 25-31.
    [21]
    ZHANG L M, ZHAO H Y, LU L F. Engineering geologic characteristics and mechanical property of red-bed soft rock in water diversion project in Yunnan Province[J]. Water Resources and Power, 2016, 34(8): 75-78.
    [22]
    谌文武, 原鹏博, 刘小伟. 分级加载条件下红层软岩蠕变特性试验研究[J]. 岩石力学与工程学报, 2009, 28(增刊1): 3076-3081.

    CHEN W W, YUAN P B, LIU X W. Study on creep properties of red-bed soft rock under step load[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28 (S1): 3076-3081. (in Chinese with English abstract)
    [23]
    DENG H F, FANG J C, LI J L, et al. Mechanical properties of red-bed soft rock on saturated state[J]. Journal of China Coal Society, 2017, 42(8): 1994-2002.
    [24]
    岩石物理力学性质试验规程: DZ/T 0276.23-2015[S]. 北京: 中国标准出版社, 2015.

    Regulation for testing the physical and mechanical properties of rock: DZ/T 0276.23-2015[S]. Beijing: China Standards Press, 2015. (in Chinese with English abstract)
    [25]
    邬爱清, 赵文, 周火明, 等. 工程岩体分级标准: GB 50218-2014[S]. 北京: 中国计划出版社, 2014.

    WU A Q, ZHAO W, ZHOU H M, et al. Standard for engineering classification of rock mass: GB50218-2014[S]. Beijing: China Planning Press, 2014. (in Chinese with English abstract)
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Article Metrics

    Article Views(288) PDF Downloads(63) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return