法向循环荷载下格栅加筋盐渍土剪切性能研究

doi:10.13722/j.cnki.jrme.2022.0674

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摘要为了研究法向循环荷载作用下格栅加筋盐渍土的剪切性能，采用大型直剪试验，研究静荷载、法向循环荷载初始应力、循环幅值以及循环频率等对2种格栅加筋盐渍土剪切性能的影响。结果表明，格栅能较好地改善盐渍土的剪切性能，本文工况下，格栅加筋粗颗粒硫酸盐盐渍土的剪切性能总体高于格栅加筋粗颗粒氯盐盐渍土的。格栅加筋粗颗粒氯盐盐渍土的剪切性能随着频率的增大而减小，但其剪切性能与幅值的相关性并不明显。较低的初始法向应力会降低格栅加筋粗颗粒硫酸盐盐渍土的剪切性能，且在低初始法向应力下，其剪切性能随着幅值的增加几乎不变。频率越低，格栅加筋粗颗粒硫酸盐盐渍土的剪切性能越弱，其出现峰值强度的剪切位移越小。

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	侯娟1
	2
	3
	楚辰玺1
	孙银玉1
	文平4
	马艳霞3
	张吾渝3

关键词 ：土力学, 粗颗粒盐渍土, 硫酸盐, 氯盐, 剪切性能, 法向循环荷载

Abstract：Large-scale direct shear tests were conducted to investigate the shear behavior of geogrid reinforced coarse grained saline soils under normal cyclic loading. The effects of static loading，the initial stress, cyclic amplitude，and cyclic frequency of normal cyclic loading on the shear behavior of two geogrid reinforced coarse-grained saline soils were studied. The results showed that the shear strength of the coarse grained saline soils could be improved by geogrid. The shear strength of geogrid reinforced coarse-grained sulfate saline soils was generally higher than that of geogrid-reinforced coarse-grained chloride saline soils. The shear strength of the geogrid reinforced coarse-grained chloride saline soils decreased with increase of frequency. However，there is no obvious correlation between the shear behavior and amplitude. The lower initial normal stress reduced the shear strength of geogrid reinforced coarse-grained sulfate saline soil. The smaller the frequency, the lower the shear strength of the geogrid reinforced coarse-grained sulfate saline soils，and the smaller the shear displacement of the peak strength.

Key words： soil mechanics;coarse grained saline soil;sulfate salt soil;chlorine salt soil;shear behavior normal cyclic loading

引用本文:

侯娟1，2，3，楚辰玺1，孙银玉1，文平4，马艳霞3，张吾渝3. 法向循环荷载下格栅加筋盐渍土剪切性能研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3832-3841.
HOU Juan1，2，3，CHU Chenxi1，SUN Yinyu1，WENG Ping4，MA Yanxia3，ZHANG Wuyu3. Shear behaviors of geogrid reinforced saline soil under vertical cyclic loading. , 2023, 42(S1): 3832-3841.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0674 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3832

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