改性石灰土在干湿和冻融循环下的无侧限抗压性能

doi:10.13229/j.cnki.jdxbgxb.20221376

摘要/Abstract

摘要：

为进一步提升在复杂环境工程中石灰土的适用性和安全性，利用纳米粘土和纤维改性石灰土的力学性能。通过分析改性石灰土在干湿循环和冻融循环作用下的无侧限抗压性能，从而判断纳米粘土和纤维对石灰土的改性效果。试验结果证明，纤维和纳米粘土可以提高石灰土的抗压强度和残余强度，增大破坏应变，改变破坏模式。尤其在纤维和纳米粘土的复合作用下纳米粘土/纤维改性石灰土（NFLS）呈现出最优无侧限抗压性能，并能够延缓因干湿循环和冻融循环作用导致的NFLS内部损伤。

关键词: 道路工程, 改性石灰土, 冻融循环, 干湿循环, 无侧限抗压性能

Abstract:

In order to further improve the applicability and safety of lime stabilized soil in complex environmental engineering， the mechanical properties of lime stabilized soil modified by nano clay and fiber were studied. By analyzing the unconfined compression behavior of modified lime stabilized soil under the action of dry wet cycle and freeze-thaw cycle， the modified effect of nano clay and fiber on lime stabilized soil can be judged. The test results show that fiber and nano clay can improve the compressive strength and residual strength of lime stabilized soil， increase the failure strain and change the failure mode. Especially， under the combined action of fiber and nano clay， nano clay/fiber modified lime soil （NFLS） presents the best unconfined compression behavior， and can delay the internal damage of NFLS caused by dry wet cycle and freeze-thaw cycle.

Key words: road engineering, modified lime stabilized soil, freeze thaw cycle, dry wet cycle, unconfined compression behavior

中图分类号:

TU447

姜屏,陈业文,陈先华,张伟清,李娜,王伟. 改性石灰土在干湿和冻融循环下的无侧限抗压性能[J]. 吉林大学学报(工学版), 2023, 53(6): 1809-1818.

Ping JIANG,Ye-wen CHEN,Xian-hua CHEN,Wei-qing ZHANG,Na LI,Wei WANG. Unconfined compression behavior of modified lime stabilized soil under dry wet and freeze⁃thaw cycles[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(6): 1809-1818.

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组号	试样序号	配比组合	冻融循环次数	干湿循环次数	养护龄期/d
A	1~5	L6	0、1、3、5、7	0、1、3、5、7	28
B	6~10	L6-N6
C	11~15	L6-F0.5
D	16~20	L6-N4-F0.75

冻融循环次数	L6	L6-N6	L6-F0.5	L6-N4-F0.75
0	1.89	2.23	3.22	3.89
1	2.56	2.56	3.89	4.23
3	4.57	2.88	4.90	4.90
5	3.22	2.88	3.90	6.23
7	3.23	2.88	2.88	4.57

干湿循环次数	L6	L6-N6	L6-F0.5	L6-N4-F0.75
0	1.89	2.23	3.22	3.89
1	2.56	2.56	3.90	4.23
3	2.90	2.22	4.57	3.23
5	2.90	2.56	4.90	4.24
7	2.56	2.22	4.57	4.23

冻融循环次数	L6	L6-N6	L6-F0.5	L6-N4-F0.75
0	16.55	30.88	40.16	63.13
1	22.29	31.65	45.12	61.84
3	31.42	25.52	37.18	41.92
5	4.59	17.33	18.77	37.58
7	2.35	10.73	14.52	19.47

干湿循环次数	L6	L6-N6	L6-F0.5	L6-N4-F0.75
0	16.55	30.88	40.16	63.13
1	23.50	35.18	50.13	61.84
3	21.28	27.77	47.05	65.15
5	14.83	24.46	38.96	54.41
7	12.65	23.52	32.28	52.42