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

Abstract

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

CLC Number:

TU447

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.

Figures/Tables 13

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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

Unconfined compression behavior of modified lime stabilized soil under dry wet and freeze⁃thaw cycles

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