土工格栅加筋橡胶砂应力-应变特性试验

doi:10.13229/j.cnki.jdxbgxb.20211260

Abstract

Abstract:

Based on the static triaxial shear test， the stress-strain characteristics， the modulus attenuation properties， and the normalized stress-strain behavior of reinforcing rubber sand mixtures were analyzed. Five kinds of rubber content （0%， 10%， 20%， 30%， and 40%）， four kinds of geogrid reinforcing patterns （lateral arrangement with no layer/one layer/two layers/three layers）， and three kinds of confining pressure（50 kPa、100 kPa、200 kPa） were taken into account in tests. Results indicate that ①The geogrid reinforcement makes stress-strain curves of rubber sand mixture raised obviously， and the hardening characteristics of the reinforced specimens are enhanced. ②The stress-strain behavior of the rubber sand mixture could be simulated well by the extended Duncan-chang hyperbola model， and the model parameters are evaluated with rubber content in the rubber sand mixture. With the increase of rubber content， the initial modulus of the rubber sand mixture decreases， and the attenuation parameters can quantitatively reflect the degree of modulus attenuation. The attenuation degree of rubber sand mixture increases for geogrid reinforcing cases lateral arrangement with three layers/no layer/two layers/one layer， but the overall difference is insignificant. ③With the use of geogrid reinforced， the reference strain of the rubber sand is increased while the index of the stress-strain model is decreased. To illustrate， the degree of nonlinearity of the normalized stress-strain curve of the modulus is weakened. With the increase of the geogrid-reinforced density and rubber content， the reinforcement effect of geogrid on the stress-strain characteristics of rubber sand is more significant.

Key words: geotechnical engineering, rubber sand mixture, geogrid reinforcement, triaxial shear tests, stress-strain relationship, geo-reinforcement effects

CLC Number:

TU411.3

Fang-cheng LIU,Jiang WANG,Meng-tao WU,Guo-bin BU,Jie HE. Stress⁃strain characteristics of geogrid reinforced rubber sand mixtures[J].Journal of Jilin University(Engineering and Technology Edition), 2023, 53(9): 2542-2553.

Figures/Tables 24

Table 1

Table 2

Fig.1

Fig.2

Table 3

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Table 4

Values of failure stress and fitted parameters of stress-strain relationship of geogrid reinforced RSM"

RC/%	σ₃/kPa	无筋			1层加筋			2层加筋			3层加筋
RC/%	σ₃/kPa	E₀/MPa	$ε r$ /%	$α$	E₀/MPa	$ε r$ /%	$α$	E₀/MPa	$ε r$ /%	$α$	E₀/MPa	$ε r$ /%	$α$
0	50	22.64	1.76	1.38	31.80	1.29	1.22	37.78	1.07	1.11	26.90	2.01	1.14
	100	26.24	2.78	1.39	31.18	2.45	1.30	25.89	3.43	1.41	28.09	2.68	1.12
	200	35.86	4.36	1.63	37.09	4.57	1.52	41.23	4.24	1.34	47.55	3.28	1.15
10	50	7.97	4.89	1.49	7.09	6.88	1.61	9.12	6.02	1.62	11.88	4.87	1.31
	100	10.49	6.79	1.85	10.88	7.04	1.52	9.76	9.08	1.66	12.33	7.72	1.39
	200	14.97	8.52	1.89	15.46	9.03	1.65	20.45	6.97	1.35	20.03	7.75	1.33
20	50	3.57	10.00	1.85	5.51	6.08	1.10	5.47	7.48	1.01	3.97	17.00	1.83
	100	5.77	11.48	2.20	6.59	11.42	1.52	6.29	14.12	1.76	6.31	16.56	1.47
	200	8.53	12.73	1.99	9.59	13.47	1.77	9.16	17.42	1.38	10.91	15.06	1.38
30	50	2.58	11.44	1.88	4.20	6.65	1.16	3.98	8.69	1.18	2.64	21.50	1.61
	100	4.34	12.82	1.87	4.53	14.27	1.57	4.61	15.34	1.29	4.29	21.61	1.41
	200	5.93	15.88	1.85	6.58	15.63	1.26	5.70	25.21	1.14	6.32	22.31	1.38
40	50	2.19	11.59	1.60	2.17	15.19	1.59	2.20	17.11	1.39	2.13	23.76	0.71
	100	3.14	15.20	1.69	3.29	16.00	1.01	3.88	13.84	0.64	4.40	23.81	0.70
	200	4.13	19.70	2.27	4.62	22.19	1.26	5.18	20.70	1.14	5.28	21.33	1.71

Table 4

Fig.9

Fig.10

Fig.11

Table 5

Fig.12

Fig.13

Fig.14

Fig.15

Fig.16

Table 6

Fitted values of slope coefficient between reinforcement effects coefficient andreinforcement density"

参数	RC/%
参数	0	10	20	30	40
$C E$	0.190	0.183	0.174	0.102	0.148
$C ε$	-0.054	0.067	0.206	0.318	0.308
$C α$	-0.141	-0.135	-0.224	-0.235	-0.358

Table 6

Fig.17

Fig.18

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试验材料	比重G_s	粒径/mm	平均粒径D₅₀	不均匀系数C_u
废橡胶颗粒	1.21	0.5~5	1.5	4.77
标准砂	2.63	0.05~2	0.64	2.23

材料	网格尺寸/mm	延伸率/%	弹性模量/GPa	抗拉强度/（kN·m^-1）
材料	网格尺寸/mm	延伸率/%	弹性模量/GPa	纵向	横向
玻璃纤维	12.7×12.7	≤3	67	60	60

配合比RC/%	ρ_dmin/ （g·cm^-3）	ρ_dmax/ （g·cm^-3）	相对密度D_r	装样密度ρ/ （g·cm^-3）
0	1.51	1.86	0.7	1.74
10	1.38	1.71	0.7	1.60
20	1.21	1.50	0.7	1.40
30	1.04	1.29	0.7	1.20
40	0.87	1.17	0.7	1.06

加筋方式	衰减参数A
无筋	0.182（本文试验）
	0.324（El-Sherbiny等）^［36］
	0.197（Youwai等）^［37］
水平1层加筋	0.197
水平2层加筋	0.184
水平3层加筋	0.165

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Stress⁃strain characteristics of geogrid reinforced rubber sand mixtures

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