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书 书 书

52

 

2017

       

西

 

 

 

 

 

 

 

JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY

        Vol. 52  No. 3 Jun. 2017

稿

20150623

:国

51278216

51478201

:郑

1967

),男

,教

,博

,博

,研

Email

zhengjj@ hust. edu. cn

:郑

,周

,曹

,等

西

2017

52

):

482488. ZHENG Junjie

ZHOU Yanjun

CAO Wenzhao

et al. Experimental study of interface behavior of geogrids with different aperture shapes

. Journal of Southwest Jiaotong University

2017

52

):

482488.    

02582724

2017

03048207    DOI

10. 3969 / j. issn. 02582724. 2017. 03. 007

不同网孔形状格栅加筋土界面特性试验研究

 

 

 

 

(华

,湖

北武

430074

 

:为

,选

、筋

、界

,对

,结

:三

;对

,工

TX_0

TX_90

48. 2°

38. 2°

,矩

SS20

35. 9°

;拉

,三

线

,矩

:拉

;网

;筋

;土

TU501   

Experimental Study of Interface Behavior of

Geogrids with Different Aperture Shapes

ZHENG Junjie

  ZHOU Yanjun

  CAO Wenzhao

  LAI Hanjiang

  YANG Youbin

Institute of Geotechnical and Underground Engineering

Huazhong University of Science and Technology

Wuhan 430074

China

Abstract

In order to investigate the effect of aperture shape on the geogridsoil interface behavior

tensile tests were conducted using two kinds of geogrids with triangular apertures and rectangular

apertures

which are of similar aperture size and mechanical properties. The effect of aperture shape on

the geogridsoil interface behavior under different normal pressures and pullout test directions were

analyzed in terms of the pullout resistance

shear strength of geogridsoil interface

apparent friction

coefficient and geogrid rib deformation. The results show that the geogrid with triangular apertures

plays a better role than the geogrid with rectangular apertures in restraining the lateral displacement of

soil. For the geogrid with triangular apertures

the peak values of friction angle in cases TX _0 and

TX_90 were 48. 2° and 38. 2°

respectively

while the peak value of friction angle in case SS20 case

was only 35. 9°. The flexural deformation of different degrees was observed in the horizontal and

diagonal ribs of the geogrid with triangular apertures during the pullout test

while the ribs of the

geogrid with rectangular apertures mainly presented a tensile deformation.

Key words

pullout test

aperture shape

geogridsoil interface behavior

geogrids

   

、吹

、垃

领 域

,土工合成材料的应用需求日益增

(2)

,等

:不

,以

13

46

,对

,诸

,包

、砂

、土

79

,格

,特

,具

,能

,进

1013

,本

文基于三向土工格栅(

TX

)和双向土工格

SS

)不

,对

,并

、筋

、格

1 

、材

1. 1 

   

,试

,上

60 cm × 30 cm × 15 cm

,拉

,垂

荷载通过刚性盖板均匀传递至砂

,水

,试

1 

Fig. 1  Equipment of pullout test

1. 2 

   

,基

. 2

,格

1.

,通

,通

,试

2.

2 

Fig. 2  Comparison of aperture shapes of geogrids

1 

Tab. 1  Physical and mechanical properties of geogrids

/ mm

向纵

向对

向纵

向对

/ mm

向纵

向对

/ mm

/ mm

kN

·

m - 1

0° 60° 90°

40

40

1. 5 1. 7 1. 1 1. 3

2. 1

24. 80 16. 40 16. 70

39 39

1. 7 1. 5

2. 0 2. 0

4. 8

25. 06

25. 57

2 

Tab. 2  Physical and mechanical properties of sand

/ mm

< 0. 25%

< 0. 41%

< 0. 48%

/ kPa

°

10 30 60 0. 993 5 0. 609 9 1. 92 1. 40 8. 78 37. 9

1. 3 

   

,控

90% .

,不

,在

(3)

西

 

 

 

 

 

 

 

52

,并

,试

,与

节点相连肋条未能与夹具完全接

,故

10

20

30

40 kPa

,各

拉拔试验速率设置

1 mm / min

,试验每

2 min

进行位移读数

,且当拉拔位移达到

20 mm

TX_0

TX_90

SS

3 

Fig. 3  Layout of measuring points of pullout samples

2 

2. 1 

    Dong

14

土工格栅不同方向的拉

,故

,双

献[

15

]的

0°

90°

,限

. 0°

时(图

)),节

,并

现象

,部分肋条脱离节点破坏

. 60°

90°

(如

)与

))方

,节

,最

,部

,三

60°

90°

,下

0°

0°

90°

,并

SS

TX_0

TX_90.

0 a !" #$

0°

60°

90°

4 

Fig. 4  Tensile damage of the triaxial geogrids

2. 2 

   

的增大而增加

如图

)所示

:法向压力为

10 kPa

SS

阻力大于

TX _0

;法向压

20 kPa

30 kPa

TX_0

SS

,且

;法

40 kPa

TX_0

SS

,且

SS

TX_90

(图

)),因

、肋

,其

,因

(4)

,等

:不

SS

SS

. TX

SS

,在

SS

TX

,承

,格

;而

,工

TX_0

TX_90

SS

,当

40 kPa

,工

TX_90

,因

                      





   



   



                      





   



   





)工

TX_0

SS

)工

TX_90

SS

5 

Fig. 5  Comparison of pullout resistance

   

TX

SS

、残

线

,图

)可

,法

10 kPa

TX_0

SS

,但

,与

SS

TX_0

)可

,各

,工

TX_

90

SS

:当

TX_0

SS

;各

,但

TX_0

SS

,即

TX_0

SS

;而

TX_90

TX_0

SS.

                    



 



   



    



 



    





   

                     



 



  



    



  



    





   



)工

TX_0

SS

)工

TX_90

SS

6 

Fig. 6  Comparison of shear stress

   

2. 3 

   

. Moraci

,而

,各

此同时

,在相同法向压力条件下

,工况

TX

SS

土界面表观摩擦系数

另外

,值得注意的

,当

10 kPa

,工

TX_0

(5)

西

 

 

 

 

 

 

 

52

TX_90

;而

能是

:低法向压力条件下

,工况

TX _0

TX_90

;而

,上

,三

SS

,导

,格

              























              



 





















)工

TX_0

SS

)工

TX_90

SS

7 

Fig. 7  Comparison of interface apparent friction coefficient

   

2. 4 

   

、界

,不

,下

TX_0

SS

)所

,工

TX_0

,达

,随

,拉

)所

SS

拉伸应变随拉拔位移增大而增

,且

TX

,而

SS

,并

,拉

、肋

,而

,拉

TX

SS

TX

,拉

,导

              



 



                  



 





)工

TX_0

)工

SS

8 

Fig. 8  Rib strain between clamp and point 1

   

TX

SS

,如

,当

40 kPa

,随

SS

,且

. TX_0

SS

(6)

,等

:不

,但

TX_0

,且

10

)为

TX_0

10

)可

,工

TX_0

线

条在

形区域外发生不同程度的挠曲变

,尤

,故

,夹

,格

. SS

,因

TX_90

TX_0

,不

,但

TX_90

线

,试

线

,且

线

. TX_90

40 kPa

10

)所

)工

TX_0

)工

SS

9  TX_0

SS

Fig. 9  Comparison of rib strain between cases TX_0 and SS

)工

TX_0

)工

TX_90

10  TX_0

TX_90

Fig. 10  Comparison of rib deformation between cases TX_0 and TX_90

3 

 

   

,通

、筋

,研

,并

)当

,三

,加

)三

,砂

,砂

)对

,格

,三

、对

线

,而

 

,苏

,张

,等

的确定方法[

西南交通大学学报

2015

50

):

156160. JIANG Wei

SU Qian

ZHANG Xiaoxi

et al. determination method of slip surface of reinforced soil slope subjected to seismic load

. Journal of Southwest Jiaotong University

2015

50

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156160.

 

,翁

,蔻

,等

学特性[

西南交通大学学报

2012

47

):

394399. YAN Xiangcheng

WENG Xingzhong

KOU Yanan

et al. Bending mechanical properties of cement concrete with fiber grid reinforcement

. Journal of Southwest Jiaotong University

2012

47

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394399.

 

,蔡

、格

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176180. SU Qian

CAI Ying. Geogridand Geocellreinforced sand blanket

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. Journal of Southwest Jiaotong University

2001

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(中

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