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[1]WANG Yun-xiang,SUN Hai-long,LUO Long-zao,et al.Study on Characteristics of Root Shear of Broussonetia papyrifera L. on Rocky-steep Slope[J].Research of Soil and Water Conservation,2012,19(03):114-118.

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Study on Characteristics of Root Shear of Broussonetia papyrifera L. on Rocky-steep Slope

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 03 Page number: 114-118 Column: Public date: 2012-06-20

Title:: Study on Characteristics of Root Shear of Broussonetia papyrifera L. on Rocky-steep Slope

Author(s):: WANG Yun-xiang¹, SUN Hai-long², LUO Long-zao³, LI Shao-cai^2,4, LUO Shuang⁴, LU Di-qiu¹, LONG Feng⁴, LIU Chong⁴; 1. College of Water Resources&Hydropower, Sichuan University, Chengdu 610064, China;
2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610064, China;
3. Guizhou Institute of Soil and Fertilizer, Guiyang 550006, China;
4. School of Life Science, Sichuan University, Chengdu 610064, China

Keywords:: rocky-steep slope; shear strength; lateral order; shear force

CLC:: S714.7

DOI:: -

Abstract:: In order to investigate how Broussonetia papyrifera L. root shearing characteristics varied with root diameter,growth direction and lateral order, shearing forces of these samples were measured by an electronic universal testing machine. Relationships between growth direction, lateral order and shear characteristics were analyzed systematically. The results showed that both root amount and average diameter of downslope were larger than those of upslope, while the average length of upslope was larger than that of downslope. Force-displacement curves of roots with different orders, root diameters, growth directions had the similar shapes, shear force of the 1st-order was larger than the 2nd-order’s. Maximum shear force increased with increase of root diameter. Linear relationship between shear strength and diameter was observed, shear strengths decreased with increase of diameters. There were no significant differences of shear strength which were observed among the 1st-order, 2nd-order, 3rd-order laterals of downslope, although the rank was 1st-order>2nd-order>3rd-order; and no significant differences of shear strength between upslope and downslope were observed. Shear strength is key factor affecting the stability of slope. In all, downslope roots with the 1st-order and 2nd-order maintained the slope soil shearing properties.

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