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[1]ZHAO Dan,YU Dongmei,HU Xiasong,et al.Study on Reinforcement Effect by Halophyte Roots in Increasing Soil Shear Strength[J].Research of Soil and Water Conservation,2017,24(04):259-265,273.

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Study on Reinforcement Effect by Halophyte Roots in Increasing Soil Shear Strength

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 04 Page number: 259-265,273 Column: Public date: 2017-08-28

Title:: Study on Reinforcement Effect by Halophyte Roots in Increasing Soil Shear Strength

Author(s):: ZHAO Dan^1,2, YU Dongmei¹, HU Xiasong^1,3, FU Jiangtao^1,2, LIU Yabin^1,2, QI Zhaoxin^1,2, ZHU Haili^1,2; 1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Key Laboratory of Salt Lake Geology and Environment of the Qinghai Province, Xining 810008, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Qinghai University, Xining 810016, China

Keywords:: Da Qaidam Salt Lake; halophytes root; rooted soil; increasing shear strength of soil

CLC:: P642.11⁺6

DOI:: -

Abstract:: Da Qaidam Salt Lake and its surrounding areas were selected as the test sites. And two predominant halophytes (Triglochin m aritimum L. Claus. and Phragmites australis (Cav.) Trin. ex Steud) were selected as the test samples. By direct shear tests on soil without root samples and rooted soil samples for the two halophytes, the influences of the roots of the two halophytes on increasing shear strength of soil were investigated. The test results show that the cohesion forces of rooted soil for the two halophytes were 13.48～21.87 kPa, and the cohesion force of soil without roots was 8.45 kPa. In contrast to soil without root, the increment in cohesion force of rooted soil was 5.03～13.42 kPa, with the corresponding incremental rate of 59.53%～158.82%. The cohesion force of rooted soil for T.maritimum was greater than that for P.australis. Moreover, the cohesion forces of rooted soil for the two halophytes were positively correlated with root content in some extent. And in some extent, the mechanism of roots for the two halophytes in increasing the shear strength of soil was exhibited in the following. To a certain extent, the increased amount of roots and root density meant the increased effect of roots in increasing shear strength of soil, and the contribution of root for T.matitimum in increasing shear strength is relatively greater than that for P.australis. The obtained conclusion has the theoretical value and practical significance in increasing shear strength by roots of halophytes for Da Qaidam Salt Lake area and other areas with the similar geological condition, and meanwhile, the conclusion is conducive in the control of geological hazards like water loss and shallow landslides.

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