寒旱环境盐生植物根系固土护坡力学效应及其最优含根量探讨

doi:10.13722/j.cnki.jrme.2014.1278

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Abstract In this research，Da Qaidam salt lake region and the surrounding areas was taken as the experimental area. Tension tests of single roots as well as shear strength test of the root-soil composite system of the four dominant halophytes(Leymus secalinus Tzvel.，Leymus paboanus Claus.，Carex enervis C. A. Mey. and Triglochin maritima Linn) were performed. The maximum tensile resistance and the corresponding tensile strength for the 4 species have been determined. In addition，a study on how roots increase the shear strength of soil and the optimal root content through the direct shear test for root-soil composite system for four halophytes was also carried out. The results of single root tensile test shows that the single root tensile resistance for four halophytes is 4.67～10.97 N，the single root tensile strength for four halophytes is 12.32～49.99MPa，meanwhile，the descending order of the tensile strength for the 4 halophytes is Leymus secalinus Tzvel.＞Leymus paboanus Claus.＞Carex enervis C. A. Mey.＞Triglochin maritima Linn.. The direct shear test shows that the cohesion force of the root-soil composite system for the disturbed samples of the four halophytes ranges in 10.44～27.42 kPa and that of soil without root is 8.10 kPa. Compared with soil without roots，the cohesion force of four root-soil composite system increase by 2.34～19.32 kPa and with an increase percentage of 28.89%～238.52%；roots can improve the shear strength of soil and there’s an optimal root content with which the shear strength can reach the peak value，and with the optimal root content，the corresponding cohesion force of the root-soil composite system for the 4 halophytes ranges in 17.94～27.42 kPa and the descending order is Triglochin maritima＞Leymus secalinus＞Leymus paboanus＞Carex enervis. The study has a theoretical and practical significance for Da Qaidam salt lake area and other areas having the similar geological condition in increasing shear strength by roots of halophytes，and meanwhile the study is conducive in the control of geological hazards，like water loss and soil erosion.

Key words： cold and arid environment Da Qaidam salt lake area roots of halophytes mechanical strength of single roots root-soil composite system mechanical effects the optimal root content

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1278 OR http://www.rockmech.org/EN/Y2015/V34/I07/9

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