(1. College of Water Resources and Electric Power，Qinghai University，Xining，Qinghai 810016，China；2. Department of Geological Engineering，Qinghai University，Xining，Qinghai 810016，China；3. Qinghai Institute of Salt Lakes，Chinese Academy of Sciences，Xining，Qinghai 810008，China；4. Northwest Plateau Institute of Biology，Chinese Academy of Sciences，Xining，Qinghai 810008，China)
Abstract：To study the relationship between shrub roots and soil friction，the shrub Caragana korshinskii is planted on the slopes of the test area in Xining basin and the test is carried out on the roots when Caragana korshinskii grew for sixteen months. The pull-out friction test for Caragana korshinskii roots are carried out by speed rate 2.67 mm/min in the vertical pressures 1.22，24.39，36.59，51.22 kN. The test results show that the root-soil friction grew with displacement of roots increasing in the soil；relationship curve between root-soil friction and displacement represents a linear relation in the initial stage of test，then represents an obvious non-linear relation with the development of the experiment；with the displacement of roots increasing in the soil，root-soil friction obviously increases，and a given degree increases；when the friction increases to a certain degree，it arrives at its peak and keeps constant，showing that at this time root-soil friction reaches to the largest and keeps balance with pull-out，with displacement of roots increasing in the soil，root-soil friction gradually decreases to a given degree，then to a steady state and a new balance. The test results also show that the root-soil friction obviously increases with the increasing vertical pressure，representing a linear relation，at the same time，the root-soil friction gradually decreases with soil moisture content increasing，representing an approximate linear relation in this experimental investigation. It is useful to further discuss the mechanism of roots reinforcement and anchorage that increase soil strength of slopes，and meanwhile，it is of theoretical significance and practice value in preventing the geological hazards that happen in shallow soil of the slopes.
张兴玲1，胡夏嵩2，3，毛小青1，朱海丽2，李国荣2，陈桂琛4. 青藏高原东北部黄土区护坡灌木柠条锦鸡儿根系拉拔摩擦试验研究[J]. 岩石力学与工程学报, 2011, 30(S2): 3739-3745.
ZHANG Xingling1，HU Xiasong2，3，MAO Xiaoqing1，ZHU Haili2，LI Guorong2，CHEN Guichen4. RESEARCH ON PULL-OUT FRICTION TEST OF SHRUB CARAGANA KORSHINSKII ROOTS FOR SLOPE PROTECTION IN LOESS
AREA OF NORTHEAST QINGHAI—TIBETAN PLATEAU. , 2011, 30(S2): 3739-3745.
周德培，张俊云. 植被护坡工程技术[M]. 北京：人民交通出版社，2003.(ZHOU Depei，ZHANG Junyun. Bio-geotechnical technology of vegetation[M]. Beijing：China Communications Press，2003.(in Chinese))
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2011, Vol. 30 
