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| Experimental study of the influence of grain size on the shear
strength of rooted soil |
| LI Yuezhou1，2，FU Jiangtao1，2，HU Xiasong1，3，YU Dongmei1，ZHU Haili1，2，HU Xiaotian1，2，LI Guangying1，2 |
| (1. Qinghai Institute of Salt Lakes，Chinese Academy of Sciences，Xining，Qinghai 810008，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Department of Geological Engineering，Qinghai University，
Xining，Qinghai 810016，China)
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Abstract To study the mechanical effect of slope protection by halophytes and to investigate the influence of grain size on the shear strength of the rooted soil，Qaidam Basin in Qinghai province was selected as the test site and 2 halophytes(Triglochin maritima Linn. and Carex enervis C.A.Mey) were selected for study. To investigate the contribution of halophytes to the shear strength of the rooted soil and the variation of shear strengths，undrained-unconsolidation triaxial compression tests were conducted on the rooted soil and non-rooted soil samples with the grain size d≤0.25 mm and d≤0.5 mm prepared by sieving and remolding. The results showed that halophytes played significant roles in soil reinforcement. The shear strengths of rooted soil for T. maritima and C. enervis were notably larger than those of non-rooted soil and the shear strength of the vertically rooted soil was larger than that of horizontally rooted soil. The grain size influenced the shear strength of the soil. Under the same root content，the rooted soil with smaller grain size had larger value in cohesion force. The horizontally rooted soil of C. enervis was notably influenced by the grain size than the vertically rooted soil of T. maritima in shear strength of the soil.
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2016, Vol. 35 
