棕榈加筋上海黏土强度特性试验研究

采用棕榈作为加筋材料对上海黏土进行直剪慢剪试验，通过改变筋材的加筋率及尺寸研究棕榈对上海黏土强度特性的影响。试验表明，（1）与素土相比，加筋土的抗剪强度和黏聚力明显提高，但内摩擦角的变化较小；（2）加筋土的最优加筋率为0.6%；（3）棕榈尺寸为6 mm×12 mm的抗剪强度优于6 mm×6 mm和6 mm×18 mm的抗剪强度；（4）垂直压力为100 kPa时，应力-应变曲线呈应变软化型，随着垂直压力的增加，应力-应变曲线呈应变硬化型；（5）与素土相比，加筋土残余强度降低幅度减小，土体的抗变形能力提高，同时分析了加筋的抗剪强度作用机制，阐述了棕榈加筋材料在黏土中的作用，棕榈可作为加固上海黏土的一种有效方法。

Strength experimental study of palm reinforced Shanghai clay

Adopting palm as a reinforcement material for Shanghai clay, the direct shear tests are carried out to study the effect of palm on Shanghai clay strength characteristics by changing the reinforcement ratio and palm size of reinforcing material. The results show that: (1) Compared with the pure soil, the reinforced soil shear strength and cohesion have improved significantly, but small changes in the angle of internal friction. (2) The optimal rate of reinforcement is 0.6%. (3) The shear strength of shanghai clay with palm size of 6 mm×12 mm is higher than that with palm size of 6 mm×6 mm and 6 mm×18 mm. (4) When the vertical load is 100 kPa, the stress-strain curve is of strain softening type; with the vertical load increasing, the stress-strain curve is of strain hardening type. (5) Compared with pure soil, the reduction of residual strength of reinforced soil is reduced; and its resistance deformation enhance. At the same time, the reinforcement mechanism of the clay shearing strength and the effect of the palm in the clay are expounded. Therefore, the palm can be used as an effective method for reinforcing Shanghai clay.