提高上海粘土强度的加筋试验研究

Study on reinforcement test on improving strength of shanghai clay

为解决因大孔隙与高压缩引起土的强度降低问题,采用棕榈加筋上海粘土来提高其强度。选择棕榈加筋率、加筋尺寸作为影响因素,对其进行直剪慢剪、CBR及无侧限抗压强度的试验研究。试验结果表明:棕榈加筋土能够显著提高上海粘土抗剪强度、抗压强度及抗变形能力。最适宜的棕榈加筋尺寸为6 mm×12 mm。直剪慢剪试验的最佳加筋率为0.6%,CBR及无侧限抗压强度试验的最佳加筋率为0.8%。同时通过试验研究,分析加筋土强度变化的原因,掌握棕榈加筋对上海粘土影响的变化规律。

To solve the reducing problem of soil strength caused by large pores and high compression , the paper used palm to mix in shanghai clay to improve its strength ,and selected palm reinforcement rate ,re-inforcement size as influence factors and did direct slow shear test , CBR test and unconfined compressive strength test .The results showed that palm reinforced soil can significantly improve shanghai clay shear strength , compressive strength and resistance deformation ability .The optimum size of palm reinforcement is 6mm ×12mm.The best reinforcement rate of direct slow shear test is 0.6%.The best reinforcement rate of CBR and unconfined compressive strength test is 0.8%.At the same time, Through the analysis of change reasons of palm reinforced shanghai clay , the paper mastered the change rule of influence of palm reinforced shanghai clay .