纤维加筋水泥风积砂三轴压缩试验研究

Experimental study on triaxial compression test of fiber reinforced cement aeolian sand

为研究聚丙烯纤维加筋水泥风积砂的抗剪强度特性,采用正交试验方法进行不固结不排水三轴(UU)试验,研究纤维掺量、纤维长度、水泥掺量和含水率对纤维加筋水泥风积砂抗剪强度的影响。研究结果表明:对纤维加筋水泥风积砂抗剪强度影响的主次因素依次为水泥掺量、纤维长度、含水率、纤维掺量,最优试验配比为水泥掺量10%,纤维长度12 mm,含水率8%,纤维掺量0.2%。在水泥风积砂中掺入适量的纤维,可明显提高试样的峰值应力和峰值应变。黏聚力随纤维掺量的增加先增大后减少,随纤维长度的增加呈递增趋势,纤维掺量对内摩擦角的影响较小。研究结果可为纤维加筋水泥风积砂路基防治提供科学依据。

In order to study the shear strength characteristics of polypropylene fiber-reinforced cement aeolian sand,the orthogonal test method was used to conduct unconsolidated undrained triaxial(UU)test to study the effects of fiber content,fiber length,cement content,and water content on the shear strength of fiber-reinforced cement aeolian sand.The results show that the main and secondary factors influencing the shear strength of fiber-reinforced aeolite sand are cement content,fiber length,water content,and fiber content.The optimal test ratio is cement content 10%,fiber length 12 mm,water content 8%and fiber content 0.2%.The peak stress and strain of cement eolian sand can be significantly increased by adding the appropriate amount of fiber into the sample.The cohesion increases first and then decreases with the increase of fiber content,and increases with the increase of fiber length.The influence of fiber content on internal friction angle is small.The research results can provide the scientific basis for the prevention and treatment of fiber-reinforced cement eolian sand roadbeds.