加筋昔格达土三轴试验研究

Triaxial Test Study on Reinforced Xigeda Soil

目前国内外学者研究较多的是砂性土加筋后的工程性质。在四川攀枝花、西昌至云南北部地区广泛分布的昔格达土,属粉粘粒含量较高的砂性土,工程性质特殊,而对加筋昔格达土工程性质的研究却少有报道。介绍了以PP带为加筋材料,采用三轴固结排水剪切试验研究加筋昔格达土的应力应变关系,以及其加筋效益系数IR随加筋层数和围压力变化的一些规律,确定各加筋层数下复合土体的强度参数c、φ值。试验结果表明,加筋效益系数IR随加筋层数增加而增大,随围压力的增加而减小,c、φ值随加筋层数的增加而升高。

Engineering property of reinforced sandy soil is mostly studied by researchers in China and abroad .Xigeda soil is widely distributed in the region of Panzhihua and Xichang in Sichuan Province and northern part of Yunnan Province. The soil is a kind of sandy soil with high clay content and special engineering property .With reinforced material PP strips, consolidated-drained triaxial shear test is conducted to analyze stress and strain relationship of reinforced Xigeda soil ,variations of reinforced benefit coefficient IR with reinforced layers and confining pressure, determine strength parameters c,φ for composite earth under each reinforced layer. Test results indicate that reinforced benefit coefficient IR is higher with increased reinforced layers and lower with confining pressure rise. Values c and φ are larger with increased reinforced layers.