基于土工织物加固层的砂土力学特性研究

STUDY ON MECHANICAL PROPERTIES OF SAND SOIL BASED ON GEOTEXTILE REINFORCED LAYERS

土工合成材料被广泛应用于岩土工程、水利工程等众多领域,然而关于其加固机理问题却长期处于理论研究落后于实践应用的局面。为反映加固材料对砂土力学特性的影响,通过室内三轴试验,对普通砂土和土工织物加固砂土进行对比研究,初步揭示了土工合成材料对砂土力学参数的影响规律。加入土工织物提高了砂土的最大偏应力和抗剪强度,3层加固土体内摩擦角最大增加49%;加入土工织物减少砂土剪胀特征,并且这一现象随着应变的增加愈加明显;轴向应变小于1%时加固砂土表现出较高的割线模量,这种现象随着加固层数的增加而愈发明显。相关研究成果可为工程实际提供参考和理论支持。

Geo-synthetics have been widely used in geotechnical engineering,hydraulic engineering and many other fields.In order to reflect the effects of reinforcement materials on the mechanical properties of sand soil,this paper conducts a comparative study between ordinary sand soil and geotextile reinforced sand soil through the laboratory triaxial test,and preliminarily reveals the influence law of geosynthetic materials on the mechanical parameters of sand soil.The addition of geotextile increases the maximum deviant stress and shear strength of sandy soil,and the maximum internal friction angle increases by 49%.The addition of geotextile reduces the dilatation characteristics of sandy soil,and this phenomenon becomes more and more obvious with the increase of strain.When the axial strain is less than 1%,the strengthened sand shows a high secant modulus,which is obvious with the increase of the number of reinforcement layers.