论文部分内容阅读
废轮胎应用于岩土工程不仅开辟了废轮胎处置的新途径,还为解决岩土工程问题提供了新型复合材料。为了更好地模拟实际回填土受力工况,采用不固结不排水三轴试验研究了掺量为10%～50%的废轮胎颗粒与黄土混合物(以下简称GR-LM,granulated rubber loess mixtures)的剪切特性,考察了掺量、围压对剪切强度的影响。对试验结果进行了机制探讨。研究表明,所有GR-LM试样均表现出应变硬化特点,纯废轮胎颗粒在试验所有围压范围内呈近似线性的偏应力-应变特性;GR-LM应力-应变特性与掺量和围压有关,低围压下存在剪切强度增大的掺量为30%,其GR-LM强度高于其他各掺量混合土并略高于纯压实黄土的剪切强度;GR-LM剪切强度机制与GR-LM孔隙填充状态、基质土物理状态、弹性骨架颗粒有关,总体上随骨架颗粒的不同接触关系而表现出粉土与粒状土的强度特性,在剪切强度特性上体现出掺量与围压作用的相互耦合,而与压实粉土或砂土有所不同。
The application of waste tires to geotechnical engineering not only opens up new ways for the disposal of waste tires, but also provides new composite materials for solving geotechnical problems. In order to better simulate the actual backfill loading conditions, the unconsolidated undrained triaxial test was conducted to study the mixture of waste tire pellets and loess with the content of 10% ~ 50% (hereinafter referred to as GR-LM, granulated rubber loess mixtures ) Shear characteristics of the amount of confining pressure on the impact of shear strength. The mechanism of the experiment is discussed. The results show that all the GR-LM specimens show the characteristics of strain hardening and the pure waste tire particles have approximate linear deviator stress-strain characteristics in all the confining pressures tested. GR-LM stress-strain characteristics, The GR-LM strength is higher than that of other mixed soil and slightly higher than pure compacted loess; GR-LM shear The strength mechanism is related to the pore filling state of GR-LM, the physical state of matrix soil, and elastic skeleton particles. Generally speaking, the strength characteristics of silt and granular soil are shown with the different contact relationship of framework particles. The amount of interaction with confining pressure is different from that of compacted silt or sand.