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依托包钢新体系2 250mm热轧车间的地基处理工程对混合料的力学特性进行研究;借助大型直剪仪对不同围压和含水率的混合料进行直剪试验,分析了混合料在不同条件下的抗剪强度、力学参数以及从混合料剪切“翻滚-跳跃”现象的角度对相应的剪应力-剪切位移关系曲线上下波动情况进行分析;通过线性回归分析得到含水率与粘结力和内摩擦角的关系曲线。结果表明:当含水率相同时,随着法向应力的增加,混合料的抗剪强度峰值逐渐增大;相同法向应力作用下,随着含水率的增加,混合料的抗剪强度逐渐降低;随着含水率的增加,粘结力和内摩擦角逐渐降低,并且含水率的变化对粘结力的影响程度较内摩擦角大;当剪切位移处于试样长度的1/60～1/10时,剪切“翻滚-跳跃”现象最为明显,相应的剪应力-剪切位移曲线所出现的上下波动幅度也最大。
Based on the foundation treatment project of 2 250mm hot rolling plant in the new system of Baotou Steel, the mechanical properties of the mixture were studied. The direct shear tests were conducted on the mixture with different confining pressures and moisture contents by means of a large direct shear tester. The effects of different conditions Under the shear strength, mechanical parameters and from the mixture shear “roll - jump ” phenomenon analysis of the corresponding shear stress - shear displacement curve up and down; by linear regression analysis of moisture content and viscosity The relation between the force and internal friction angle. The results show that with the same moisture content, the shear strength of the mixture gradually increases with the increase of normal stress. With the increase of water content under the same normal stress, the shear strength of the mixture gradually decreases ; As the moisture content increases, the bond strength and internal friction angle gradually decrease, and the influence of the change of moisture content on the bond strength is larger than the internal friction angle; when the shear displacement is in the range of 1/60 to 1 / 10, the phenomenon of “roll-jump” is the most obvious, and the corresponding fluctuation of shear stress-shear displacement curve is also the largest.