摘要
为提升低黏聚性土的力学性质,采用磷石膏-玄武岩纤维作为复合固化材料,设置磷石膏掺量、玄武岩纤维掺量、含水率、压实度4 因素的正交试验,研究不同组合下固化土的黏聚力、压缩性及渗透性的变化规律,并通过熵值法筛选出最优组合.试验结果表明:极差分析显示含水率对固化土的抗剪强度、压缩性及渗透性影响程度最大,压实度对固化土渗透性影响显著;磷石膏掺量和玄武岩纤维掺量的增加有利于固化土的抗剪强度提高.通过熵值法确定磷石膏掺量、玄武岩纤维掺量、含水率、压实度分别为6.5%、0.8%、12%、98%时为最优组合,此时处理后的低黏聚性土黏聚力为75.9 kPa,压缩系数为0.17 MPa-1,渗透系数为1.43×10-5 cm/s.
Abstract
In order to enhance the mechanical properties of low cohesive soil,phosphogypsum-basalt fiber was em-ployed as the composite solidifying material.An orthogonal test was constructed with four factors:phosphogypsum dos-age,basalt fiber dosage,water content,and compaction degree.An orthogonal test analysis was conducted to investi-gate the impact of varying combinations on the changing rules of cohesion,compressibility,and permeability of the so-lidified soil.The optimal combinations were identified through the use of the entropy method.The results of the ex-treme difference analysis indicate that the water content exerts the most significant influence on the shear strength,compressibility,and permeability of solidified soil,while the compaction degree primarily affects the permeability.Furthermore,an increase in phosphogypsum dosage and basalt fiber dosage is conducive to an improvement in the shear strength of the soil body.The optimal combination was determined through the entropy method,which identified phos-phogypsum dosage,basalt fiber dosage,and water content,and compaction degree as 6.5%,0.8%,12%and 98%,respectively.This combination yielded the optimal performance of the treated low-viscous cohesive soil,which exhibi-ted a cohesion of 75.9 kPa,a compression coefficient of 0.17 MPa-1,and a permeability coefficient of 1.43×10-5 cm/s.
维普
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