矿渣微粉改良黄土力学性能及抗剪强度预测模型  

Mechanical Properties and Shear Strength Prediction Model of Slag Micronized Improved Loess

作　　者：杨国辉 李驰[1] 商艳 高瑜[1] 李拴虎 YANG Guo-hui;LI Chi;SHANG Yan;GAO Yu;LI Shuan-hu(College of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010000,China;Department of Civil Engineering,Erdos Institute of Applied Technology,Erdos 017000,China)

机构地区：[1]内蒙古工业大学土木学院,呼和浩特010000 [2]鄂尔多斯应用技术学院土木工程系,鄂尔多斯017000

出　　处：《科学技术与工程》2023年第3期1185-1191,共7页Science Technology and Engineering

基　　金：内蒙古自治区关键技术攻关计划(2021GG0344);内蒙古自治区科技重大专项(2020ZD0021)。

摘　　要：为探究矿渣微粉改良黄土效果,通过配置不同掺量的矿渣微粉黄土,利用无侧限抗压强度、抗剪强度、湿陷性试验研究矿渣微粉改良黄土机理与可行性,并提出抗剪强度预测模型。研究结果表明,随矿渣微粉掺量增加,无侧限抗压强度呈先增大后降低趋势,矿渣微粉掺量为15%时达到最大;不同掺量的矿渣微粉黄土较素黄土湿陷系数分别下降92.1%、96.4%、98.0%、99.0%、97.7%;随养护周期增加,抗剪强度、内摩擦角、黏聚力均有明显提高;不同矿渣微粉掺量下黄土抗剪强度预测模型与实测值相对误差均小于8%,拟合度较高。研究结果可为矿渣微粉改良黄土提供参考依据。In order to investigate the effect of slag micronized powder on improving loess, the mechanism and feasibility of slag micronized powder on improving loess were investigated by using unconfined compressive strength, shear strength and wet sinkability tests with different doping amounts of slag micronized powder loess, and a shear strength prediction model was proposed. The results show that the unconfined compressive strength increased and then decreased with the increase of slag micronized powder, and reached the maximum at 15% of slag micronized powder. The wet sinkage coefficient of slag micronized powder loess decreased by 92.1%, 96.4%, 98.0%, 99.0% and 97.7% respectively compared with that of plain loess. The shear strength, internal friction angle and cohesion all increased significantly with the increase of maintenance period. The relative errors between the predicted model and the measured values of the loess shear strength under different slag micronutrient dosing were less than 8%, and the fit was good. The results of the study can provide a reference for the improvement of loess by slag micronized powder.

关 键 词：矿渣微粉 黄土 无侧限抗压强度 抗剪强度 湿陷系数 抗剪强度模型 

分 类 号：TU444[建筑科学—岩土工程]