THE EFFECTS OF WATER CONTENT AND GRAIN SIZE ON THE CLOGGING AND ABRASIVITY OF FINE-GRAINED SOILS IN MECHANIZED EXCAVATION

IF 1.2 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2023-01-01 DOI:10.17794/rgn.2023.2.4

Erfan Khoshzaher, H. Chakeri, M. Darbor, H. Shakeri

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引用次数: 1

Abstract

Clogging during excavation is one of the common problems in mechanized excavation. Among the influential factors in clogging of the cutter head, we can mention the percentage of fine soil particles (under 200 mesh sieve), soil moisture, and soil type. In this study, to investigate the mechanism of tunnel excavation in the laboratory, a tunnel excavation machine laboratory simulator was designed and built. The features of this device are its horizontal operation, the low rotation speed of the cutter head, continuous contact of the pins with fresh soil during the test, and the continuous injection of additives with a specific injection pressure during the test. The effect of the percentage of fine-grained, soil moisture and the foam injection ratio (FIR) on clogging, energy consumed, and the average wear of cutting tools was studied. The results showed that with an increase in the percentage of fine soil particles from 90 to 100%, the clogging of cutting tools increased by 50%. Also, with an increase of soil moisture from a dry state to moisture content of 5%, clogging of the cutter head is insignificant, and after that, with an increase of moisture from 10 to 25%, clogging is increased by 178%, and the amount of energy consumed in each test is increased by 84%. In addition, by increasing the foam injection ratio from 40 to 60%, clogging decreased by 81% on average, and the wear of cutting tools decreased by 62% on average.

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含水量和粒度对机械化开挖细粒土堵塞性和磨耗性的影响

开挖堵塞是机械化开挖中常见的问题之一。在刀盘堵塞的影响因素中，我们可以提到细土颗粒百分比(200目筛网以下)，土壤湿度和土壤类型。为了研究隧道在实验室开挖的机理，设计并搭建了隧道掘进机实验室模拟器。该装置的特点是水平运行，刀盘转速低，试验时销与新鲜土壤连续接触，试验时按特定注射压力连续注射添加剂。研究了细粒率、土壤水分和泡沫注入比(FIR)对刀具堵塞、能耗和平均磨损的影响。结果表明，当土壤细粒含量从90%增加到100%时，刀具堵塞率增加了50%。当土壤含水量从干燥状态增加到5%时，刀头堵塞现象不明显，此后，当土壤含水量从10%增加到25%时，刀头堵塞现象增加了178%，每次试验能耗增加了84%。此外，将泡沫注入比从40%提高到60%，堵塞平均降低81%，刀具磨损平均降低62%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Rudarsko-Geolosko-Naftni Zbornik Multiple-

CiteScore

2.50

自引率

15.40%

发文量

审稿时长

12 weeks