石振明, 薛丹璇, 彭铭, 陈亿军. 2018: 泥水盾构隧道废弃泥浆改性固化及强度特性试验. 工程地质学报, 26(1): 103-111. DOI: 10.13544/j.cnki.jeg.2018.01.012
    引用本文: 石振明, 薛丹璇, 彭铭, 陈亿军. 2018: 泥水盾构隧道废弃泥浆改性固化及强度特性试验. 工程地质学报, 26(1): 103-111. DOI: 10.13544/j.cnki.jeg.2018.01.012
    SHI Zhenming, XUE Danxuan, PENG Ming, CHEN Yijun. 2018: EXPERIMENT ON MODIFIED-CURING AND STRENGTH PROPERTIES OF WASTE MUD FROM SLURRY SHIELD TUNNEL. JOURNAL OF ENGINEERING GEOLOGY, 26(1): 103-111. DOI: 10.13544/j.cnki.jeg.2018.01.012
    Citation: SHI Zhenming, XUE Danxuan, PENG Ming, CHEN Yijun. 2018: EXPERIMENT ON MODIFIED-CURING AND STRENGTH PROPERTIES OF WASTE MUD FROM SLURRY SHIELD TUNNEL. JOURNAL OF ENGINEERING GEOLOGY, 26(1): 103-111. DOI: 10.13544/j.cnki.jeg.2018.01.012

    泥水盾构隧道废弃泥浆改性固化及强度特性试验

    EXPERIMENT ON MODIFIED-CURING AND STRENGTH PROPERTIES OF WASTE MUD FROM SLURRY SHIELD TUNNEL

    • 摘要: 泥水盾构隧道施工产生大量的废弃泥浆,可能带来环境污染、侵占土地等问题,影响城市的正常运转。本文以厦门市某隧道施工现场产生的废弃泥浆为研究对象,采用化学固化技术处置泥浆,测试不同影响因素(固化剂种类、固化剂掺入比、泥浆初始含水率)对改性固化后泥浆抗压强度、pH值、含水率等特性的影响,分析固化机理并解释相关现象,获取最优固化剂种类、掺入比、泥浆初始含水率。对比试验结果表明最优固化剂种类为CERSM泥浆固化剂Ⅱ,掺入比为10%,泥浆初始含水率为100%。在此基础上,本文进一步探讨改性固化后泥浆的强度特性,28 d后固化泥浆抗压强度可达1.5 MPa,是普通水泥固化泥浆强度的4倍,可用做建筑填料,解决环境污染问题,并实现废弃泥浆的资源化利用。

       

      Abstract: Slurry shield tunnel construction produces a large amount of waste mud. If these engineering muds cannot be properly disposed, they probably bring environmental pollution, occupation of land and other issues, highly disturbing the normal operation of cities. The waste mud in this experiment is collected in the construction site of tunnel projects in Xiamen. In order to dispose the waste mud safely and effectively, chemical solidification technology is used to achieve the optimal curing effect through comparative tests. In these tests, different values of curing agent type, agent mixing ratio, and mud initial water content lead to different values of compressive strength, pH value, and water content of modified-curing mud samples. The optimum curing agent type, agent mixing ratio and initial water content of waste mud are obtained with the analysis of curing mechanism and related data. These tests are divided into 3 parts. The first part is curing agent types comparative test, which includes 425# ordinary Portland cement(S1), CERSM mud curing agent Ⅰ(C1), CERSM mud curing agent Ⅱ(C2) and quick lime(L1). The second part is curing agent mixing ratio comparative test, which includes 3%, 5%, 7%, 10%, 15% agent mixing ratio. The last part is mud initial water content comparative test, which includes 100%, 125%, 150%, 180% mud initial water content. Then the optimum curing agent type, mixing ratio and initial water content of slurry are obtained respectively by testing the effects of different factors(agent types, agent ratio and mud initial water content) on compressive strength, pH value, and water content of modified-curing mud samples. Based on the compressive strength, sample water content and pH value of the above three aspects, the curing effect of curing agent from high to low is ranked as CERSM mud curing agent Ⅱ(C2), 425# ordinary Portland cement(S1), CERSM mud curing agent Ⅰ(C1) and quick lime(L1) from highest to the lowest. Compressive strength increases with the increase of the curing agent ratio, sample water content decreases with the curing agent ratio increasing, and pH value increases with the increase of the curing agent ratio, decreases with age. Compressive strength decreases with the increase of mud initial water content, sample water content increases with the increase of mud initial water content, and the pH of the modified-curing mud sample has nothing to do with mud initial water content. In engineering, CERSM mud curing agent Ⅱ, 10% ratio, and 100% mud initial water content are finally chosen. The compressive strength of modified-curing mud sample after 28 d is up to 1.5 MPa, which is 4 times of the strength of ordinary cement solidified slurry sample. Moreover, as the growth of the age, the shear strength of modified-curing mud sample has a substantial increase, the cohesion of sample increases to 262 kPa, and internal friction angle increases to 38.65°, and modified-curing mud can be used as building filler. The presented technology can be used to dispose waste mud, which can not only solve the environmental pollution problem, but also help to realize the resource utilization of the waste mud.

       

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