泥质粉砂岩地层土压平衡盾构渣土改良技术

发布时间：2018-05-27 01:26

本文选题：泥质粉砂岩 + 土压平衡盾构　；参考：《铁道科学与工程学报》2017年09期

【摘要】：以南昌地铁1号线5标为工程依托,采用室内试验和现场验证对泥质粉砂岩地层土压平衡盾构渣土改良技术。通过坍落度试验得到泥质粉砂岩渣土最佳坍落度为17~20 cm,并对渣土改良进行分析及数学公式拟合,得到坍落度与含水率和泡沫比的函数关系式。依据黏度指数的要求,确定渣土改良参数的取值范围:含水率范围为19.2%~23.2%,泡沫比范围为14.2%~36.6%。基于室内试验得到的现场施工渣土改良参数:盾构施工每环管片注水量范围为6.5~9.9 m3,泡沫剂注入范围为26.0~67.0 L。考虑盾构施工时改良参数相互影响,提出渣土改良精细化控制措施。通过现场实施验证,不仅渣土改良参数得以稳定控制,改良剂用量减小了22.0%,而且掘进参数也明显降低,渣土改良精细化控制效果显著。
[Abstract]:Based on Nanchang Metro Line 5, laboratory test and field verification were used to improve the soil pressure balance shield residual soil in siltstone formation. Through slump test, the optimum slump of muddy siltstone residue is 17 ~ 20 cm. The function formula of slump, moisture content and foam ratio is obtained by analyzing the improvement of residual soil and fitting the mathematical formula. According to the requirement of viscosity index, the range of improvement parameters of residual soil is determined: the range of moisture content is 19.2and the range of foam ratio is 14.20.36.6. Based on the laboratory test, the improvement parameters of residual soil in field construction are as follows: the water injection rate per ring segment in shield tunneling is 6.59.9 m ~ 3, and the foam injection range is 26.0 ~ 67.0 L. Considering the mutual influence of the improved parameters during shield construction, the fine control measures for residual soil improvement are put forward. It is proved that not only the improvement parameters of residue soil can be controlled stably, the dosage of modifier is reduced by 22.0, but also the tunneling parameter is obviously reduced, and the fine control effect of residual soil improvement is remarkable.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51778837)
【分类号】：U455.43

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