大型压路机压实对大厚度路基的实场试验评价

IF 3.3 3区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Journal of Zhejiang University-SCIENCE A Pub Date : 2022-11-01 DOI:10.1631/jzus.A2200201
Shu-jian Wang, Hongxiu Jiang, Zongjin Wang, Yu-jie Wang, Yi-xin Li, Xueyong Geng, Xinyuan Wang, Kai Wang, Yi-yi Liu, Yanxia Gong
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Results showed that dynamic soil stresses caused by the heavy vibratory rollers were 2.4–5.9 times larger than those of traditional rollers, especially at deeper depths, which were large enough to densify the soils to the full depth. A unified empirical formula was proposed to determine the vertical distribution of dynamic soil stresses caused by roller excitation. It was demonstrated that soils were effectively compacted in a uniform fashion with respect to the full depth to 96.0%–97.2% and 94.1%–95.4% for the large-thickness layers of 65 cm and 80 cm within 6 or 7 passes, respectively. Empirically, linear formulae were finally established between soil compaction degree and the subgrade reaction modulus, dynamic modulus of deformation, dynamic deflection, and relative difference of settlement to conveniently evaluate the compaction qualities. 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引用次数: 1

摘要

由于降水、土壤短缺和环境保护等原因,路基施工经常中断。因此,需要增加厚度层,以降低建设成本,并使高速公路早日投入使用。本文介绍了用重型振动压路机对65 cm和80 cm厚砾石路基进行压实质量评价的一系列全尺寸现场试验。提出了一种改进的砂锥法,并对其进行了标定,以研究土壤压实度在整个路基深度上的分布。结果表明,重型振动压路机所产生的动土应力是传统压路机的2.4 ~ 5.9倍,特别是在较深的深度,足以使土体密实到全深度。提出了一种统一的经验公式来确定滚轮激励下土体动应力的垂直分布。结果表明,65 cm和80 cm大厚度层在6道和7道内的有效压实率分别为96.0% ~ 97.2%和94.1% ~ 95.4%。最后在经验上建立了土体压实程度与路基反力模量、动变形模量、动挠度、沉降相对差值之间的线性关系式,便于对压实质量进行评价。研究表明,采用重型压路机增加路基厚度,在保证路基整体质量的同时,可显著降低施工成本和时间负担。目的本文旨在通过65厘米和80厘米松铺厚度路基的全比尺现场试验,提出保障大厚度路基压实效果的施工工艺和评价方法,以提高路基填筑的施工效率,降低能耗和碳排放。创新点 1. 改进适用于大厚度路基压实度评价的灌砂法;2. 建立碾压轮载作用下的路基内部动态土压力计算修正方程;3. 提出大厚度路基压实施工工艺及验收指标与压实度的关联关系,对大厚度路基压实质量进行可靠快速评价。 方法 1. 采用改进的灌砂筒及其标定方法,对大厚度路基的压实度进行分层检测;2. 基于现场土压力分层监测,获得碾压机械作用下动态土压力沿路基深度的衰减规律;3. 通过对每一遍碾压后的压实度,沉降差,K30、动态回弹模量、动弯沉进行多点检测和分析,获得各物理力学指标随碾压遍数的变化规律及其相互关联关系。结论 1. 高能级压实下的65厘米和80厘米松铺厚度路基动土压力可达0.19∼1.18 MPa和0.079∼1.19 MPa,可采用修正后的布西涅斯克方程表达;2。路基压实效果与应力水平和土层下部支撑密切相关,底层土体压实度提升前上层土体难以致密化;3. 高能级碾压机械可保证大厚度路基全深度有效压实,且动弯沉作为大厚度路基压实质量评价指标更为可靠。
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Evaluation of heavy roller compaction on a large-thickness layer of subgrade with full-scale field experiments
Subgrade construction is frequently interrupted due to precipitation, soil shortage, and environmental protection. Therefore, increasing the thickness layer is required to reduce construction costs and to allow highways to be placed into service earlier. This paper presents a series of full-scale field experiments evaluating the compaction quality of gravel subgrade with large-thickness layers of 65 cm and 80 cm using heavy vibratory rollers. An improved sand cone method was first proposed and calibrated to investigate the distribution of soil compaction degree across the full subgrade depth. Results showed that dynamic soil stresses caused by the heavy vibratory rollers were 2.4–5.9 times larger than those of traditional rollers, especially at deeper depths, which were large enough to densify the soils to the full depth. A unified empirical formula was proposed to determine the vertical distribution of dynamic soil stresses caused by roller excitation. It was demonstrated that soils were effectively compacted in a uniform fashion with respect to the full depth to 96.0%–97.2% and 94.1%–95.4% for the large-thickness layers of 65 cm and 80 cm within 6 or 7 passes, respectively. Empirically, linear formulae were finally established between soil compaction degree and the subgrade reaction modulus, dynamic modulus of deformation, dynamic deflection, and relative difference of settlement to conveniently evaluate the compaction qualities. It is demonstrated that increasing the thickness layer by means of heavy rollers can significantly reduce the cost and time burdens involved in construction while ensuring overall subgrade quality. 目的 本文旨在通过65 cm和80 cm松铺厚度路基的全比尺现场试验,提出保障大厚度路基压实效果的施工工艺和评价方法,以提高路基填筑的施工效率、降低能耗和碳排放。 创新点 1. 改进适用于大厚度路基压实度评价的灌砂法;2. 建立碾压轮载作用下的路基内部动态土压力计算修正方程;3. 提出大厚度路基压实施工工艺及验收指标与压实度的关联关系,对大厚度路基压实质量进行可靠快速评价。 方法 1. 采用改进的灌砂筒及其标定方法,对大厚度路基的压实度进行分层检测;2. 基于现场土压力分层监测,获得碾压机械作用下动态土压力沿路基深度的衰减规律;3. 通过对每一遍碾压后的压实度、沉降差、K30、动态回弹模量、动弯沉进行多点检测和分析,获得各物理力学指标随碾压遍数的变化规律及其相互关联关系。 结论 1. 高能级压实下的65 cm和80 cm松铺厚度路基动土压力可达0.19∼1.18 MPa和0.079∼1.19 MPa,可采用修正后的Boussinesq方程表达;2. 路基压实效果与应力水平和土层下部支撑密切相关,底层土体压实度提升前上层土体难以致密化;3. 高能级碾压机械可保证大厚度路基全深度有效压实,且动弯沉作为大厚度路基压实质量评价指标更为可靠。
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来源期刊
Journal of Zhejiang University-SCIENCE A
Journal of Zhejiang University-SCIENCE A 工程技术-工程:综合
CiteScore
5.60
自引率
12.50%
发文量
2964
审稿时长
2.9 months
期刊介绍: Journal of Zhejiang University SCIENCE A covers research in Applied Physics, Mechanical and Civil Engineering, Environmental Science and Energy, Materials Science and Chemical Engineering, etc.
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