期刊论文

Deterioration mechanism and rapid detection of performances of an existing subgrade in southern China

Zheng, Jian-long

英文

中南大学学报(英文版)

2095-2899

2020

27

7

2134-2147

10.1007/s11771-020-4436-5

Foundation item : Project(2017YFC0805307) supported by the National Key Research and Development Program of China; Projects(51878078, 51927814, 51911530215) supported by the National Natural Science Foundation of China; Project(2018-025) supported by the Training Program for High-level Technical Personnel in Transportation Industry, China; Project (2018JJ1026) supported by the Excellent Youth Foundation of Natural Science Foundation of Hunan Province, China; Project(17A008) supported by the Key Project of Education Department of Hunan Province, China; Projects(kfj150103, kfj170104) supported by the Open Research Fund of State Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, China; Project(CX20190644) supported by the Postgraduate Scientific Research Innovation Project of Hunan Province, China

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To relieve the increasing traffic load, many early built highways need to be widened or reconstructed. The rapid performance detection to existing subgrades is important to their reasonable evaluation and maximized utilization. Based on five kinds of soils taken from an existing highway in southern China, three commonly detecting methods were used to determine their moisture contents, compaction degrees and resilient moduli. The results showed that the measured moisture contents were greater than the design value, and the compaction degrees decreased sharply compared to the original ones. The ...

为了缓解日益增长的交通压力,许多早期修建的道路都需进行加宽。对既有路基的快速检测有助于准确评估其性能状态,实现其最大程度的利用。在华南地区的某一老路基试验段选取了五种土,采用3种常规检测方法,分别测定其含水量、压实度和弹性模量。结果表明,经过多年运营后,路基实测含水率大于设计值,实测压实度较设计值显著降低。路基和大气的水热交换使得其弹性模量从标准的60 MPa下降至40 MPa。随后,采用便携式落锤式弯沉仪(PFWD)和动力锥贯入仪(DCP)对路基进行性能检测。将PFWD模量和DCP贯入度与回弹模量、贝克曼梁弯沉、压实度和含水量进行了关联分析,证实这两种方法都适用于路基性能的快速检测...