Abstract: According to the filler characteristics of filling-stone subgrade of highway in mountainous area, the microscopic parameters of field fillers were determined by using a combination method of laboratory test and numerical simulation. Discrete element software was used to simulate the vibration compaction, and the impact of various rolling parameters on subgrade compaction was investigated. The rapid detection method suitable for the compaction quality of filling-stone subgrade in mountainous areas was explored by combing with the water filling method test results. The results show that in the vibration compaction process of filling-stone subgrade, the force chain system between particles is a dynamic process of continual breaking and re-establishment, and the entire subgrade structure is formed by the contact between large particle size aggregate particles to form a strong chain. It is recommended to use a compaction parameter combination with a vibration frequency of 28 Hz, excitation force of 400 kN, and amplitude of 1.0 mm, which has better compaction efficiency and quality. It is found that there is a negative correlation between the compactness and penetration of heavy dynamic penetration test of large particle size filling-stone subgrade in mountainous areas, and the heavy dynamic penetration test can be used as a rapid detection technology for the compactness detection of large particle size filling-stone subgrade. Sensors embedded in the filling-stone subgrade provide long-term monitoring and perception of its service performance. The results show that the subgrade settlement rate is around 0.5 mm per day, with no uneven settlement. The soil pressure peaks around 70 days after construction and remains stable, and the maximum horizontal displacement of the slope is 7 mm. During the monitoring period, all monitoring indicators dont reach the set warning values, which verifies the effectiveness and reliability of the proposed rolling parameter combination and compaction quality control technology of heavy dynamic penetration test suitable for filling-stone subgrade of mountainous expressway.

Key words: highway engineering; filling-stone subgrade; discrete element; vibration compaction; dynamic penetration test; intelligent perception

摘要： 根据山区高速公路填石路基的填料特性，采用室内试验和数值模拟相结合的方法确定现场填料细观参数，通过离散元软件进行振动压实模拟，分析各碾压参数对路基压实的影响效应，结合灌水法测试结果探究适用于山区填石路基压实质量的快速检测方法。结果表明：填石路基在振动压实过程中颗粒间力链体系是一个不断打破又重新建立的动态过程，整个路基结构由大粒径骨料颗粒间的接触形成强力链；建议采用振动频率28 Hz、激振力400 kN、振幅1.0 mm的碾压参数组合，该组合下压实效率和质量较优；得出山区大粒径填料填石路基密实度与重型动力触探的贯入度呈负相关关系，重型动力触探可作为快速检测技术用于大粒径填石路基的压实度检测；通过在填石路基内部埋设传感器的方法对其服役性能进行长期监测和感知，结果表明：路基沉降速率约为0.5 mm/d，未出现不均匀沉降；土压力在工后70 d左右达到峰值并处于稳定状态；边坡水平位移最大值为7 mm；各监测指标在监测期内均未达到设置预警值，验证了提出的适用于山区高速公路填石路基碾压参数组合和重型动力触探压实质量控制技术有效、可靠。

关键词: 道路工程；填石路基；离散元；振动压实；动力触探；智能感知