多年冻土区公路路侧积水入渗规律与成灾机制研究

It has become a problem demanding prompt solution of road maintenance in permafrost area that extensive distribution of water by the side of the road caused a large number of roadbed problems. Based on the Qinghai-Tibet Highway, the project conduct a systematic study from three levels: infiltration rules of seeper by the highway side in permafrost regions, mechanisms of occurrence of roadbed disease caused by the region rich in water and influencing factor of hazard caused by seeper. The main research content include analysis of the survey result of roadside seeper in the Qinghai-Tibet highway, drilling test and observation of the typical cross-section of the Qinghai-Tibet Highway in permafrost regions, determination of and permeability coefficient of typical undisturbed and remolded soil. Will build of roadside ponding Moisture and temperature field coupling model of frozen soil roadbed considering multiple influence factors and carry out three field numerical simulation contains moisture field, temperature field and mechanical field. the impact of the frozen layer under the function of freeze-thaw cycle on the roadbed stability and model test of disaster mechanism and so on. Research results of this project, which provide scientific and technological support for water proofing and drainage design of road in this kind of place, hazard control and maintenance, are of great academic value and engineering significance for revelation of infiltration rules of water by the side of the highway in permafrost regions, prevention and mitigation of disaster.

路侧积水的广泛分布导致大量路基病害发生已成为多年冻土区公路养护亟待解决的问题，本项目将以青藏公路为依托，从多年冻土区公路路侧积水入渗规律、路内富（饱）水区域致路基病害发生机制、路侧积水致灾的影响因素三个层面展开系统研究。主要研究内容包括青藏公路路侧积水调查结果分析，青藏公路多年冻土区典型断面钻探测试与观测，对典型原状土和重塑土进行渗水和渗气系数的测定；建立考虑多因素影响的路侧积水入渗水热两场耦合模型并开展冻土路基水热力三场耦合数值模拟；冻融循环作用下冻结层上水对路基稳定性影响及病害成灾机制模型试验等。项目研究成果对于揭示多年冻土区公路路侧积水入渗规律与防灾减灾，为该类地区道路防排水设计、病害治理及养护提供科技支撑，具有重要的学术价值和工程意义。

路侧积水的广泛分布导致大量路基病害发生已成为多年冻土区公路养护亟待解决的问题，本项目将以青藏公路为依托，从多年冻土区公路路侧积水入渗规律、路内富（饱）水区域致路基病害发生机制、路侧积水致灾的影响因素三个层面展开系统研究。主要研究内容包括青藏公路路侧积水调查结果分析，青藏公路多年冻土区典型断面钻探测试与观测，对典型原状土和重塑土进行渗水和渗气系数的测定；耦合温度场对冻土路基边坡稳定性进行计算评价；冻融循环作用下冻结层上水对路基稳定性影响及病害成灾机制模型试验等。提出路侧积水对冻土路基存在强烈的热侵蚀作用，导致其人为上限严重下降，同时水分入渗路内在坡脚处形成富水饱水区域造成坡脚的软化是冻土路基融沉和纵向裂缝病害发生的根本原因。项目研究成果对于揭示多年冻土区公路路侧积水入渗规律与防灾减灾，为该类地区道路防排水设计、病害治理及养护提供科技支撑，具有重要的学术价值和工程意义。