U型钢板桩施工的滑坡动态勘察技术及数值模拟

The Dynamic Prospecting Technology and Numerical Simulation of Landslide Based on the Process of Construction of U Type Steel Sheet Pile

为节省边(滑)坡灾害的应急加固时间,提高边(滑)坡处置的效率和质量,针对边(滑)坡在勘察阶段提出了基于U型钢板桩施工的动态勘察技术,即在静压植桩机压入U型钢板桩的同时,利用与其配套的压入管理系统设备与软件对压桩数据进行监测和分析,从而反馈出地层强度等信息。数值模拟中,为了能利用工程中所得压桩阻力图谱来反推地层信息,归纳总结了不同土体在桩压入时的应力云图和压桩阻力规律。结果表明:压桩阻力规律与地层信息之间存在对应关系,据此可判断地层强度特征等信息,数值模拟也为后续的现场试验研究提供了依据。

The dynamic prospecting technology based on the construction of U type steel sheet pile is proposed to save the time of reinforcing disastrous landslide and to increase the efficiency and quality of landslide handling. U type steel sheet pile is pressed in by static pressure pile machine. Meanwhile the soil data when pile is pressed in is monitored and analysed by press-in management system and software, and reflects soil intensity information, etc. In numerical simulation, soil information can be ob-tained from stress curve of piling, the stress nephogram and pile pressing resistance law of different soil are summarized. The results indicate that there is corresponding relationship between pile pressing resistance law and layer information. The intensity character-istics of layers can be estimated based on the relationship. Numerical simulation provides reference for follow-up field tests.