重型超重型动力触探锤击数修正系数外延研究

摘要

Exploratory sampling and in-situ test are the technical challenges frequently encountered in the geotechnical inves-tigation of hydropower projects in west China where the riverbed overburden is thick with complex genesis, loose structure and coarse particles. Based on a optimization algorithm that combines Levenberg-Marquardt algorithm and general global optimiza-tion, this paper studies the fitting of correction factors of heavy and extra heavy dynamic penetration in executing standard by a optimization software of First Optimization (1stOpt), and the correction factors fitting function as well as the extended correction coefficients of two-factor ( rod length and actual count ) of dynamic penetration are calculated, which was applied to Wudongde Hydropower Station on Jinsha River. The study expanded the application range of dynamic penetration in current standard and fa-cilitated the mass calculation and interpolation of measured data.%西部地区河床覆盖层深厚且成因杂、结构散、颗粒粗，勘探取样与原位测试是水电工程地质勘察中常遇的技术难题。利用麦夸特法与通用全局优化法相结合的优化算法，基于1stOpt数学优化分析软件，对现行规范中重型、超重型动力触探锤击数修正系数进行了拟合研究。给出了双因子(杆长、实测锤击数)动力触探锤击数修正系数拟合函数与外延修正系数，并应用于金沙江乌东德水电站。研究成果不仅扩展了动力触探应用范围，而且为测试数据批量化计算与查表内插处理提供了便利，可供河床深厚覆盖层地区水电工程勘察参考使用。