论文部分内容阅读
西部地区河床深厚覆盖层勘探取样及工程特性是水电工程地质勘察中常遇技术难题,动力触探(dynamic penetration test,DPT)因操作简单、适用土类多而成为西部地区河床覆盖层原位测试首选方法.现行规范仅给出了20m杆长范围的修正方法,但对超此范围重型、超重型动力触探杆长适用性及修正问题,长期以来业内则颇多争议却少有研究.鉴于此,利用现场试验与数值模拟相结合,通过对动力触探试验杆上各测点应变现场实测并得到各测点应力分布,再利用LS-DYNA软件进行反演分析并确定相关计算参数,而后进行杆长25m、40m、60m、80m、120m的数值模拟计算得到了杆长适用范围及修正系数.试验研究方法及成果可供类似问题研究与深厚覆盖层地区工程勘察借鉴或参考.
The exploration sampling and engineering characteristics of deep overburden beds in western China are often encountered in geological prospecting of hydropower projects. Dynamic penetration test (DPT) is the first choice for in situ testing of riverbed overburden in the western China because of its simple operation and large amount of soil available The current specification only gives a correction for the 20m rod length, but there has been little research into the long applicability and correction of this type of heavy and overweight PT rod, , By means of field test and numerical simulation, the strain field of each test point on the power probe was measured and the stress distribution of each measuring point was obtained. Then LS-DYNA software was used to conduct inversion analysis and determine the relevant calculation parameters before proceeding Rod length 25m, 40m, 60m, 80m, 120m numerical simulation calculation of the rod length scope and correction factor.Experimental research methods and results for similar problems with deep overburden area engineering exploration reference or reference.