软土地区盾构施工沉降界限

结合杭州地铁二号线实测沉降,采用“vi速度法”及“拟合直线法”分析不排水瞬时沉降与排水固结沉降的时间界限.分析发现,在地表无隆起的情况下,可以将地表变形分成3个阶段,其中瞬时沉降及固结沉降可以分别拟合为斜率不同的直线,前者斜率大于后者.在盾构脱开管片8.5～9 d后,地层进入排水固结阶段. 在同步注浆导致地表隆起的情况下,地层受到二次扰动,可以将地表变形分为5个阶段,在盾尾脱开管片10.5～12 d后,地层进入排水固结阶段．

Real-time license character recognition technology based on R-ELM

A new real-time recognition technology was provided for license plate character. Character image segmentation was normalized to a fixed pixel size after gray processing, and then R-ELM algorithm for training was applied. The desired recognition accuracy was rapidly achieved by using comparatively smaller sample sets. Experimental results show that recognition efficiency can be improved from 100 to 1000 times compared with the traditional BP algorithm. To apply the GPU technology more effectively, the system assembles the character data into packets by using elastic queue and dynamic compliance adjustment method which can acquire maximum efficiency in the recognition process. Experiments indicated that recognition accuracy was raised nearly 100 times compared with CPU. By testing of a large number of practical sample images, the method can obtain a good recognition and accelerated result．