一种路基动模量测试方法

为研究一种有效、合理的测定路基动模量的方法,在分析便携式地震波地质分析仪的工作原理和测试特点的基础上,根据弹性动力学和表面波谱分析理论,阐述了便携式地震波地质分析仪的测试原理,并推导了测试路基动模量计算公式。结合路基测试实际工作要求,提出了便携式地震波地质分析仪器的测试步骤及技术要点。通过在路基进行大量点点对应的便携式地震波地质分析仪、便携式落锤弯沉仪和承载板回弹模量测试以及动态圆锥贯入仪贯入测试和灌砂法压实度测试,建立了便携式地震波地质分析仪动模量与其他各指标之间的相关关系。结果表明,便携式地震波地质分析仪与其他检测方法具有很好的相关性,相关系数均大于0.8。结果表明,应用便携式地震波地质分析仪快速检测路基动模量是合理、可行的,可以用于路基施工过程的质量控制,为路面结构设计提供参数和依据。     

轻便机动惯性泵在CMT监测井采样中的应用研究

针对CMT监测井监测通道内径小引起的采样困难的问题,研究了一种新型的轻便机动惯性泵,并对轻便机动惯性泵的可靠性进行了分析,对电机转速、采样深度、通道内径和采样管规格对采样速度的影响进行了试验研究,为后续轻便机动惯性泵的改造奠定了基础,为小口径监测井采样提供了借鉴。     

便携式锂钾分析仪在钾盐资源现场勘查中的应用

钾盐矿作为农业三大肥料中钾肥的主要原料,是国家粮食安全的重要保障,也是我国紧缺的七大宗矿产资源之一.当前可供开发利用的主要是可溶性钾盐资源,现场勘探和开采急需相关仪器和快速分析技术的支持.项目组采用自主研发的便携式锂钾分析仪,在对钻探钾盐样品采用超声波技术进行消解的基础上,选择K的分析谱线波长为766.49 nm,建立...     

A back analysis scheme for refined soil stratification based on integrating borehole and CPT data

Utilizing both borehole and Cone Penetration Testing (CPT) data in soil stratification helps to get more convincing soil stratification results. However, the soil classification results revealed by borehole (Unified Soil Classification System, USCS) and CPT tests (soil behavior type, SBT) are commonly not consistent. This study proposes a feasible solution to integrate the borehole and CPT data with the tree-based method. The tree-based method is naturally suitable for soil stratification tasks as it aims to divide the subsurface space into several clusters based on the similarities of the soil types. A novel boundary dictionary method is proposed to enhance the model performance on complex soil layer conditions. A probabilistic mapping matrix between the USCS-SBT system is built based on a collected municipal database with collocated borehole and CPT data. The optimal soil stratification results can be selected based on considering multiple borehole information and pruning the structure of trees. The structure of the trees can be optimized in a back analysis perspective with the Sequential Model-Based Global Optimization (SMBO) algorithm which aims to maximize the possibility of observing the borehole information based on the USCS-SBT probabilistic mapping matrix. The uncertainties of the optimal soil stratification results can be estimated based on a weighted Gini index method. The performance of the proposed method is validated based on a real case in New Zealand with a cross-validation method. The results indicate that the proposed method is robust and effective.     

便携式近红外光谱矿物分析仪分光系统研制

自行研制了光机电一体化的便携式近红外光谱仪的分光系统,采用单光路光栅扫描机构,以单片机控制微型步进电动机驱动,正弦传动实现分光系统的线性波长扫描.仪器波长范围1300～2500 nm,光谱分辨率7 nm,波长准确性和重现性均小于2 nm,全谱扫描时间小于70 s,重量小于5 kg,体积为260 mm×190 mm×130 mm.