沉管桩施工与检测中某些技术问题的探讨

在含有大量生活垃圾形成的复杂软弱层中，按常规方法施工沉管桩，将造成严重的缩径现象。震动沉管施工规范中又未有特殊规定，笔者根据一大型工程实例，分析了造成严重的缩径现象的原因，提出在上部杂填土是由大量生活垃圾组成并夹有软质粘土、淤泥层时，应优先选用预制桩工艺；对于振动沉管应采用复打或多次反插工艺，并跳打；应禁止单独采用慢速拨管工艺。     

山前洪积扇地基岩土勘察和测试工作——以郑州发祥铝业建设工程为例

简述了洪积扇地形地貌、土层结构、水文地质、特殊性岩土等各种工程地质条件，划分了勘察阶段，明确了各阶段勘察目的和任务，并重点介绍了在详细勘察阶段优质、高效完成野外勘察和测试工作的成功经验，明确指出了洪积扇场地非常适合钻孔、探井、测井等勘察手段和动力触探等原位测试方法。     

软件工程中并发测试的研究与实践

随着计算机技术和Internet的发展，相对于以前的单机版的应用软件，目前已有众多的网络版应用软件犹如雨后春笋，不断的涌现出来，这对传统的测试方法和理论提出了新的挑战。这里重点介绍了基于Internet网络版应用程序的并发测试方法研究与技巧，提供了一些实践经验，总结了在并发测试时应该注意的一些实际问题。     

鄂西高速公路岩体结构面强度参数试验研究

对湖北省西部某高速公路宜昌—恩施段主要岩体结构面(层面)的抗剪强度参数进行了较系统的试验研究,包括岩体结构面的野外地质调查、岩体结构面原位直剪试验、结构面室内模拟试验及岩体力学参数估值等。通过对各种试验数据进行整理、分析和对比,得到了岩体结构面强度参数。最后在岩体工程分类的基础上,利用Hoek-Brown经验方法对各类岩体结构面强度参数进行了估算。综合以上多种数据,并考虑岩体结构面所处具体地质条件,提出了各类岩体结构面强度参数建议值。     

Investigations into the Preparation of Ultra-Fine Particle Size Geochemical Reference Materials

Although over recent years, sensitivity and precision of modern analytical techniques have continuously improved, traditional analytical specification for the particle size of samples has remained at 74 μm (-200 mesh). For this reason, the uncertainty caused by inhomogeneity in test portions of the sample itself has become a more and more significant contribution to the total analytical uncertainty. Therefore, to reduce this total uncertainty, the first step is to improve the homogeneity by reducing the particle size of a sample. For this purpose, we have investigated a method for the preparation of ultra-fine reference materials. Using the modern ultra-fine crushing technique (jet mill), six marine sediment samples MSAn and MSCS-1 to 5 were prepared and the particle distributions of these samples were measured using a laser particle-analyser. The average particle size of these samples was 4–5 (im and the largest particle size was less than 30 (im. MSAn will be used as the sample for a future GeoPT(tm) proficiency testing round and MSCS-1 to 5 will be prepared as reference materials. All geochemical laboratories are welcome to participate in this co-operative research programme. The processing and use of ultra-fine samples (< 30 μm) will have a significant influence on the future development of geoanalytical techniques as a consequence of the potential reduction in the mass of test portion and the development of new geoanalytical systems.     

GA型旁压仪的应用及成果分析

在南水北调工程中应用ＧＡ型旁压仪对地基进行原位测试。介绍了ＧＡ型旁压仪的基本结构、工作原理、测试及有关计算方法,并对其典型旁压的试验成果进行了分析。     

微机数控旋转流变仪的设计

微机数控旋转流变仪是一种泥浆流变参数微机智能检测仪器。介绍了其工作原理、性能指标和特点,以及硬件、传感器设计和软件功能设计。     

桩基的现场试验及试桩施工技术

介绍了钻孔灌注桩试桩的目的、试桩种类、试桩方法及试桩中的一般规定,从全面质量管理的角度分计划、实施、检查、总结四个阶段介绍了试桩施工技术。     

岩样单轴压缩的失稳破坏和试验机加载性能

岩样单轴压缩过程的应力-应变曲线是特定岩样与试验机共同作用的结果,并非岩石材料的力学特性;以此观点研究了不同形状岩样峰后强度降低的规律．给出了岩样与试验机联合作用模型,得到了简单而明确的岩样失稳破坏准则;讨论了电液伺服试验机的加载特性和获取全程曲线的方法,并对Ⅱ类全程曲线作出了新的解释。     

Estimation of Probabilities of Three Kinds of Petrologic Hypotheses with Bayes Theorem

Physical-chemical explanations of the causes of variations in rock suites are evaluated by comparing predicted to measured compositions. Consistent data turn an explanation into a viable hypothesis. Predicted and measured values seldom are equal, creating problems of defining consistency and quantifying confidence in the hypthesis. Bayes theorem leads to methods for testing alternative hypotheses. Information available prior to data collection provides estimates of prior probabilities for competing hypotheses. After consideration of new data, Bayes theorem updates the probabilities for the hypotheses being correct, returning posterior probabilities. Bayes factors, B, are a means of expressing Bayes theorem if there are two hypotheses, H ₀ and H ₁. For fixed values of the prior probabilities, B > 1 implies an increased posterior probability for H ₀ over its prior probability, whereas B < 1 implies an increased posterior probability for H ₁ over its prior probability. Three common problems are: (1) comparing variances in sets of data with known analytical uncertainties, (2) comparing mean values of two datasets with known analytical uncertainties, and (3) determining whether a data point falls on a predicted trend. The probability is better than 0.9934 that lava flows of the 1968 eruption of Kilauea Volcano, Hawaii, are from a single magma batch. The probability is 0.99 that lava flows from two outcrops near Mount Edziza, British Columbia, are from different magma batches, suggesting that the two outcrops can be the same age only by an unlikely coincidence. Bayes factors for hypotheses relating lava flows from Volcano Mountain, Yukon Territory, by crystal fractionation support the hypothesis for one flow but the factor for another flow is so small it practically guarantees the fractionation hypothesis is wrong. Probabilities for petrologic hypotheses cannot become large with a single line of evidence; several data points or datasets are required for high probabilities.