嵌岩扩底灌注桩及MRR型基岩扩底钻头

简要介绍了国内外扩底技术现状、扩底灌注桩的特点、ＭＲＲ型基岩扩底钻头的结构及技术参数，结合工程实例对ＭＲＲ１０００钻头的使用效果进行了分析。     

旋喷桩质量的检测及对复合地基的评价

本文以成渝高速公路桥基为实例,介绍了对旋喷桩质量的检测方法和对复合地基的评价.     

灌注桩,钢管桩连接及锚杆联合支护技术

本文通过工程实例介绍了基坑支护技术。灌注桩构成连续墙起档土作用;钢管桩解决地下水位以下无法进行灌注桩施工的难题,起嵌固作用;锚杆起锚固作用;三者构成基坑支护体系。     

穿条式隔热型材的水中浸泡试验与湿热试验

对穿条式隔热型材的水中浸泡与湿热试验按照即将发布的隔热型材新标准中规定的试验方法进行了大量的试验、计算和分析。结果表明:两种试验后的横向抗拉特征值的降低量基本都没有超过30%,说明了新标准中提出的要求是完全可以达到的。     

Dynamic impedance of pile and caisson foundations

Abstract

The dynamic impedance of a pile or caisson foundation embedded in a homogeneous visco elastic half‐space was evaluated using the hybrid method. The soil‐foundation system is partitioned into a near‐field and a far‐field by choosing a cylindrical interface passing through the soil region very close to the foundation. The near‐field is modeled by the finite element method while the far‐field is characterized by a frequency‐dependent impedance matrix through the continuum approach. From the results presented, it is shown that the proposed method is very effective and can be widely used for parameter studies in engineering applications.     

Highlighting the base zone effect on the compression and recovery properties of the rugs with innovating Double-Base Persian rug

This paper investigates the compression and recovery properties of the rugs by highlighting the base zone effect. To fulfill this purpose, a new type of rug named Double-Base Persian Rug was prepared. In the new rug, the warping was done such that we have two sets of warp sheets (back base and front base warp yarns). So that, a gap between these two bases were created that could be filled with various types of fillers. A total of seven rug samples; a conventional Persian rug as the base of comparison and six new types of rug samples were produced. Then, the compression and recovery properties of the rug samples were investigated by static loading test. Generally, the results indicated that the rug base structure and the inherent characteristics of the materials used in the rug base as a filler positive affect the rug compression and recovery properties.     

筘槽内引纬气流场分布及其对纬纱飞行的影响

为了解喷气引纬纬纱的实际运动状态和筘槽内引纬气体流场的分布变化与纬纱运动状态的关系,采用高速摄影系统,对喷气引纬时纬纱在异型筘槽内飞行的实际状态拍摄记录,可以看出纬纱在筘槽内呈旋转螺旋状前行。通过气体流场测试装置,对筘槽内喷气引纬的气体流场进行测试分析,认为因筘槽内引纬气体流场的特殊动态分布变化使纬纱作旋转螺旋状前行。对第1辅助喷嘴喷向角做适当调整,可以降低第1、第2辅助喷嘴间段上引纬气体流场的波动变化。     

人工挖孔混凝土灌注桩在储油罐基础中的应用

在储油罐基础的设计和施工中,冲锥冲孔桩、回旋钻机钻孔桩、静压预制桩、水泥深层搅拌桩、人工挖孔桩应用较多。结合工程实例,探讨了人工挖孔混凝土灌注桩在施工质量、进度、造价方面的优势,并就其施工要点与安全进行分析。     

烟草T-DNA插入位点侧翼序列扩增方法的筛选与优化

烟草T-DNA激活标签插入突变体库的创制过程中,需要进行大量的T-DNA插入位点的侧翼序列扩增,因此选择一种适用于烟草T-DNA侧翼序列扩增的高效方法尤为必要。本研究比较了TAIL-PCR、PCR-walking、FPNI-PCR三种方法对T-DNA插入位点侧翼序列的扩增效率、插入位点确定的比例和同源蛋白比对结果,并对3种方法的PCR程序、体系和引物设计等方面进行了优化,确定TAIL-PCR更适合烟草的侧翼序列扩增,通过产率、条带长度、插入位点和同源蛋白比对结果的比较,得出TAIL-PCR更适合烟草的侧翼序列扩增。这一结果为应用烟草突变体开展烟草基因功能的研究奠定了基础。     

无捻毛巾产品毛羽问题的分析与实践

对无捻毛巾产品毛羽问题进行了分析,对成因进行了初步探索.通过试验,制定了较为有效的改进措施和工艺.无捻毛巾制品的毛羽问题得到改善,并控制在一个较为合理的范围内.