广州某工程浅部严重缺陷桩成因探讨

分析了广州市区某工程锤击沉管灌注桩大量出现浅层严重缺陷桩的原因，并提出了减少严重缺陷桩的建议。     

青藏铁路高原多年冻土区片石通风路基

抛填片(块)石通风路堤具有保护多年冻土的作用，根据高原多年冻土区路基常见病害及青藏铁路试验路基设计原则，初步探讨并预测该路基结构的适应性，并在清水河试验路基段进行了实践应用，给出了保护效果的定量描述。     

高速公路红砂岩的路用性能及施工工艺研究

已有高速公路路堤工程实践表明 ,红砂岩在大气环境或干湿循环作用下 ,岩块易崩解碎裂、颗粒软化、强度降低 ,是一种不良的路基填料。但红砂岩在我国分布较广泛 ,尤其在山区公路建设中大量存在。为此 ,结合大量的试验研究 ,对红砂岩的物理力学性质和路用性能进行了探讨 ,提出了以“预崩解耙压碾压”为核心的红砂岩路基填筑施工工艺和处理技术     

桩头缺陷时域与频域特征分析

本文是根据大量的工程桩基检测实践 ,分别对桩头缺陷 -—松散、浮浆、夹泥、空洞等特征进行分析比较 ,给出桩头缺陷对应的时域与频域特征。文中并给出在桩基检测过程对桩头处理应注意的事项。     

关于《测绘产品质量评定标准》缺陷分类与量化的浅见

通过学习《测绘产品检验验收评定标准》,冻结合实际工作从三方面,即《标准》中的缺陷分类有关条款的看法,单位产品分值计算方法以及对控制测量如何根据闭合差,中误差计算分值等内容,提出个人意见和建议。     

灌注桩混凝土水下浇注的工程事故预及处理

结合工程实例,阐述了灌注桩水下浇注混凝土的技术要点,针对施工中常见的工程事故,提出了预防及处理的技术措施.方法切实可行,效果显著.     

青藏铁路可调式通风管路基的数值仿真分析

Finite Element Method has been used to operate the numerical analysis and comparison between the traditional ventilated embankment and the adjustable ventilated embankment adopted in Qinghai-Tibet Railway construction. The numerical results show that: 1) The adjustable ventilated embankments can prevent the thermal entry from air into ducts during summer from thawing the permafrost beneath the embankments; 2) The cooling effects of the adjustable ventilated embankments on permafrost is much better than the traditional ventilated embankments although two kinds of embankments can generate the thawing bulbs at the beginning of finishing construction; 3) The drop of the mean temperature of permafrost under the adjustable ventilated embankments keeps faster than that of the mean temperature of permafrost under the traditional ventilated embankments. It is clear that the adjustable ventilated embankments can keep the embankment more stable than the traditional ventilated embankments.     

青藏铁路通风路基边界条件研究

In permafrost regions, many methods about active cooling embankment are put forward, one of these representations is ventilated embankment, its cooling effect is the result of the air convection in the duct, and this leads to reducing the annual average ground temperature. The present work in this article is to determine the boundary conditions of the ventilated embankment and natural ground in numerical work. There are several effects which influence boundary conditions, they are: radiation, evaporation,phase change, convection and embankment material etc. Radiation and convection are the main effects in those. We mainly consider sun radiation in this article. The added-surface effect in ventilated embankment lowers its temperature, so the temperature on the wall of the ventilated embankment is different from the temperature in atmosphere. There are two methods in determining the surface temperature, experimental method and experiential method. Detailed research is discussed in the article.     

沪蓉公路高坪至吉心段工程地质及不良地质问题对策

沪蓉国道主干线湖北省宜昌至恩施公路高坪-吉心段路线走廊带地处云贵高原之东北部边缘的"鄂西高原",属武陵山、大娄山、八面山的余脉,为中低山-低中山地形,地面高程多在500m以上,地形复杂,路基工程地质条件复杂多变,不良地质现象发育,尤其是喀斯特工程地质问题突出。介绍该线路区工程地质状况,探讨不良地质问题的对策。     

内宜高速公路K96+800～K99+380段路基病害成因及防治方法探讨

内宜高速公路K96＋800－K99＋380路段穿越多个山丘和谷地。自1998年路基建成以来，该段路基发生过量沉降及侧向挤出坍滑等病害，主要原因是路堤填筑土高度和厚度大，下伏淤泥质土孔隙比大，加之路堤施工速度快，附加剪应力高，荷载宽度大等。采取压浆和旋喃及粉喷桩相结合的处理工程，即上部填筑土体系采取压浆加固，下部淤泥质土等采取旋喷及粉喷桩加固，不仅可提高地基土的密实度，也可防治路基的侧向塑性挤出和坍滑。