二灰碎石基层施工的关键技术和质量控制

针对上海当前二灰碎石基层施工技术现状，研究提高二灰碎石基层施工质量的关键技术和质量控髑要点。扩展了现行规范方法中的参数抽样检验公式，使其适用于如二灰碎石基层顶面弯沉等呈对效正态分布参数的情况。     

土基回弹模量分布特征的研究

根据一组实测的土基回弹模量值，采用概率理论对实测值的算术值和对数值频率分布进行比较分析，得出土基回弹模量具有显著的对数正态分布特征。     

断桩的形成与处治

钻孔灌注桩的整个施工过程都属于隐蔽工程项目,质量检查比较困难,只有加强桩基工程的检测并使现场管理人员增强责任心,以防为主,对桩基各个施工环节充分重视并精心施工,才能使桩基的质量控制得到保证。     

西藏地区级配碎（砾）石柔性基层设计与施工

通过对在西藏地区特殊自然条件下的级配碎（砾）石柔性基层的设计和施工方法进行研究,提出满足西藏特殊自然条件下的路面结构、材料组成及施工工艺,可使高寒、紫外线照射强烈、路面冻害严重、地质复杂、筑路材料缺乏的西藏地区的路面结构合理、经济耐久、安全可靠。     

浅谈鹤大公路钻孔灌注桩断桩的防治措施

结合鹤大公路钻孔灌注桩的具体实践,从五个方面时钻孔灌注桩断桩的防治措施进行了论述。     

浅谈水泥混凝土路面裂缝和断板产生的原因及预防措施

通过对水泥混凝土路面裂缝和断板病害产生原因的分析．从设计和施工方面提出防治措施。     

某潜艇柴油发电机组联轴器断裂原因分析

针对某潜艇柴油发电机组联轴器断裂故障,进行故障勘查,系统地分析了联轴器的结构特点、发生断裂的内外在因素,并采用计算机软件对传动板作受力和强度分析,最终提出合理的处理意见。     

Ship resistance in random ice field of small ice floes made of the substitute material北大核心CSCD

［Objectives］This study focuses on the feasibility of a ship resistance model test in an ice field of small ice floes made of substitute material in order to reveal the resistance components and thereby provide technical support for the design of ice-going ships. ［Methods ］ Ship resistance test in ice floes made of polypropylene (PP) instead of natural refrigerated ice is conducted. By adjusting the sizes, shapes, numbers of ice floes, the random ice field with a given concentration is generated. The geometric phase transition theory predicts that there exists a critical concentration which divides the random ice field into discrete phase (concentration is less than critical value) and connected phase (concentration is greater than critical value). ［Results］The main components of ice resistance in the discrete phase are open water resistance and ship-ice collision resistance, while ice resistance in the connected phase includes ice friction resistance, open water friction resistance and collision resistance. If the fractal dimension of the random ice field is used to redefine the ice resistance coefficient, it is nearly constant in the trial range (speed 0.3–0.9 m/s) when the concentration is smaller than the critical value. When the concentration is greater than the critical value, the ice friction resistance is inversely proportional to speed. ［Conclusions］Polypropylene can replace frozen ice in the prediction of ice resistance. The pure ice resistance of an ice field is divided into two components: ice resistance arising from collision and ice friction resistance arising from accumulation. © 2022 Journal of Clinical Hepatology. All rights reserved.     

轨道交通(轻轨)车站结构设计探讨

在城市轨道交通(轻轨)地面车站,主要是高架车站的结构设计中,分析研究其荷载类型、荷载工况对车站结构计算的安全可靠性意义重大。其中还有有效控制沉降问题。该文分析荷载类型、荷载工况,建立计算模型提出看法,供设计人员参考。     

破碎水平岩层地质条件下隧道钻爆法施工

在隧道施工中通过对水平岩层围岩压力进行实测,总结水平岩层隧道的围岩压力特点。依据水平岩层隧道围岩力学特性和初期支护作用原理,有针对性地调整初期支护参数,现场实施后通过监控量测对围岩和支护稳定性进行检验。依据地下水和破碎带对水平岩层的影响,总结破碎带地段水平岩层隧道施工技术措施,达到了快速、安全、经济施工,对类似工程有一定的借鉴和参考价值。