1) negative frictional force
负摩擦阻力
1.
It focuses on discussing negative frictional force and introducing construction specifications and quality control method.
介绍灰土井在软弱地基上的应用和适用范围,重点论述灰土井在处理软弱地基时应如何考虑负摩擦阻力问题,提出灰土井在施工时的注意事项和控制施工质量的方法,并以工程实例证明灰土井处理软弱地基的技术经济效果。
2) negative friction force
负摩擦力
1.
The negative friction force has a close relation with soil qualit.
以冻结法施工的某矿副井为例 ,编制有限元程序 ,对冻结壁融沉作用在井壁上负摩擦力进行弹塑性分析 ,初步得到该负摩擦力的分布规律及影响因素 ,即该融沉负摩擦力在深度方向上由地表到中上部呈递增 ,然后呈递减 ;融沉负摩擦力与土层的性质、水平侧压力大小、融沉量等因素密切相关。
2.
After performing the inverse Laplace transform,the variations of negative friction force and the dissipation of the pore pressure in the time-space domain for a pi.
根据Biot固结理论,采用Laplace和Hankel变换方法得到了半空间饱和土体内受垂直载荷作用下的变换域内基本解,再根据虚拟桩法,得出了单桩的第二类Fredholm积分方程,最后通过对积分方程的数值求解得出了在圆形载荷作用下,单桩桩侧的负摩擦力以及桩的孔压消散变化的情况。
3) negative friction resistance
负摩阻力
1.
Calculation of negative friction resistance of pile foundation in collapsible loess region;
湿陷性黄土地区桩基的负摩阻力计算
2.
The strata melts to sink,and producing strata to press newly,the negative friction resistance is produced around the venical pit.
地层融陷,形成新地压,在竖井周围,产生负摩阻力;第三系泥岩受承压水侵蚀膨胀,造成井壁破裂。
4) negative friction
负摩擦力
1.
Design of negative friction of pile foundation and its application;
关于桩基础负摩擦力设计和应用实例报告
2.
By applying theories of Fuzzy sets,proposal is offered of an analytic method of Fuzzy inversion of negative friction on shafts through de watered subsiding grounds.
采用模糊集理论,提出了一种模糊反演疏水沉降地层井筒负摩擦力的分析方法。
3.
Another procedure was compiled based on the load transfer function method to calculate the negative friction on the displacement pile which was induced by the soil reconsolidation around the pile.
基于比奥固结理论和ADINA有限元程序,分析了打桩完成后土中超孔隙水压力的消散和桩周土随时间固结沉降情况;然后结合荷载传递函数法,编制计算程序,对某一具体工程桩周土体重固结引起的在挤土桩上产生的负摩擦力及其时效性进行了研究。
5) Negative frictional force
负摩擦力
1.
Discussion on negative frictional force of big-diameter pile and its shape & properties;
大直径桩的负摩擦力及性状的探讨
2.
On the basis of testing results,the authors analyse the reasons of shaft lining fracture,such as excessively practical frozen pressure and unfavourable influence of the negative frictional force,and put forward some of the methods which could be used to prevent shaft cining fracture.
在此基础上,分析了井壁破坏的原因,如实际冻结压力偏大,负摩擦力的不利影响等,提出了防止井壁破坏的措施。
6) negative skin friction
负摩阻力
1.
Model tests on negative skin friction of rectangular closed diaphragm wall foundation;
矩形闭合地下连续墙基础负摩阻力模型试验研究
2.
Field tests on negative skin friction along piles caused by seismic settlement of loess;
黄土场地震陷时桩基负摩阻力的现场试验研究
3.
Numerical simulation of negative skin friction on single pile in multiple layer deposits;
多层地基单桩负摩阻力的数值模拟计算
参考词条
补充资料:风流摩擦阻力
风流摩擦阻力
friction resistance of airflow
卞engi一u moeo zull风流摩擦阻力(frietion resistanee of airflow) 风流与井巷周壁间摩擦和风流微团或流层间摩擦所产生的切应力。风流以层流状态沿井巷流动时,摩擦阻力与平均风速的一次方成正比;风流以稳定紊流状态沿井巷流动时,摩擦阻力与平均风速的二次方成正比。矿内风流多属稳定紊流,摩擦阻力等于井巷风阻与风量平方之积: 凡一尺fQZ _a尸L R一‘汁于二 S3式中hf为紊流摩擦阻力,Pa;尺f为井巷的摩擦风阻,N‘52/m“,其值取决于井巷的几何尺寸和周壁的粗糙度,与风量无关;Q为流过的风量,m“,/s;尸为井巷净断面的周边长,m;L为井巷的长度,m;S为井巷净断面面积,mZ;a为井巷摩擦阻力系数,N·52/m书。井巷摩擦阻力系数,是由井巷周壁的粗糙度和流过井巷空气的密度所决定的常数。混凝土砌碳的巷道,。为。,。。4一0.。。8,无支护巷道为0.008~。.016,木棚和其他棚架支护巷道为0.016一。.024,有装备物的井筒为().024~0.050。 (陈旺星)
说明:补充资料仅用于学习参考,请勿用于其它任何用途。