Third according to the practice , over 300 g / m2 of the staple nonwoven geotechnical fabric is used in the bank project of the large rivers , its tensile strength is 600 n / 5cm . forth the filtration under the traffic load , normally , the traffic load is repeated load and fast movement . in this case , thick filtration is applied , such as sand and / or thick fabric , of which weight is over 700 g / m2 研究结果表明：对d _ ( 85 ) 0 . 074mm的土料，不宜采用土工织物作滤层；对级配极不均匀的土壤(不均匀系数cu 2或cu 6 ) ，在渗流作用下，很容易发生管涌，对土工织物的选用要慎重；一般大江大河的护坡工程至少应采用300g m ~ 2以上的短纤无纺土工布，其抗拉强度为600n 5cm左右。
Based on vibration principle , the paper establishes dynamics analysis model of output shaft with elastic support , according to fourer series spread principle of periodic function , the dynamic response formula is derived by separating complex vibration force into sum of many simple harmonic excitation function of whole number times frequency relations . the result shows that response of both sides support is synchronous when load distribution non - uniform coefficient is 1 依据振动理论建立了具有弹性支撑的输出轴的动力学分析模型，根据周期函数的傅里叶级数展开原理，将复杂的激振力分解成为多个频率成整倍数关系的简谐激励函数，导出了动态响应表达式，结果表明，当载荷分配不均匀系数为1 . 0时的输出轴两端支撑同步。
When the punched baffle is proper in length , the small holes are in staggered arrangement and the punched ratio gradually increases from the central axis to the boundary along the baffle length , the performance of flow distribution in the plate - fin heat exchanger is effectively improved by the optimum design of header configuration 从实验对比分析中得出，当挡板小孔呈错排分布、开孔率沿挡板的中轴线向两侧逐渐增加、且总开孔率达到50 %左右的时候，在相同的入口条件下，不均匀系数由原始封头的1 . 210降至0 . 209 ，最大流速与最小流速之比由23 . 163降至1 . 756 。
In the light of its special property being not easy to gain strength , through mechanics researches on different methods to stabilize this kind of low _ liquid _ limit silty soil as subbase material , evaluated both technically and economically , we have got a cement lime stabilization plan to meet the index requirements for non _ side _ limit strength of compression of subbase of class2 road stipulated in the specification ; by means of improving the workmanship , thickening the loose layer of soil , adding soil on covering weave fabric before compaction , such problems can be solved as very poor compaction , loose surface during compaction , roughness and unevenness , coats of layer and shear damages 本文针对黄河冲积而成的低液限粉土其粘粒含量极低、土的不均匀系数很小、胶体活性差的工程特性,通过采用不同方法稳定该类土作底基层材料的力学性能研究,从技术、经济角度综合评价,得到满足规范抗压强度指标要求的水泥石灰稳定方案。通过对原材料、试验配合比设计、施工、等方面进行优化,从而显著减轻了基层的早期及长期缩裂程度,从而提高了路面的耐久性。
