However , this kind of foundation becomes a complex system under the interaction of pile - beam - soil and the behavior of the foundation is still not clearly explained . as this kind of foundation is used in a great number of buildings every year in china , further research on the interaction of pile - beam - soil is needed . a computing program of crossed foundation beam is developed by using the coordinate alteration matrix and taking into account the action of soil under the foundation beam 通过考虑梁下地基土对基础梁的各向支承作用,引入坐标变换矩阵对任意方向上的基础梁进行坐标变换,使其能适用于格式基础梁(包括非正交格式基础梁)的计算,同时采用荷载修正法修正格式基础梁中基底重叠面积的影响,用刚度修正法修正桩?梁基础中基底重叠面积的影响。
Yarlung was a cradle to many talented people : er lhang zenmang , songtsan - gampo , sambhora , lobsang gyatso , dhawa - dolma , changche gyantsan , drapa gyantsan and changchi thuten shajialooking back at history , nobody will deny that this is indeed fertile land which has given birth to so many outstanding people 俄良赞芒松赞干布吞弥桑布扎罗桑嘉措达娃卓玛降曲坚赞扎马紧赞强基土登夏甲,看看这些名垂青史的雅砻儿女,谁能说这块土地不是孕育杰出儿女最肥沃的土壤?
The test obsvervation include air temperature , ground temperature , foundation moisture , freeze depth , freeze capicity , freeze residual capicity , groundwater table and shape transform of canal lining , etc . throught systemic observation , analysis of impact about each factor on fundation freeze capicity , evaluate effect on anti freeze of various canal lining , comparison on technology and ecnomic of different method , a kind of main canal lining format is been recommended to engineering practice with siutable to ningxia local feature , fufilling the need of main canal safey i application , economic and practical , that is using polystyrene plate laying under concrete slate and grit taking replace of filling layer and optimizing design 试验观测内容包括气温、地温、基土含水量、冻深、冻胀量、冻胀剩余量、地下水位和砌体外观变化等项目。通过系统的观测,分析各因素对基土冻胀量的影响,评价各种衬砌型式的防冻西安理工大学工程硕士专业学位论文胀效果,并进行技术和经济综合分析比较,推荐出了适合我区特点、满足干渠安全运行、经济实用、防冻胀效果好的干渠防渗衬砌型式,即混凝土板下铺设聚苯乙烯板和砂砾石换填层结构型式,加以优化设计,用于工程实践。
Deep and thick soft soil is extensively distributed along the river and wreath lake and etc . when introduced general pile foundation without thinked the toft power under the foundation board , piles needs so many that the structure of soft soil is destroyed and possibly crushed soil problem be caused 在沿江、环湖和沿海地区,广泛分布着深厚软土。采用常规桩基础时,不考虑基础底板下地基土的地基承载力,布桩密度往往较大,软土的结构性遭到破坏,同时可能会产生严重的挤土问题,使环境受到影响。
The columns internal forces of a 12 - storey rc frame with and without support loss are investigated by using three dimension finite element method considering soil - structure interaction . the support loss is expressed by soil voids , which are set up as 10 different sizes and locations . results of the study indicate that the effect of support loss on the columns axial forces changes little , the influences of bending moments of the frame columns are substantial . with the stories increase and the voids sizes enlarge and the voids location are far away from the foundation , the influences for the bending moments lessens gradually 利用有限元法,通过对一栋12层钢筋混凝土框架结构在10种地基土支承损失条件下,土与上部结构协同工作的三维分析,探讨了框架柱内力变化的基本趋势.结果表明,支承损失对柱子轴力影响很小,对弯矩值的影响较大;但随着楼层的增高和表示地基土支承损失的土中孔洞尺寸的减小,以及其所在位置与基础地面距离的加大,对柱弯矩的影响逐渐减小
In view of the technical problems of softening of foundation soil and reduction of bearing capacity of the breakwater under the action of repeated wave loads during the execution of the second phase of the deepwater waterway regulation project in the changjiang estuary , tianjin port construction corporation has successfully developed safer , higher quality and highly efficient technology and special - purpose marine craft and machinery for laying deepwater sand blankets and offshore installation of prefabricated drains , which were more suitable for the working conditions in the changjiang estuary , and has also explored the construction technology for prefabrication of caissons with rubber anti - sliding plates , to ensure the efficient implementation of the engineering measures against softening of foundation soil 摘要针对长江口深水航道治理二期工程施工过程中遇到的堤身在波浪重复荷载作用下地基土出现软化、承载力降低的技术难题,第一航务工程局成功开发了适合长江口工况的安全、优质、高效的深水砂被铺设和海上塑料排水板打设施工工艺及专用船机设备,探索了一整套带橡胶阻滑板的沉箱预制施工工艺,确保了抗软化工程措施的有效实施。
Strip - shape underground structures such as the tunnels and tubes for various uses can be treated as a beam on elastic foundation under earthquake condition , although there exists soil - structure interaction , the foundation soil vibration is dominant in other words , analysis of earthquake response of the soil is essential to this end , simplified models , ( i . e equivalent mass system models based on some equivalence criteria ) are proposed , instead of a general 3 - d continuum model in this study , equivalence criteria are proposed and the simplified models are compared the single - mass - string model is proved to be valid and therefore applied to the analysis of earthquake response of the pearl river immersed tunnel 条装地下结构如隧道、各种埋设管道等一般可看作弹性地基梁进行静力及动力分析在地震条件下,结构与土相互作用,但土的振动成为主要因素为分析土的地震响应需把基土这一三维连续体作简化处理,简化成为等效多质点模型本文着重探讨这种简化模型的建立方法,推导等效方程,通过几种简化体系的分析比较,论证单质点串体系的合理性,并将其应用到广州黄沙芳村珠江水下隧道工程的地震响应分析,为抗震设计提供依据
Abstract : with a view to the defects at the bottom section of the deep mixed pipes , the analysis is made of the adverse effect of the acidic soil ground rich in water on the curing strength of the cement soil through the stabilization mechanism of the cement deep mixing method , and the way to improve is proposed 文摘:针对工程中出现的深层搅拌桩深部桩身质量不合格问题,结合水泥系深层搅拌法加固地基的作用机理,分析探讨了酸性富水地基土对水泥土凝结强度的不利影响,提出了改进意见。
So ansys is applied here to calculate the response of ground under moving loads in light railway system . at the locations with the big vibration , two measures for vibration - diminishing ? wave impeding block and open drain for isolating vibration are constructed , and the effective of vibration - diminishing is analyzed 因此在计算轻轨列车荷载作用下地基土的响应时,本文运用ansys软件进行模拟,在振动较大的地方采用设置阻波区( wib , waveimpedingblock )和隔振沟两种减振措施,同时对减振效果进行分析比较,得到了较为理想的结果。