冲击碾压法处理粉土地基试验研究   总被引：3，自引：0，他引：3  

徐超  陈忠清  叶观宝  肖媛媛  丁天锐 《岩土力学》2011,32(Z2):389-392

冲击碾压法作为一种高效、经济的压实技术,已经广泛应用于各种路基压实和软基处理等领域,并不断被应用于新的领域。通过现场试验,结合试验过程中地下水位、地表沉降和孔隙水压力等项目的监测结果以及处理后标准贯入试验和静力触探试验的检测成果,探讨了冲击碾压法用于消除浅层粉土地基液化的有效性和相应的施工工艺。试验研究表明,采用冲击碾压法可消除浅层粉土地基的液化,并且2 m深度范围内地基土的压实效果明显。研究成果证明了冲击碾压法在消除浅层地基液化领域的适用性。  相似文献   

冲击压路机在填石路基中补强压实的应用   总被引：2，自引：0，他引：2  

卢达  邓家喜  郝纯中 《中国岩溶》2005,24(2):152-155

通过对填石料的压实特性分析以及振动压路机、冲击压路机在填石路基压实中的试验对比,提出填石路基要达到较好的密实状态,必须选用大功率的压实机械,而采用冲击压路机对填石路基进行15～ 20遍的补强压实,则可以较大幅度的提高路基密实程度,减少填石路堤的工后沉降,这对填石路基的长期稳定有很重要的意义。   相似文献   

A parametric study of seismic behavior of roller seismic isolation bearings for highway bridges     

Yu‐Chen Ou  George C. Lee 《地震工程与结构动力学》2010,39(5):541-559

A roller seismic isolation bearing is proposed for use in highway bridges. The bearing utilizes a rolling mechanism to achieve seismic isolation and has a zero post‐elastic stiffness under horizontal ground motions, a self‐centering capability, and unique friction devices for supplemental energy dissipation. The objectives of this research are to investigate the seismic behavior of the proposed bearing using parametric studies (1) with nonlinear response history analysis and (2) with equivalent linear analysis according to the AASHTO guide specifications, and by comparing the results from both analysis methods (3) to evaluate the accuracy of the AASHTO equivalent linear method for predicting the peak displacement of the proposed bearing during an earthquake. Twenty‐eight ground motions are used in the studies. The parameters examined are the sloping angle of the intermediate plate of the bearing, the amount of friction force for supplemental energy dissipation, and the peak ground acceleration levels of the ground motions. The peak displacement and base shear of the bearing are calculated. Results of the studies show that a larger sloping angle does not reduce the peak displacement for most of the parametric combinations without friction devices. However, for parametric combinations with friction devices, it allows for the use of a higher friction force, which effectively reduces the peak displacement, while keeping a self‐centering capability. The AASHTO equivalent linear method may underestimate the peak displacement by as much as 40%. Vertical ground motions have little effect on the peak displacement, but significantly increase the peak base shear. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

碾压混凝土结构的接缝灌浆技术     

张发明  陈俊 《地球科学与环境学报》1999,21(2):2

在碾压混凝土结构中进行接缝灌浆,是目前坝工研究的重要技术问题。以某工程为例,详细分析了影响接缝灌浆质量的因素,提出了特殊条件下接缝灌浆的技术方法  相似文献