软土地基处理过程中搅拌桩下沉的机理和判别方法

针对江苏某高速公路软土地基处理过程中的水泥搅拌桩下沉现象,通过现场测量桩周土中的超静孔隙水压力、土压力和剪切强度等,分析搅拌桩下沉机理,提出搅拌桩下沉的判别方法。超静孔隙水压力和土压力的现场测试结果表明,在搅拌桩下沉处,桩周土中的超静孔隙水压力大于土压力,桩周土出现了类似于液化的现象,可以以此作为搅拌桩下沉的判别方法。

沉井基础工程下沉施工方法与技术措施

我国的建设进程加快,基础建设也成为了我国建设的重点,各项基础建设技术随之产生.在地下构造物以及深基础建设中,为加快相关建设,沉井施工法被发明,并得到了广泛应用,成为了重要的施工方法.本文结合我公司对巢湖市内城水系综合治理（截污治污）工程,分析了沉井基础工程中的下沉施工方法与技术.希望能够为我国基础工程建设提供一定的指导,促进我国基础工程建设,提高经济效益与发展.

沉井下沉施工及常见问题的预防与处理措施

沉井是用于修建深基础和地下构筑物施工的一种技术方法,因其有诸多的施工优点,在市政工程中得到较为广泛的应用。本文通过阐述沉井的下沉方法,分析施工中常见的问题,并制定相应的预防和处理措施,为类似工程总结经验。

某超深沉井不排水开挖数值模拟分析

南京某沉井项目采用了下沉式竖井掘进施工方法(VSM),拟该工艺为国内首次运用。基于MIDAS GTS NX有限元分析软件,对下沉式竖井掘进过程进行了数值模拟,并将模拟结果与实际监测数据进行对比,分析其施工影响。结果表明,模拟数据与监测数据吻合良好,为以后此工法的运用提供了参考。

青海省阿岱至李家峡高速公路黄河大桥主墩承台施工技术方案的选定

本文主要论述黄河大桥主墩承台施工方案的选定。

Analysis of factors and countermeasures of mining subsidence in Kaiyang Phosphorus Mine

Ground crack and subsidence were investigated in Kaiyang Phosphorus Mine as an example. Contribution factors to cause ground crack and mining subsidence were studied, including mining method, mining depth and ore thickness and stope size, dip angle of orebody, geological structure, nature of overburden and water contents, and roof supports, etc. Countermeasures against cracks and subsidence were put forward. The uniaxial compressive strength of compounded phosphorus gypsum after 28 d of curing period was tested to be more than 1 MPa. Phosphorus gypsum can be used as materials for the backfill of stope. By comparison and numerical simulation, cut and fill mining method with middle-deep drilling holes and ore transportation by blasting force was selected as the optimum mining method in Kaiyang Phosphorus Mine.