In this study, two series of physical modeling experiments, with and without a grouting process, were conducted under different grouting pressures to study the effect of compaction grouting on the performance of compaction-grouted soil nails. In addition, a hyperbola-based model was proposed to describe the variation of the pullout forces with and without grouting. Some of the main conclusions drawn are as follows. First, the compaction effect initially influences the mobilized pullout force, but not the final stage of pullout; the large difference between the two series of tests in regard to the pullout force at the initial stage led to the first part of this conclusion. However, the final pullout force results of the tests, both those with and those without grouting, were similar. Second, once the soil condition changes, the compaction effect on the performance of a soil nail depends on the grouting pressure rather than the diameter of the grout bulb. Third, the difference in the soil response (i.e., vertical dilatancy and the vertical and horizontal squeezing effects) derived from the compaction grouting effect will result in the initial difference in the increased rate of the pullout force between the tests with a grouting process and those without. Finally, a hyperbola-based model was proposed to describe the variation of the pullout force of the model tests with and without grouting, through which the pullout force is available of prediction for the given diameter of grout bulb and pullout displacement.
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通过对压密注浆工艺的技术和经济分析比较,并介绍该工艺在处理浜填土地基中的成功经验,从而得出压密注浆工艺是一种造价低、施工操作简便、周期短、加固效果良好的处理地基方法。 相似文献
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本文通过压密注浆在加固处理浜土软弱地基的施工实例,以及在几种不同工程场地的对比试验,认为压密注浆处理浜土软弱地基是行之有效的,它具有加固效果好、工效高、成本低,是一种较理想的地基加固方法。 相似文献
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目前,压密注浆处理软弱地基的质量检测方法以载荷板试验、标贯、轻便触探和静力触探为主,上述方法虽然精度较高但是难以用来进行普测.近期我们将瞬态瑞雷面波技术应用某工程压密注浆地基加固处理效果评价之中,取得了一定效果. 相似文献
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本文结合作者从事的压密注浆加固软土地基的设计及检测的工程.叙述了压密注浆的加固原理、加固效果;影响加固效果的各种因素、适用范围等,并例举了二个项目成功加固案例,同时指出了压密注浆在建筑工程上其它方面的应用前景。 相似文献
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缅甸船厂12000DWT干船坞工程在抽水试验井施工过程中发生部分井壁坍塌,究其原因,有地下水动力作用的自然因素,又有桩基础挤土效应、压密注浆等人为诱发因素。通过现场观测和分析,在利用地下水动力作用方向的基础上,采取了改善泥浆性能、预先释放挤土应力等措施后,井壁无坍塌现象出现。经抽水试验验证,成井效果良好。 相似文献
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《Geomechanics and Geoengineering》2013,8(1):9-19
This research paper is focused on the fundamental behaviour of applying static and dynamic compaction grouting techniques on completely decomposed granite (CDG) soils in Hong Kong. Using the modified triaxial apparatus and a novel pulse wave generator, laboratory tests were performed to identify the critical controllable factors of static and dynamic compaction grouting techniques in optimizing compaction effectiveness. The distinguishing feature of this laboratory apparatus is that it can simulate triaxial condition of static and dynamic compaction grouting. The effective confining pressure, the lateral pressure coefficient, excess pore water pressure, back pressure and void ratio change of the specimen were measured in this study. At the same time, the dynamic compaction grouting pressure, dynamic compaction frequency, and dynamic compaction duration were controlled. Moreover, the effects of effective confining pressure and injection rate on the compaction efficiency in static tests were studied. The study focused on the effect of dynamic compaction frequency, dynamic compaction duration, lateral pressure coefficient and initial dry density on the compaction efficiency of Hong Kong CDG soils. 相似文献
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Compaction grouting is the injection of a viscous grout into a soil under high pressure, which then densifies the surrounding soil by reducing void space. Laboratory and field tests of compaction grouting have been carried out. In this paper, a numerical model is used to simulate the compaction grouting process with the primary purpose of investigating relationships among various control parameters, such as injection pressure, void ratio and excess pore water pressure at various radial distances from the injection point. The compaction process is treated as a cavity expansion process in the numerical simulation. The soil is modelled with an elasto-plastic Mohr–Coulomb model using the commercial finite element program ABAQUS. In addition to numerical simulations, pressure-controlled cavity expansion laboratory tests were carried out on completely decomposed granite (CDG) soil specimens. Data collected from laboratory tests are compared with the finite element simulation to validate the finite element analyses. Factors that control the compaction process, such as the coefficient of earth pressure (K), initial void ratio, number of loading cycles and effective confining pressure, are explored in the numerical simulations. 相似文献
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抚顺市东岗道桥公路由于连接东、西露天矿的隧道施工及东露天矿西端帮剥离致使东露天矿西端帮土体滑移,路面出现裂隙、变形,迫使东侧公路停用。结合地质情况,采用压密注浆施工技术对东露天矿西端帮边坡土体、公路进行压密注浆加固处理。经测量数据检验,东露天矿西端帮边坡及公路沉降变形趋于稳定,达到预期效果,保证了东露天矿西端帮边坡稳定及公路的正常安全使用。 相似文献
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边坡多阶段注浆加固模型 总被引：1，自引：0，他引：1
实践中总结证明注浆法用于边坡加固及滑坡防治是可行的,提炼提出边坡多阶段注浆加固模型。该模型以传统的渗透、充填、压密及劈裂注浆理论为基础,以弹塑性力学中的球形、柱形扩张理论及Boussinesq、Terzaghi理论为指导,推导出多阶段注浆法不同地层及不同阶段的注浆压力、注浆半径及注浆应力分布数学表达式(过程力学模型);用大量试验数据总结出加固后水泥土力学指标统计规律和多阶段注浆加固设计计算模型。多阶段注浆加固模型已在施工项目中得到证实。 相似文献
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通过工程实例,介绍了一种在深厚杂填土基坑中运用钢管土钉结合压密注浆技术的围护方法,对钢管土钉及压密注浆的设计及施工作了详细说明。监测结果表明,该支护方法可以有效控制基坑变形,确保基坑及地下结构施工期的安全,为类似条件的基坑围护工程提供借鉴。 相似文献
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分析了深厚表土层地面注浆加固过程中井壁的受力特点,介绍了金桥矿副井表土段地面注浆加固过程中井壁的应变观测结论,提出了深厚表土层井壁外注浆加固工程的井壁安全保证核心技术。 相似文献
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