共查询到19条相似文献,搜索用时 66 毫秒
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强夯法在城市防洪工程地基加固中的应用研究 总被引:3,自引:1,他引:3
对宜宾城市防洪工程中粉土地基强夯加固效果进行了检测,其结果表明:采用1 600 kN ? m夯击能,其有效加固深度大于6 m,地基土的干密度得到了明显增加,平均值从天然地基的1.48 g/cm3增加到强夯后的1.57 g/cm3,增幅达到6.1 %;粉土层的孔隙比平均值从0.852减小到0.724;地基土的压缩模量平均值从5.42 MPa提高到8.27 MPa;渗透系数算术平均值降低到天然地基的1/10以下,即从2.5×10-4 cm/s降低到3.5×10-6 cm/s;天然地基标准贯入击数有32.9 %小于5击,强夯以后,击数全部大于7击。粉土地基经过强夯处理,满足了防洪堤地基的承载力和渗透稳定要求,消除了7度地震液化势。 相似文献
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强夯法适用于浅部松软地基,尤其是非常 松且极不均匀的填土地基。根据麻章药材仓库现场的地质条件、工程的使用要求以及前人的经验确定限强夯设计参数,对地基采用强夯法加固处理,利用重型动力探与标准贯入试验相结合的办法进行效果检验,并以仓库建成后的实际效果加以验证,夯后,填土承力比夯前增加50%以上;淤泥强度较大提高,由流塑变成可塑;土的干、湿状态与地基强度密切关关。 相似文献
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强夯法处理地基后承载力的计算 总被引:5,自引:0,他引:5
本文结合工程实践介绍了强夯法处理地基后承载力计算的力学模型和计算方法,并附有已搞过的十个工程实例,将计算值与强夯后检测值进行了分析比较,说明本文公式的正确性。 相似文献
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强夯法加固湿陷性黄土后承载力的研究 总被引:2,自引:0,他引:2
通过现场试验,研究强夯法处理湿陷性黄土后的承载力与夯击能之间的对应关系,为工程技术人员在采用强夯法处理湿陷性黄土时提供参考. 相似文献
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Sanjeev Kumar 《Geotechnical and Geological Engineering》2001,19(2):169-182
In-place soils in the floodplains of major rivers are frequently stabilized to reduce the liquefaction potential when sites are located in earthquake prone areas. A site in the floodplain of the Missouri River in the United States of America was recently remediated to reduce liquefaction potential using the Deep Dynamic Compaction method of densification of in-place soils. Modifications were made to the conventional method in the form of construction of stone columns to densify the in-place soils to deeper depths. Results are presented to show that the modified procedure used at the site satisfactorily remediated the site. Construction of stone columns not only densified the soils to the required depths, but also helped support a five-story office building on conventional strip and spread shallow foundations. Site remediation and an alternative foundation scheme resulted in substantial cost savings without any delay in the construction schedule. 相似文献
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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
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
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黄土的湿陷性对于建筑的安全具有极大的危害性,而强夯法可以有效地消除黄土的湿陷性。通过对强夯前后湿陷性黄土的物理力学性质及微观结构进行对比分析,强夯效果沿深度可分为三段,从3 m至8 m为强夯效果最佳段。强夯使土体中孔径大于20 μm的孔隙含量减少,小于5 μm的孔隙含量增加,土体的致密程度提高。 相似文献
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设计并完成了1:20比尺的黄土边坡大型动力模型试验,探讨了模型试验中的相似律、边界条件处理等问题;研究了强夯激励下黄土边坡的动力特性变化规律与动力响应规律,以及边坡坡率对动力特性和动力响应的影响。试验结果表明,边坡坡率越大,动力响应幅值越大;强夯激励下黄土边坡的动力响应幅值均随冲击荷载作用而产生并迅速衰减;振动周期在1 s之内,主频率在25~45 Hz之间,不会出现振动叠加现象。强夯激励下黄土边坡对径向加速度的放大效应更显著,下部边坡以竖向振动为主,上部边坡以径向振动为主。黄土边坡的边缘部位对强夯冲击振动的反应幅值较之内部存在放大现象。沿坡高方向,边坡对输入加速度具有明显的放大作用,坡顶处的放大效应最为显著。试验结果有助于揭示黄土边坡在强夯激励下的动力响应规律,为黄土地区的工程设计和施工提供有益的参考 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