一种复合加固剂改良砂土的强度试验研究

本研究采用聚丙烯纤维和聚氨酯型固化剂复合加固材料（简称复合加固剂）对砂土进行改良,对不同配比的复合加固剂改良砂土的强度,进行了无侧限抗压和直剪试验研究,并对其改良机理进行较为深入的分析。试验结果表明,复合加固剂改良砂土的无侧限抗压强度和剪切强度均得到了一定程度的提高。当复合加固剂中固化剂的浓度一定时,砂土的无侧限抗压强度和黏聚力均随着纤维含量的增加先增加后减少,分别在纤维含量0.3%和0.2%左右达到峰值;当复合加固剂中纤维含量一定时,砂土的无侧限抗压强度和黏聚力均随着固化剂浓度增加而增加,而内摩擦角变化不大。综合试验结果和施工可行性,建议复合固化剂在改良砂土应用中的最佳配比为聚氨酯固化剂浓度30%,聚丙烯纤维含量0.2%。复合加固剂是结合物理和化学加固方式,能够有效地提高砂土强度。本研究结果为复合加固材料的进一步研究和应用提供一定的参考依据。     

上海联诚综合大楼基础类型及持力层选择的工程地质论证

软土作为地基，在工程实际中往往会遇到不少问题。本文以上海联诚综合大楼的岩土工程勘察为例，重点分析了软土基础类型，砂土液化及持力层的选择等问题，这对相同类型的建筑物有一定的参考价值。     

复合纤维加固钢筋混凝土梁受剪性能试验研究

对14根钢筋混凝土矩形梁进行抗剪加固试验，研究在受剪区粘贴高强复合纤维的加固效果和设计方法。主要分析了纤维粘贴量、包裹方法和剪跨比等因素对钢筋混凝土加固梁受剪性能的影响和作用。对试验梁进行了全过程分析，并基于试验结果，提出了抗剪加固设计中复合纤维设计应变的合理取值和计算公式，阐述了具体加固设计模型和设计方法。     

浅层振填法应用探讨

浅层振填法是一种处理加固不良浅层地基土的新方法，本文对其基本原理和处理效果进行了较系统的论述和探讨。     

昌图地区小型病险水库存在问题及除险加固对策探析

昌图县95%的小型水库存在病险,急需进行除险加固工程,从而确保水库的运行安全。本文针对昌图县小型水库的病险和存在问题进行剖析,提出除险加固总体方案,重点对除险加固工程建设管理对策进行探讨,认为应加强管理手段,保证所需资金,加强前期工作,运用科学管理方法,保证除险加固工作顺利进行,发挥水库经济效益和社会效益,为其他地区小型病险水库加固建设管理具有参考价值。     

豆芽棚滑坡治理工程及效果

对处于临滑状态的豆芽棚滑坡进行综合治理，实施排水、加固、支档和减载等工程。经多种监测结果证明，工程治理效果良好。     

广西 土地整治惠及600多万农民

“十一五”期间,广西各级政府和国土资源管理部门共实施国家和自治区投资土地整理项目以及大石山区土地整理、桂西五县土地整理、边境3～20公里“兴边富民”行动基础设施建设大会战上地开发整理、小型病险水库除险加固土地整理、南百高速公路沿线（城乡风貌改造区）土地整治和整村推进土地整治等土地整治重大工程,     

Uplift of symmetrical anchor plates by using grid-fixed reinforced reinforcement in cohesionless soil

Uplift response of symmetrical anchor plates with and without grid fixed reinforced （GFR） reinforcement was evaluated in model tests and numerical simulations by Plaxis. Many variations of reinforcement layers were used to reinforce the sandy soil over symmetrical anchor plates. In the current research, different factors such as relative density of sand, embedment ratios, and various GFR parameters including size, number of layers, and the proximity of the layer to the symmetrical anchor plate were investigated in a scale model. The failure mechanism and the associated rupture surface were observed and evaluated. GFR, a tied up system made of fiber reinforcement polymer （FRP） strips and end balls, was connected to the geosynthetic material and anchored into the soil. Test results showed that using GFR reinforcement significantly improved the uplift capacity of anchor plates. It was found that the inclusion of one layer of GFR, which rested directly on the top of the anchor plate, was more effective in enhancing the anchor capacity itself than other methods. It was found that by including GFR the uplift response was improved by 29%. Multi layers of GFR proved more effective in enhancing the uplift capacity than a single GFR reinforcement. This is due to the additional anchorage provided by the GFR at each level of reinforcement. In general, the results show that the uplift capacity of symmetrical anchor plates in loose and dense sand can be significantly increased by the inclusion of GFR. It was also observed that the inclusion of GFR reduced the requirement for a large L/D ratio to achieve the required uplift capacity. The laboratory and numerical analysis results are found to be in agreement in terms of breakout factor and failure mechanism pattern.     

高喷灌浆技术在防渗加固长善垸浏阳河防洪大堤堤基中的应用

高喷灌浆在长善垸浏阳河防洪大堤第四系松散地基的防渗、加固中效果显著，与其它防渗措施比较，其施工速度快，成本低，在深度覆盖层堤基防渗中显示出无可比拟的优越性。