Experimental evaluation of dynamic deformation characteristics of sheet pile retaining walls with fiber reinforced backfill     

R. Jamshidi  I. Towhata  H. Ghiassian  A.R. Tabarsa 《Soil Dynamics and Earthquake Engineering》2010

Fiber reinforced soil behaves as a composite material in which fibers of relatively high tensile strength are embedded in a matrix of soil. Shear stresses in the soil mobilize tensile resistance in the fibers, which in turn imparts greater strength to the soil. In this paper a study on the influence of synthetic fibrous materials in improving the dynamic response characteristics of fine sandy soil is reported. The project aims at converting fibrous carpet waste into a value-added product for soil reinforcement. A series of five shaking table tests using rigid box were carried out on Toyoura sand specimens reinforced with randomly distributed geotextile strips. The dynamic deformation characteristics of the reinforced sand are defined in terms of wall lateral deformation and rotation. The results clearly indicate the effectiveness of fiber reinforcement in improving dynamic properties of fine sand and deformation characteristics of fiber reinforced sheet pile retaining wall during shaking.  相似文献   

基于概念设计的长短桩复合地基典型工程应用模式          下载免费PDF全文

郭密文  隋旺华  闫德刚 《水文地质工程地质》2010,37(3):92-96

本文从长短桩复合地基各组成部分的功能角度,阐述了长桩、短桩、褥垫层的作用机理,提出长短桩复合地基概念设计应遵循的设计原则。应用概念设计思想,建立了长短桩复合地基的五种典型工程应用模式,并在各典型模式的分析说明中,提出设计与施工参数的选用建议。通过在北京某工程的实际应用,显示长短桩复合地基的典型工程应用模式具有较好的实用性。  相似文献   

既有基坑延深开挖稳定性评价与支护方案确定   总被引：8，自引：0，他引：8  

蔡海波  吴顺川  周喻 《岩土力学》2011,32(11):3306-3311

以北京市某特殊基坑工程为背景,采用FLAC3D软件,选用Mohr-Coulomb准则,对基坑在现有支护方案条件下进行延深开挖,计算分析桩锚支护体系的变形、受力情况。结果表明,基坑在现有支护方案条件下进行延深开挖将导致护坡桩抗弯性能不足、支护结构水平位移过大、锚固体系失效等问题,要保证基坑延深开挖后的安全稳定,必须对护坡桩增设支点,增加支护力。根据设计变更要求及施工现场实际条件,对多种加固支护方案进行比选,最终选用对护坡桩增设锚索的方案进行延深基坑的预加固。采用数值方法模拟分析上述加固方案后的基坑延深开挖力学行为,预测基坑及支护结构的变形情况,并与现场监测数据进行对比分析。结果表明,基坑延深开挖预加固支护方案合理有效,表明该方法对于类似工程的设计优化及现场施工具有重要的参考意义。  相似文献   

聚丙烯纤维复合土抗裂补强特性试验研究   总被引：4，自引：0，他引：4  

王伟  王中华  曾媛  普群 《岩土力学》2011,32(3):703-708

将聚丙烯纤维按不同类型、不同组合、不同含量掺入土中的三轴压缩试验,研究了聚丙烯纤维复合土的应力-应变性状及对复合土强度特性的影响。试验结果表明,加固黏性土要选择分散性好的束状单丝聚丙烯纤维,而不是网状聚丙烯纤维,聚丙烯纤维按占土质量0.2%时为最佳掺入量,束状单丝聚丙烯纤维长度为6 mm+10 mm+15 mm+19 mm的4种组合较为理想,可使聚丙烯纤维复合土微结构联结强度得到明显改善,抗裂补强,黏性土抗剪强度得到极大的提高。  相似文献   

真空预压在沿海软土地基加固中的应用          下载免费PDF全文

徐建华  胡宾荣 《探矿工程》2009,36(6):47-50

宁波安博（北仑）港物流中心拟在海滨软土地基上建造2幢1—2层厂房。根据场地条件和土层特性,其软基采用真空预压法加固处理。施工过程中注意质量控制点的把握,精心组织施工;同时认真有效地对施工过程中和施工后对各种原位测试数据进行系统采集研究分析,结果证明,本次真空预压加固达到地基处理目标的各项要求,取得了成功。  相似文献   

旋喷桩在盾构法隧道端头井洞口土体加固工程中的应用          下载免费PDF全文

高成梁  梁小强 《探矿工程》2009,36(12):69-72

盾构法隧道在进行盾构机的始发或到达作业时,当既有端头井洞口挡土墙结构凿除后,保证该位置土体在盾构机刀盘贯入或脱离地层前一段时间内的稳定就成了盾构机始发或到达施工的关键。结合工程实例,从高压注浆原理、注浆参数和施工工艺等方面阐述了二重管旋喷桩在盾构法隧道端头井洞口土体加固工程中的应用。再者,针对旋喷桩加固以及与其相关的盾构始发或到达施工技术方面的一些问题也提出了一些建议和看法。  相似文献   

Test on application of distributed fiber optic sensing technique into soil slope monitoring   总被引：4，自引：1，他引：3  

Bao-jun Wang  Ke Li  Bin Shi  Guang-qing Wei 《Landslides》2009,6(1):61-68

Brillouin optical time-domain reflectometer (BOTDR), a newly developed distributed fiber optic sensing technique, has been proved to be a very suitable and useful technique for monitoring and early warning of structural engineering by laboratory tests and practical projects due to its unique functions, such as distributing, long distance, anti-electromagnetic interference, waterproof, etc. However, its application to geotechnical engineering, especially soil-slope engineering, has been less carried out due to the complexity of the characteristics of geotechnical materials in the field. In this paper, BOTDR technique is applied to monitor the deformation of a laboratory soil-slope model in small scale in order to test the feasibility and early-warning characteristics of this technique with monitoring the deformation of soil slope. Different types of optical fibers are planted directly in the soil-slope model or bonded to geotextiles and geogrids that are planted in the fillings of the test model. Strain measurements of the model slope under various loads are obtained by BOTDR. By data processing and analysis, the abnormal strains can be obtained distributively, and the position of the abnormal strains can be located as well. The results show much valuable information for applications of BOTDR technique into soil-slope engineering. The test proves that the BOTDR technique can be used to ensure the stability of artificial soil slope and is useful for monitoring and early warning of the artificial soil-slope engineering.  相似文献   

浅谈甘肃省病险水库现状及加固措施          下载免费PDF全文

林迎德 《甘肃地质》2009,(2):69-71

加快病险水库除险加固,确保水库安全,充分发挥防洪和兴利效益,对促进国民经济发展和人民生活水平的提高,具有重要意义。本文针对我省病险水库现状,提出了一些加固建议,以供参考。  相似文献   

土工织物加筋体在提高路堤稳定性方面的应用     

陈福恩  蒋智超  李剑锋  王凯  张建华  刘春阔 《化工矿产地质》2009,31(4):247-250

加筋技术在地基处理过程中的应用已经广泛应用,加筋作用原理、应力传递和加筋作用机理的研究与工程应用已经日趋成熟,就路基填筑的填筑材料特性、路基碾压施工特点及路基的断面形式,结合土工织物的筋材性状,对路基填筑中的加筋技术进行了设计与检算,并且提出了施工坡面防护措施。  相似文献   

浅析公路边坡防护与加固   总被引：1，自引：0，他引：1  

樊占平 《中国勘察设计》2009,(6):66-68

介绍了公路边坡防护与加固的类型,对各类防护与加固方法的优缺点进行了分析,并结合隆昔公路的工程实践提出意见和建议。  相似文献