一种涵闸软基加固技术被引量：2

A Soft Soil Foundation Reinforcement Technology in Culverts and Water Gates

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摘要以陕西某水利涵闸软基加固工程为研究载体,从加固机理、加固方法和施工应用三方面较为详细地介绍了该方法的研究技术成果。研究表明,采用该方法加固水利工程涵闸软基效果好,现场观测结果显示:沉降量最大区域位于软基加固区中心,沉降量达1.99m;沉降量最小区域位于软基加固区边缘(即距中心30m处)为1.22m,即沉降量分布呈现"凹盆"趋势;抽真空初期沉降值较大,曲线变化趋势较陡,至沉降稳定逐渐趋于平缓;真空预压过程中,加固区不同深度土体孔隙水压力值变化趋势与土体固结规律相同,即随着真空预压时间的增长,其大小与联合堆载荷载值呈正相关增长趋势,而后逐渐趋于平稳;与加固前相比,加固后土体地基承载力和抗剪强度均大幅提高,提高比例分别达到57%~85%和148%~173%;从加固区纵深分析,上层土地基承载力变化明显大于下层土,相比而言,低塑性粉质黏土抗剪强度提高效果优于其他土质。 This paper took culverts and water gates of Shaanxi＇water conservancy reinforcement soft foundation engineering as an example,technical achievements of this method are introduced in detail which includes three aspects of strengthening mechanism,strengthening methods and construction application.Research results show that it is a significant method for reinforcement soft foundation of Culverts and water gates,site observation results show that the largest settlement area is located in the center of the soft foundation reinforcement area,and the settlement amount is up to 1.99 m.The minimum settlement area is located on the edge of the soft foundation reinforcement area（that is,the center of 30 m）,which is 1.22 m,that is,the settlement distribution presents a ＂concave basin＂trend.The large settlement value corre-sponds to the early stage of vacuum pumping,the curve trend is steep,and end the settlement stability gradually tends to be gentle.In vacuum preloading process,as time goes on,the pore water pressure in different depths of reinforcement area is similar to the consolidation law of soil in the vacuum preloading process,the values is positively related to the combined surcharge load value,and then end to the gradually stabilized.Compared with previous reinforcement,the bearing capacity and shear strength of the soil foundation are improved greatly,and the ratio of the soil foundation is 57%to 85%and 148%to 173%respectively.From the depth analysis of the reinforcement area,the bearing capacity of the upper soil foundation is significantly larger than that of the lower soil,compared with the lower soil,the shear strength of the low plasticity silty clay is better than that of the other soil.

作者景宏彬陈国龙王红洲邓友生景宏君孔祥东崔福平 JING Hongbin;CHEN Guolong;WANG Hongzhou;DENG Yousheng;JING Hongjun;KONG Xiangdong;CUI Fuping(Shaanxi Water Affair Group Co.,Ltd.,Xi＇an,Shaanxi 710068,China;Hanzhong Highway Bureau of Shaanxi Province,Hanzhong,Shaanxi 723000,China;Ankang Highway Bureau of Shaanxi Province,Ankang,Shaanxi 725000,China;College of Arehitecture and Civil Engineering,Xi＇ an University of Sk.ienee and Technology,Xi＇an,Shaanxi 710054,China;Jiaokou Irrigation Management Bureau of Shaanxi Pravince,Weinan,Shaanxi 714000,China;China Railway First Group Co.,Ltd.,Xi＇an,Shaanxi 710000,China)