真空-堆载联合预压加固软基的沉降分析  

Analysis on Settlement of the Soft Ground Improved by the Combined Preloading with Vacuum-surcharge

作　　者：蒲晓芳[1] 张云[1] 刘运涛[1] 高倚山[2] 孙亚哲[2] 

机构地区：[1]南京大学地球科学系,南京210093 [2]中国电力工程顾问集团华东电力设计院,上海200063

出　　处：《工程勘察》2008年第3期14-18,22,共6页Geotechnical Investigation & Surveying

摘　　要：以某煤场试验区现场垂向变形测试数据为基础,分析了真空-堆载联合预压下土层的垂向变形特点和沉降随时间的变化过程。在抽真空初期和堆载初期沉降速率最大,能达到54mm/d,真空-堆载联合预压阶段,沉降是趋势渐变、幅度收敛的过程。真空预压的加固深度在边缘处能达到19m左右。土体压缩变形主要发生在地面下7.5～15m之间。介绍了拉格朗日(Lagrange)插值法,并运用Asaoka法、指数曲线法、双曲线法推算最终沉降量,与实测资料进行对比,讨论了3种方法的适用性及优缺点。计算结果表明Asoaka法推算的结果与实测值最为接近,是预测最终沉降的一种较为理想的方法。Based on the vertical displacement data from field tests, the vertical deformation and settlement changing with time.are analyzed for the soft ground improved by using combined preloading with vacuum-surcharge in a coal mining field. The rate of settlement reached the maximum of 54mm/d in the early stage of vacuum pumping and loading. During the period of the combined preloading with vacuum-surcharge the tendency of settlement increased, but the rate of the settlement decreased. The depth influenced by vacuum preloading is about 19m at the margin of the experimental field and the major compressive layers are within the depth from 7.5m to 15m below ground surface.Lagrange interpolation is introduced and Asaoka method, index curve method and hyperbolic method are used to calculate the final Settlement. Through the contrast to the data from field tests the applicability, advantages and disadvantages of the said method are discussed. The results indicate that Asaoka method in the three methods is the best way to predict the final settlement.

关 键 词：真空-堆载联合预压 最终沉降量 拉格朗日(Lagrange)插值 ASAOKA法 指数法 双曲线法 

分 类 号：TU447[建筑科学—岩土工程]