重塑黄土压缩变形的预测模型研究  

A model for calculating the compressive deformation of remolded loess

作　　者：石博溢[1,2] 倪万魁[1] 王衍汇[1] 李征征[1] 袁志辉[1] 

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710000 [2]杭州市勘测设计研究院,浙江杭州310000

出　　处：《岩土力学》2016年第7期1963-1968,2046,共7页Rock and Soil Mechanics

基　　金：国家科技支撑计划(No.2013BAJ06B04);陕西省科技统筹创新工程计划(No.2012KTDZD03-03;04)~~

摘　　要：针对黄土填方场地的沉降变形问题,通过进行不同初始含水率和干密度的重塑黄土的高压固结试验,发现荷载与干密度的比值(p/pd)与荷载(p)呈很好的线性关系,并以此为依据建立了不同厚度(荷载)填方场地的沉降预测模型。该模型有k和b两个参数,其中k随着初始含水率(w_0)或初始干密度(p_(d0))的增大而减小,三者之间的关系为:p_(d0)k+w0=1;b主要与初始干密度有关,随着初始干密度增大而减小。与前人基于孔隙比和荷载关系所建立的压缩变形计算模型的对比分析发现,用干密度和荷载表示土压缩性的方法与试验数据拟合精度更高,且线性相关性更强,更适合于重塑黄土的压缩变形预测。To evaluate the settlement problem of loess-filled venues, a series of high pressure consolidation tests was conducted on the remolded loess of different initial water contents and dry densities. It is found that the ratio of load to dry density P/Pd is linearly correlated with the applied loading, based on which a settlement prediction model of filled venues of different thicknesses （loads） is established. The model has two parameters, namely, k and b. Parameter k decreases with the increase of initial moisture content w0 or initial dry density Pao, satisfying a relationship among the three variables （i.e., pd0k ＋ w0=l）; whereas parameter b depends mainly upon the initial dry density and decreases with the increase of initial dry density. Compared with the previous compressive deformation calculation models based on the relation between void ratio and loading, the proposed method which has a higher precision fitting with experimental data shows a stronger correlation, showing that it is more suitable for the calculation of compression deformation of remolded loess.

关 键 词：重塑黄土 高压固结试验 初始含水率 初始干密度 压缩变形 预测模型 

分 类 号：P642[天文地球—工程地质学]