毛乌素沙漠地区风积沙工程特性试验研究

发布时间：2018-09-10 13:36

【摘要】：本文在沙漠地区选取典型沙样,系统地开展了风积沙工程特性试验研究,主要工作如下:(1)针对陕西、新疆、内蒙沙漠地区风积沙,开展了颗粒筛分和化学成份等物理化学试验。(2)对风积沙进行底部振动、表面振动及重型击实等试验。根据不同表面压力、含水率、振动时间、振动频率及振幅等工况下的试验结果,提出了不同细颗粒含量(d≤0.074mm)时风积沙最大干密度确定方法,并对底部振动确定风积沙最大干密度时试验仪器、试验步骤及注意事项提出了明确要求。(3)风积沙的静力特性直接影响路基的强度和稳定性,其主要指标包括压缩模量、抗剪强度、加州承载比CBR及回弹模量等参数。试验过程中,通过变化风积沙的含水率及压实度等参数,得出含水率、压实度与静力特性指标之间的统计规律。(4)通过分析加州承载比CBR、压缩模量、抗剪强度、回弹模量等试验结果,得出了风积沙的压力——变形规律,其中风积沙在干燥状态下,应力——变形基本呈线性关系,表现为弹性性质;含水率变化时,对风积沙单位变形具有一定影响。
[Abstract]:In this paper, the typical sand samples are selected in the desert area, and the engineering characteristics of eolian sand are studied systematically. The main work is as follows: (1) aiming at the eolian sand in the desert areas of Shaanxi, Xinjiang and Inner Mongolia, Physical and chemical tests such as particle screening and chemical composition were carried out. (2) the bottom vibration, surface vibration and heavy compaction tests of eolian sand were carried out. According to the test results of different surface pressure, moisture content, vibration time, vibration frequency and amplitude, a method for determining the maximum dry density of eolian sand with different fine particle content (d 鈮，

本文编号：2234597