【摘要】：本文在沙漠地區(qū)選取典型沙樣,系統(tǒng)地開展了風積沙工程特性試驗研究,主要工作如下:(1)針對陜西、新疆、內(nèi)蒙沙漠地區(qū)風積沙,開展了顆粒篩分和化學成份等物理化學試驗。(2)對風積沙進行底部振動、表面振動及重型擊實等試驗。根據(jù)不同表面壓力、含水率、振動時間、振動頻率及振幅等工況下的試驗結(jié)果,提出了不同細顆粒含量(d≤0.074mm)時風積沙最大干密度確定方法,并對底部振動確定風積沙最大干密度時試驗儀器、試驗步驟及注意事項提出了明確要求。(3)風積沙的靜力特性直接影響路基的強度和穩(wěn)定性,其主要指標包括壓縮模量、抗剪強度、加州承載比CBR及回彈模量等參數(shù)。試驗過程中,通過變化風積沙的含水率及壓實度等參數(shù),得出含水率、壓實度與靜力特性指標之間的統(tǒng)計規(guī)律。(4)通過分析加州承載比CBR、壓縮模量、抗剪強度、回彈模量等試驗結(jié)果,得出了風積沙的壓力——變形規(guī)律,其中風積沙在干燥狀態(tài)下,應力——變形基本呈線性關系,表現(xiàn)為彈性性質(zhì);含水率變化時,對風積沙單位變形具有一定影響。
[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，

本文編號：2234597