本文選題：濕熱地區(qū)　切入點(diǎn)：土水特征曲線　出處：《長(zhǎng)沙理工大學(xué)》2015年碩士論文

【摘要】：濕熱地區(qū)路基濕度受氣候、地下水及路基路面排水等條件的影響,路基濕度隨時(shí)間、空間變化,直接影響路基土體的剛度,甚至影響到路基路面的路用性能等。因而開展?jié)駸岬貐^(qū)路基濕度分布情況,制定有效的濕度穩(wěn)定控制措施控制路基濕度變化,為濕熱地區(qū)路基土濕度設(shè)計(jì)提供參考是十分有意義的。本文首先對(duì)濕熱地區(qū)路基濕度的影響因素進(jìn)行了分析,通過開挖路基斷面,對(duì)斷面路基濕度進(jìn)行試驗(yàn)分析,結(jié)合對(duì)路基硬路肩下方濕度的研究,比較完整的得到了路基濕度的分布狀況,并通過塑限對(duì)平衡濕度進(jìn)行了擬合,得到了低液限黏土和含砂低液限黏土平衡濕度預(yù)測(cè)公式。通過對(duì)路基濕度的長(zhǎng)期的觀測(cè),對(duì)路基土體內(nèi)部的濕度和溫度變化進(jìn)行了分析,得到了路基濕度和溫度的變化規(guī)律。這些結(jié)果為后面路基濕度模擬和路基濕度穩(wěn)定控制技術(shù)提供了有利前提條件。通過對(duì)濕熱地區(qū)低液限黏土和含砂低液限黏土路基濕度模擬參數(shù)試驗(yàn)和調(diào)查得到了路基濕度模擬所需的參數(shù)。對(duì)濕熱地區(qū)兩種土濕度模擬時(shí)土水特征曲線是否考慮豎向應(yīng)力的影響進(jìn)行了模擬對(duì)比分析,最后得出濕度模擬時(shí)土水特征曲線考慮豎向應(yīng)力更符合實(shí)際。在此基礎(chǔ)上進(jìn)行了路基兩種模型考慮土水特征曲線豎向應(yīng)力分析,最后綜合考慮,建議在路基濕度場(chǎng)模擬時(shí),考慮豎向應(yīng)力對(duì)土水特征曲線的影響,且應(yīng)對(duì)邊坡土體數(shù)值建模時(shí)進(jìn)行平行于坡面分層。通過對(duì)路基濕度來(lái)源分析和含水率的入滲分析,得到了控制路基濕度的方法。對(duì)包邊土進(jìn)行了模擬分析得出滲透系數(shù)較小的黏性土包邊對(duì)路基濕度的穩(wěn)定控制具有很好的作用。對(duì)不同厚度砂墊層進(jìn)行了模擬分析得到了砂墊層對(duì)于濕熱地區(qū)降低路基水位和控制路基濕度穩(wěn)定作用不大。
[Abstract]:The humidity of subgrade in humid and hot area is affected by climate, groundwater and drainage of roadbed and pavement. The change of subgrade humidity with time and space directly affects the stiffness of subgrade soil, even affects the road performance of roadbed and pavement.Therefore, it is very meaningful to develop the distribution of subgrade humidity in humid and hot areas, to establish effective humidity stability control measures to control the variation of subgrade humidity, and to provide a reference for the design of subgrade soil humidity in humid and hot areas.In this paper, the influencing factors of subgrade humidity in humid and hot areas are analyzed firstly. Through excavation of roadbed section, the moisture of section roadbed is tested and analyzed, combined with the research on the humidity of roadbed under hard kerb.The distribution of subgrade humidity is obtained completely, and the equilibrium humidity prediction formula of low liquid limit clay and sand containing low liquid limit clay is obtained by fitting the equilibrium humidity with plastic limit.Based on the long-term observation of subgrade humidity, the variation of moisture and temperature in subgrade soil is analyzed, and the variation law of subgrade humidity and temperature is obtained.These results provide a favorable precondition for the simulation of subgrade humidity and the control technology of roadbed humidity stability.The parameters needed for the simulation of subgrade humidity are obtained by testing and investigating the humidity simulation parameters of low liquid limit clay and sand containing low liquid limit clay subgrade in humid and hot areas.Whether the vertical stress is considered in the soil-water characteristic curve of two kinds of soil moisture simulation in humid and hot region is simulated and analyzed. Finally, it is concluded that the soil water characteristic curve in humidity simulation is more suitable for the vertical stress.On this basis, the vertical stress analysis of soil and water characteristic curve is carried out in two subgrade models. Finally, when considering comprehensively, it is suggested that the influence of vertical stress on soil water characteristic curve should be considered in the simulation of subgrade humidity field.And parallel to the slope surface stratification should be carried out in the numerical modeling of slope soil.The method of controlling subgrade humidity is obtained by analyzing the source of subgrade humidity and the infiltration of moisture content.Based on the simulation analysis of embankment soil, it is concluded that the clayey soil with small permeability coefficient has a good effect on the stability control of subgrade humidity.Through the simulation and analysis of sand cushion with different thickness, it is concluded that sand cushion has little effect on reducing the water level of roadbed and controlling the stability of subgrade humidity in humid and hot areas.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.1

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本文編號(hào)：1714489