本文選題：強(qiáng)夯 + 紅砂巖�。� 參考：《鄭州大學(xué)》2017年碩士論文

【摘要】：紅砂巖地層廣泛分布于湖南西南山區(qū),具有強(qiáng)度低,抗風(fēng)化能力差、遇水軟化、失水崩解等不良力學(xué)性質(zhì)。選用紅砂巖碎石土作為山區(qū)高速公路路基回填料,需對(duì)紅砂巖碎石土的基本性質(zhì)及填筑工藝進(jìn)行科學(xué)探究。因此,開展強(qiáng)夯法在山區(qū)高速公路紅砂巖碎石土回填路基的試驗(yàn)研究,并提出適用性的強(qiáng)夯加固工藝和高效的原位試驗(yàn)方法,具有一定理論和實(shí)際意義。本文依托湖南西南山區(qū)武靖高速公路某回填土路基試驗(yàn)段工程,根據(jù)現(xiàn)場(chǎng)地勘結(jié)果,結(jié)合國內(nèi)外相關(guān)文獻(xiàn)資料,開展強(qiáng)夯法在山區(qū)高速公路紅砂巖碎石土回填路基的試驗(yàn)研究。首先,基于強(qiáng)夯法波動(dòng)理論及飽和土與非飽和土加固理論,研究紅砂巖碎石回填土的土的加固機(jī)理;同時(shí),從強(qiáng)夯施工參數(shù)及土體本身物理性質(zhì)兩方面,討論紅砂巖碎石回填土的強(qiáng)夯加固影響因素。其次,開展強(qiáng)夯法在山區(qū)高速公路紅砂巖碎石土回填路基的試驗(yàn)研究。通過地質(zhì)勘查和室內(nèi)土工試驗(yàn),結(jié)合以往紅砂巖類似工程的處理經(jīng)驗(yàn),對(duì)山區(qū)紅砂巖碎石土作為路基填料可行性進(jìn)行探究,確定紅砂巖碎石土預(yù)崩解處理工藝,并制定了800kN·m、1000kN·m、1200kN·m、1400kN·m等四個(gè)不同能級(jí)的強(qiáng)夯加固方案及試驗(yàn)方案。在強(qiáng)夯加固紅砂巖碎石土回填路基過程中,運(yùn)用平板荷載試驗(yàn)、動(dòng)力觸探試驗(yàn)、面波試驗(yàn)、路基土變形試驗(yàn)等方法,探究山區(qū)紅砂巖碎石土回填路基的強(qiáng)夯加固效果。確定適宜的強(qiáng)夯工藝為:當(dāng)回填土厚度為4~5m時(shí),以采用I1-2區(qū)1000 kN·m的強(qiáng)夯工藝為宜;當(dāng)回填土厚度為5~6m時(shí),以采用I1-3區(qū)1200 kN·m的強(qiáng)夯工藝為宜。最后,通過現(xiàn)場(chǎng)試驗(yàn)設(shè)計(jì)及數(shù)理統(tǒng)計(jì)方法,開展原位試驗(yàn)之間的相關(guān)性研究,發(fā)現(xiàn)平板荷載試驗(yàn)、動(dòng)力觸探試驗(yàn)、瞬態(tài)瑞利波試驗(yàn)之間存在一定相關(guān)性,并得出相關(guān)性經(jīng)驗(yàn)公式,可用于簡化后續(xù)大面積施工時(shí)的試驗(yàn)方案,加快工程進(jìn)度,節(jié)約檢測(cè)費(fèi)用。
[Abstract]:The red sandstone strata are widely distributed in the southwest mountainous area of Hunan Province. They have poor mechanical properties such as low strength, poor weathering resistance, water softening and water loss disintegration. In order to select red sandstone gravel soil as the filling material of highway roadbed in mountainous area, the basic properties and filling technology of red sandstone gravel soil should be studied scientifically. Therefore, it is of certain theoretical and practical significance to carry out the experimental study of dynamic compaction method in the backfill roadbed of red sandstone gravel soil of mountain expressway, and to put forward the applicable technology of dynamic compaction and high-efficient in-situ test method. Based on a backfill roadbed test section of Wujing Expressway in southwest mountainous area of Hunan Province, according to the results of field geological prospecting and related documents at home and abroad, the experimental study of dynamic compaction method for backfilling roadbed of red sandstone gravel soil in mountainous expressway is carried out in this paper. Firstly, based on the wave theory of dynamic compaction method and the reinforcement theory of saturated soil and unsaturated soil, the reinforcement mechanism of red sandstone gravel backfill soil is studied, at the same time, from two aspects of dynamic compaction construction parameters and physical properties of soil itself, The influence factors of dynamic consolidation of red sandstone gravel backfill are discussed. Secondly, the dynamic compaction method is applied to the embankment backfill of red sandstone gravel soil in mountain expressway. Through geological exploration and laboratory geotechnical test, combined with previous experience in similar projects of red sandstone, the feasibility of red sandstone gravel soil as subgrade filler in mountainous area was explored, and the pre-disintegration treatment technology of red sandstone gravel soil was determined. The reinforcement scheme and test scheme of four different energy levels, such as 1000kN ~ (1 000) KN ~ (1 000) KN ~ (1 000) N ~ (-1) ~ (-1) KN ~ (1 +) and 1400kN ~ (m), are In the course of dynamic consolidation of red sandstone gravel soil backfill subgrade, using the methods of plate load test, dynamic penetration test, surface wave test, subgrade soil deformation test and so on, the effect of dynamic compaction on the backfill subgrade of red sandstone gravel soil in mountainous area is explored. The suitable dynamic compaction technology is determined as follows: when the backfill thickness is 45 m, the dynamic compaction process of 1000 km in the I1-2 area is suitable, and the dynamic compaction process of 1200 km in the I1-3 area is suitable when the backfill thickness is 5 ~ 6 m. Finally, through the field test design and mathematical statistics method, the correlation between in-situ test and in-situ test is studied. It is found that there is a certain correlation among plate load test, dynamic penetration test and transient Rayleigh wave test. The empirical formula of correlation can be used to simplify the test scheme of the follow-up large-scale construction, accelerate the progress of the project and save the testing cost.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U416.1

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