透水混凝土的力學性能及在護坡工程中的應用技術(shù)研究
發(fā)布時間：2018-08-31 16:42
【摘要】：隨著我國經(jīng)濟的快速發(fā)展以及城市化進展水平的不斷提高，人們愈來愈意識到環(huán)境保的護重要性，要求邊坡防護工程不但要考慮其穩(wěn)固性還要具有綠化功能。透水混凝土是一種多孔結(jié)構(gòu)，具有一定的連續(xù)空隙，為植物的生長提供了可能。在此基礎(chǔ)上開發(fā)出的植生型透水混凝土，由透水混凝土通過降低堿性、注入基質(zhì)、鋪設(shè)客土、播種植物并后期養(yǎng)護制得。然而這種混凝土在孔隙率能滿足植物生長要求時，其強度往往又難以達到工程應用的條件。 本文將透水混凝土與錨噴技術(shù)相結(jié)合，研究一種既能對巖質(zhì)邊坡進行整體防護又可起到綠化功能的新型生態(tài)護坡技術(shù)，即錨噴植生型透水混凝土生態(tài)護坡技術(shù)。在透水混凝土的配合比設(shè)計過程中，主要考慮其孔隙率和強度問題。錨噴混凝土的強度要求至少為20MPa，為了提供植生基材的填充空間和植被根系的生長空間，一般要求透水混凝土孔隙率要在20％以上。由于噴射管道直徑的限制，噴射透水最大骨料粒徑一般小于15mm。本文的研究內(nèi)容就是要找出滿足條件的透水混凝土配合比，并將其應用在護坡工程中。 本文重點結(jié)合工程特點，借鑒相關(guān)領(lǐng)域生態(tài)防護和錨噴防護做法，對錨噴植生型透水混凝土在巖質(zhì)邊坡防護工程中的應用進行分析和探討。主要完成了以下內(nèi)容： 1、結(jié)合工程技術(shù)的需要，確定以骨料粒徑和粉煤灰替代率為變量對透水混凝土進行分組配合比設(shè)計。即以骨料粒徑（2.5~5mm、5~10mm、10~15mm）和粉煤灰替代率（0、10%、20%、40%）分組設(shè)計配合比并確定材料用量。 2、對不同配合比的試件進行抗壓強度試驗、抗折強度試驗、孔隙率和透水系數(shù)測定。結(jié)果表明當骨料粒徑為10~15mm，粉煤灰替代率為20%時，其28天抗壓強度達到21.89MPa、孔隙率為21.3%，滿足錨噴透水混凝土的技術(shù)要求。 3、根據(jù)實驗數(shù)據(jù)分析表明隨著骨料粒徑的增大，透水性混凝土實測孔隙率變大，抗壓和抗折強度增加，，透水系數(shù)增大；隨著粉煤灰替代率的增加，透水性混凝土孔隙率減小，透水系數(shù)變小，而當粉煤灰替代率為20%時，抗壓和抗折強度提高最多。 4、結(jié)合工程實例對應用錨噴植生混凝土技術(shù)對巖質(zhì)邊坡進行防護設(shè)計和優(yōu)化了施工工藝。 5、通過數(shù)值模擬分析邊坡防護前后的穩(wěn)定性，驗證錨噴植生混凝土技術(shù)的可行性。
[Abstract]:With the rapid development of economy and the improvement of urbanization level, people are becoming more and more aware of the importance of environmental protection, which requires slope protection not only to consider its stability but also to have greening function. Permeable concrete is a porous structure with certain continuous voids, which provides the possibility for plant growth. On this basis, the water permeable plant concrete was developed by reducing the alkalinity, injecting the matrix, laying the Hakka soil, sowing the plants and curing it later. However, when the porosity of the concrete can meet the requirements of plant growth, its strength is often difficult to meet the conditions of engineering application. In this paper, a new ecological slope protection technology, which can not only protect the rock slope as a whole but also play the greening function, is studied by combining the permeable concrete with the anchoring and shotcreting technology, that is, the ecological slope protection technology of the anchoring and shotcreting type permeable concrete. In the process of mix design of permeable concrete, porosity and strength are mainly considered. The strength of Anchorage shotcreting concrete is at least 20 MPA. In order to provide filling space for planting base material and growth space for vegetation root system, the porosity of permeable concrete is generally required to be above 20%. The maximum diameter of jet permeable aggregate is generally less than 15 mm. due to the limitation of injection pipe diameter. The research content of this paper is to find out the mixture ratio of permeable concrete which meets the conditions and apply it to slope protection project. Based on the characteristics of engineering, the application of water-permeable concrete in rock slope protection is analyzed and discussed in this paper based on the methods of ecological protection and Anchorage shotcrete protection in related fields. The main contents are as follows: 1. According to the need of engineering technology, the aggregate particle size and fly ash substitution rate are selected as variables to design the proportion of the permeable concrete. The mixture ratio was designed in groups of aggregate particle size (2.5 ~ 5 mm ~ 5 ~ 10 mm ~ 10 mm ~ 1015 mm) and fly ash substitution rate (0 ~ 10 ~ 10 ~ 20 ~ 40%) and the material dosage was determined. 2. The compressive strength test, flexural strength test, porosity and water permeability coefficient were tested on the specimens with different mix ratio. The results show that when the aggregate diameter is 10 ~ 15mm and the replacement ratio of fly ash is 20, the compressive strength and porosity are 21.89 MPA and 21.3 MPA respectively, which meet the technical requirements of water-permeable concrete. 3. According to the experimental data analysis, it is shown that with the increase of aggregate particle size, The measured porosity of permeable concrete increases, the compressive and flexural strength increases, and the permeability coefficient increases. With the increase of the replacement ratio of fly ash, the porosity of permeable concrete decreases and the permeability coefficient becomes smaller, but when the replacement ratio of fly ash is 20, The compressive and flexural strength are increased most. 4. Combined with engineering examples, the protection design and construction technology of rock slope with Anchorage and shotcrete technology are designed and optimized. 5. The slope is analyzed by numerical simulation Stability before and after protection, Verify the feasibility of Anchorage and shotcrete technology.
【學位授予單位】：武漢輕工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU528
本文編號：2215563
[Abstract]:With the rapid development of economy and the improvement of urbanization level, people are becoming more and more aware of the importance of environmental protection, which requires slope protection not only to consider its stability but also to have greening function. Permeable concrete is a porous structure with certain continuous voids, which provides the possibility for plant growth. On this basis, the water permeable plant concrete was developed by reducing the alkalinity, injecting the matrix, laying the Hakka soil, sowing the plants and curing it later. However, when the porosity of the concrete can meet the requirements of plant growth, its strength is often difficult to meet the conditions of engineering application. In this paper, a new ecological slope protection technology, which can not only protect the rock slope as a whole but also play the greening function, is studied by combining the permeable concrete with the anchoring and shotcreting technology, that is, the ecological slope protection technology of the anchoring and shotcreting type permeable concrete. In the process of mix design of permeable concrete, porosity and strength are mainly considered. The strength of Anchorage shotcreting concrete is at least 20 MPA. In order to provide filling space for planting base material and growth space for vegetation root system, the porosity of permeable concrete is generally required to be above 20%. The maximum diameter of jet permeable aggregate is generally less than 15 mm. due to the limitation of injection pipe diameter. The research content of this paper is to find out the mixture ratio of permeable concrete which meets the conditions and apply it to slope protection project. Based on the characteristics of engineering, the application of water-permeable concrete in rock slope protection is analyzed and discussed in this paper based on the methods of ecological protection and Anchorage shotcrete protection in related fields. The main contents are as follows: 1. According to the need of engineering technology, the aggregate particle size and fly ash substitution rate are selected as variables to design the proportion of the permeable concrete. The mixture ratio was designed in groups of aggregate particle size (2.5 ~ 5 mm ~ 5 ~ 10 mm ~ 10 mm ~ 1015 mm) and fly ash substitution rate (0 ~ 10 ~ 10 ~ 20 ~ 40%) and the material dosage was determined. 2. The compressive strength test, flexural strength test, porosity and water permeability coefficient were tested on the specimens with different mix ratio. The results show that when the aggregate diameter is 10 ~ 15mm and the replacement ratio of fly ash is 20, the compressive strength and porosity are 21.89 MPA and 21.3 MPA respectively, which meet the technical requirements of water-permeable concrete. 3. According to the experimental data analysis, it is shown that with the increase of aggregate particle size, The measured porosity of permeable concrete increases, the compressive and flexural strength increases, and the permeability coefficient increases. With the increase of the replacement ratio of fly ash, the porosity of permeable concrete decreases and the permeability coefficient becomes smaller, but when the replacement ratio of fly ash is 20, The compressive and flexural strength are increased most. 4. Combined with engineering examples, the protection design and construction technology of rock slope with Anchorage and shotcrete technology are designed and optimized. 5. The slope is analyzed by numerical simulation Stability before and after protection, Verify the feasibility of Anchorage and shotcrete technology.
【學位授予單位】：武漢輕工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU528
【參考文獻】
相關(guān)期刊論文 前5條
1 楊靜,蔣國梁;透水性混凝土路面材料強度的研究[J];混凝土;2000年10期
2 張朝輝;王沁芳;楊江金;廖佳慶;楊娟;;透水混凝土配合比研究與設(shè)計[J];混凝土;2008年06期
3 董建偉,肖新民;隨機多孔型綠化混凝土主要生長環(huán)境與構(gòu)造特性[J];吉林水利;2003年08期
4 高建明,吉伯海,吳春篤,劉海峰;植生型多孔混凝土性能的試驗[J];江蘇大學學報(自然科學版);2005年04期
5 蔣正武,孫振平,王培銘;若干因素對多孔透水混凝土性能的影響[J];建筑材料學報;2005年05期
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