攀枝花機(jī)場(chǎng)三疊系泥巖工程特性及軟化機(jī)理研究
發(fā)布時(shí)間：2019-03-16 07:07
【摘要】：研究區(qū)位于攀枝花機(jī)場(chǎng)12#滑坡東側(cè),場(chǎng)區(qū)基巖主要為三疊系寶頂組泥巖段,以炭質(zhì)泥巖為主,夾砂巖、粉砂質(zhì)泥巖。12#滑坡及下方易家坪老滑坡下伏基巖上,絕大部分分布有泥巖,填筑料因取自寶頂組泥巖段,含大量的泥巖碎塊碎屑。顯然,攀枝花機(jī)場(chǎng)10.3填筑體失穩(wěn)及老滑坡復(fù)活都與泥巖的軟化有關(guān)。因此,本文針對(duì)該地區(qū)泥巖遇水軟化的特性開(kāi)展一系列試驗(yàn)研究,并得出以下幾點(diǎn)認(rèn)識(shí):(1)泥巖初始成分及結(jié)構(gòu)是泥巖(塊)、泥巖結(jié)構(gòu)面遇水軟化的基礎(chǔ)。研究區(qū)泥巖主要由粘土礦物、原生礦物、簡(jiǎn)單鹽類、碳質(zhì)組成。其中,粘土礦物含量占50~95%,原生礦物占4%~35%;簡(jiǎn)單鹽類中大多數(shù)為可溶鹽。碳質(zhì)含量占1%~10%,與粘土礦物呈互染狀,將削弱粘土礦物顆粒之間的聯(lián)結(jié)。從微觀結(jié)構(gòu)上,粘土礦物呈隱晶-微晶質(zhì)集合體、平行堆疊結(jié)構(gòu),粘土礦物與原生礦物顆粒之間為固體鹽類膠結(jié)。以上初始成分結(jié)構(gòu),決定了研究區(qū)泥巖的天然強(qiáng)度不高(單軸抗壓強(qiáng)度≈10MPa),水穩(wěn)性差、軟化性強(qiáng)。(2)采用純水浸泡試驗(yàn)表明:(1)研究區(qū)泥巖(塊)含水率、孔隙率在飽水過(guò)程中均呈現(xiàn)持續(xù)上升、單軸抗壓強(qiáng)度及抗剪強(qiáng)度則呈持續(xù)衰減趨勢(shì);飽水30天后,泥巖含水率、孔隙率分別增長(zhǎng)122.77%、142.72%;單軸抗壓強(qiáng)度下降81%,c、f值分別減小67.86%和53.12%;(2)泥巖結(jié)構(gòu)面物理力學(xué)性質(zhì)的變化趨勢(shì)大體上同泥巖(塊)的變化趨勢(shì),但它與水的作用更劇烈,軟化過(guò)程更快,其抗剪強(qiáng)度指標(biāo)飽水10天后就開(kāi)始趨于穩(wěn)定。飽水30天后,含水率、孔隙率分別增長(zhǎng)166.67%、195.97%,c、f值分別減小63.27%和41.67%。(3)泥巖的浸潤(rùn)具有明顯的各項(xiàng)異性特征。無(wú)應(yīng)力狀態(tài)下,浸潤(rùn)方向平行層理面時(shí)含水率、孔隙率及浸潤(rùn)深度上升速率明顯比垂直層理面組快。在不同剪應(yīng)力水平下,沿剪切(潛在破壞)面方向的浸潤(rùn)深度、上下試塊的含水率、孔隙率均隨剪應(yīng)力水平增加而增大;剪切面平行層理時(shí)的浸潤(rùn)深度、含水率、孔隙率的增長(zhǎng)要大于垂直層面剪切的情況,且在低應(yīng)力水平兩者的差異較大,在較高應(yīng)力水平兩者差異較小。(4)地下水與應(yīng)力作用是導(dǎo)致泥巖軟化的主要外部因素。采用研究區(qū)地下水作浸泡液,泥巖的化學(xué)成分的溶解與析出受到一定程度的抑制,泥巖力學(xué)性狀的軟化程度不及純水浸泡液的情況。此外,在一定的應(yīng)力作用下,不僅會(huì)直接導(dǎo)致泥巖礦物顆粒之間的結(jié)構(gòu)聯(lián)結(jié)弱化,而且所產(chǎn)生的微裂紋,有利于地下水的浸入,從而加劇泥巖的軟化過(guò)程。(5)研究區(qū)泥巖軟化主要存在四種物理化學(xué)作用:一是以固體可溶鹽溶解析出為特征的化學(xué)溶蝕作用;二是伴隨泥巖溶蝕、孔隙增多增大過(guò)程的楔劈作用;三是泥巖中白云母、長(zhǎng)石的水解作用;四是水的潤(rùn)滑作用。其中,化學(xué)溶蝕作用是主要的,且隨飽水時(shí)間的增加而減弱,楔劈作用主要發(fā)生在飽水的中后期(即化學(xué)溶蝕進(jìn)行到一定程度);水解作用總體比較微弱,潤(rùn)滑作用主要存在于有貫通裂隙的情況(如泥巖結(jié)構(gòu)面的情況)。(6)將泥巖(塊)及結(jié)構(gòu)面的軟化過(guò)程大體上都分為三個(gè)過(guò)程。泥巖(塊):軟化開(kāi)始階段(飽水0~10天)→軟化持續(xù)階段(飽水10~30天)→軟化穩(wěn)定階段(飽水30~60天);泥巖結(jié)構(gòu)面:軟化開(kāi)始階段(飽水0~5天)→軟化持續(xù)階段(飽水5~30天)→軟化穩(wěn)定階段(飽水30~60天)。
[Abstract]:The research area is located on the east side of the 12 # landslide of Panzhihua Airport. The bedrock of the site is mainly of the mudstone section of the Triassic Baoding Formation, mainly of the carbonaceous mudstone, with sandstone and silty mudstone. The underlying bedrock of the old landslide of the 10 # landslide and the lower Yijiaping landslide is mainly distributed with mudstone. The filling material is taken from the mudstone section of the Baoding Formation and contains a large amount of mudstone and fragment debris. It is clear that the failure of the filling body and the revival of the old landslide at the Panzhihua Airport are related to the softening of the mudstone. Therefore, a series of experiments have been carried out on the characteristics of the water softening of mudstone in the area, and the following understandings are drawn: (1) The initial component and structure of the mudstone are mudstone (block), and the surface of the mudstone is on the basis of water softening. The mudstone of the study area is mainly composed of clay minerals, organic minerals, simple salts and carbonaceous materials. In which the content of clay mineral accounts for 50-95%, the mineral content is 4-35%, and most of the simple salts are soluble salts. The carbonaceous content is from 1% to 10%, and the clay mineral is intermixed, and the connection between the clay mineral particles is reduced. From the microstructure, the clay mineral is a cryptocrystalline-microcrystalline aggregate, a parallel stack structure, and a solid salt is cemented between the clay mineral and the mineral particle. The above initial component structure determines that the natural strength of the mudstone in the study area is not high (the uniaxial compressive strength is less than 10MPa), the water stability is poor, and the softening property is strong. (2) The pure water soaking test shows that: (1) The water content and porosity of the mudstone (block) in the study area are continuously increasing in the water-saturated process, and the uniaxial compressive strength and the anti-shear strength show a continuous attenuation trend; after 30 days of saturation, the water content and the porosity of the mudstone are increased by 122.77%, respectively. 142.72%; single-axis compressive strength decreased by 81%, c, f value decreased by 67.86% and 53.12%, respectively; (2) the change tendency of the physical and mechanical properties of the mudstone structural plane was generally the same as that of the mudstone (block), but it was more severe than water and the softening process was faster. The anti-shear strength index is stable after 10 days of water saturation. After 30 days of water saturation, the water content and porosity increased by 166.67%, 195.97%, c, and f respectively by 63.27% and 41.67%, respectively. (3) The infiltration of mudstone has distinct characteristics of the opposite sex. In the non-stress state, the rate of water content, porosity and infiltration depth of the parallel bedding surface in the infiltration direction is higher than that of the vertical bedding plane. At different shear stress levels, the depth of infiltration along the direction of shear (potential destruction), the water content and porosity of the upper and lower test blocks increase with the increase of the shear stress level, the infiltration depth, the water content and the porosity in the parallel bedding of the shear plane are greater than that of the vertical plane shear. And the difference between the two stress levels is relatively large, and the difference between the two stress levels is small. (4) The effect of groundwater and stress is the main external factor leading to the softening of mudstone. Using the groundwater in the study area as the soak solution, the dissolution and precipitation of the chemical components of the mudstone are restrained to a certain extent, and the softening degree of the mechanical properties of the mudstone is less than that of the pure water soaking solution. In addition, under a certain stress, not only can the structural connection between the mudstone mineral particles be weakened directly, but also the micro-cracks are generated, which is beneficial to the immersion of the underground water, thereby increasing the softening process of the mudstone. (5) There are four physical and chemical functions of the softening of the mudstone in the study area: the first is the chemical dissolution which is characterized by the dissolution of the solid soluble salt; the second is the wedge action of the process of increasing the dissolution of the mudstone and the increase of the porosity; the third is the hydrolysis of the muscovite and the feldspar in the mudstone; And fourth, the lubricating effect of water. in which, the chemical corrosion action is main, and decreases with the increase of the water-saturated time, the wedge action mainly occurs in the middle and late period of water-saturated water (that is, the chemical dissolution is carried out to a certain degree), the hydrolysis effect is relatively weak, The lubrication effect mainly exists in the case of the through-crack (such as the case of the mudstone structure surface). (6) The softening process of the mudstone (block) and the structural surface is generally divided into three processes. Mudstone (block): softening start phase (water-saturated for 0-10 days), softening and steady phase (water-saturated for 10-30 days), softening and stabilizing phase (water-saturated for 30-60 days); mudstone structure surface: softening-start phase (water-saturated for 0-5 days) and softening-lasting stage (water-saturated for 5-30 days) and softening and stabilizing stage (water-saturated for 30-60 days).
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU45;V351.1
本文編號(hào)：2441059
[Abstract]:The research area is located on the east side of the 12 # landslide of Panzhihua Airport. The bedrock of the site is mainly of the mudstone section of the Triassic Baoding Formation, mainly of the carbonaceous mudstone, with sandstone and silty mudstone. The underlying bedrock of the old landslide of the 10 # landslide and the lower Yijiaping landslide is mainly distributed with mudstone. The filling material is taken from the mudstone section of the Baoding Formation and contains a large amount of mudstone and fragment debris. It is clear that the failure of the filling body and the revival of the old landslide at the Panzhihua Airport are related to the softening of the mudstone. Therefore, a series of experiments have been carried out on the characteristics of the water softening of mudstone in the area, and the following understandings are drawn: (1) The initial component and structure of the mudstone are mudstone (block), and the surface of the mudstone is on the basis of water softening. The mudstone of the study area is mainly composed of clay minerals, organic minerals, simple salts and carbonaceous materials. In which the content of clay mineral accounts for 50-95%, the mineral content is 4-35%, and most of the simple salts are soluble salts. The carbonaceous content is from 1% to 10%, and the clay mineral is intermixed, and the connection between the clay mineral particles is reduced. From the microstructure, the clay mineral is a cryptocrystalline-microcrystalline aggregate, a parallel stack structure, and a solid salt is cemented between the clay mineral and the mineral particle. The above initial component structure determines that the natural strength of the mudstone in the study area is not high (the uniaxial compressive strength is less than 10MPa), the water stability is poor, and the softening property is strong. (2) The pure water soaking test shows that: (1) The water content and porosity of the mudstone (block) in the study area are continuously increasing in the water-saturated process, and the uniaxial compressive strength and the anti-shear strength show a continuous attenuation trend; after 30 days of saturation, the water content and the porosity of the mudstone are increased by 122.77%, respectively. 142.72%; single-axis compressive strength decreased by 81%, c, f value decreased by 67.86% and 53.12%, respectively; (2) the change tendency of the physical and mechanical properties of the mudstone structural plane was generally the same as that of the mudstone (block), but it was more severe than water and the softening process was faster. The anti-shear strength index is stable after 10 days of water saturation. After 30 days of water saturation, the water content and porosity increased by 166.67%, 195.97%, c, and f respectively by 63.27% and 41.67%, respectively. (3) The infiltration of mudstone has distinct characteristics of the opposite sex. In the non-stress state, the rate of water content, porosity and infiltration depth of the parallel bedding surface in the infiltration direction is higher than that of the vertical bedding plane. At different shear stress levels, the depth of infiltration along the direction of shear (potential destruction), the water content and porosity of the upper and lower test blocks increase with the increase of the shear stress level, the infiltration depth, the water content and the porosity in the parallel bedding of the shear plane are greater than that of the vertical plane shear. And the difference between the two stress levels is relatively large, and the difference between the two stress levels is small. (4) The effect of groundwater and stress is the main external factor leading to the softening of mudstone. Using the groundwater in the study area as the soak solution, the dissolution and precipitation of the chemical components of the mudstone are restrained to a certain extent, and the softening degree of the mechanical properties of the mudstone is less than that of the pure water soaking solution. In addition, under a certain stress, not only can the structural connection between the mudstone mineral particles be weakened directly, but also the micro-cracks are generated, which is beneficial to the immersion of the underground water, thereby increasing the softening process of the mudstone. (5) There are four physical and chemical functions of the softening of the mudstone in the study area: the first is the chemical dissolution which is characterized by the dissolution of the solid soluble salt; the second is the wedge action of the process of increasing the dissolution of the mudstone and the increase of the porosity; the third is the hydrolysis of the muscovite and the feldspar in the mudstone; And fourth, the lubricating effect of water. in which, the chemical corrosion action is main, and decreases with the increase of the water-saturated time, the wedge action mainly occurs in the middle and late period of water-saturated water (that is, the chemical dissolution is carried out to a certain degree), the hydrolysis effect is relatively weak, The lubrication effect mainly exists in the case of the through-crack (such as the case of the mudstone structure surface). (6) The softening process of the mudstone (block) and the structural surface is generally divided into three processes. Mudstone (block): softening start phase (water-saturated for 0-10 days), softening and steady phase (water-saturated for 10-30 days), softening and stabilizing phase (water-saturated for 30-60 days); mudstone structure surface: softening-start phase (water-saturated for 0-5 days) and softening-lasting stage (water-saturated for 5-30 days) and softening and stabilizing stage (water-saturated for 30-60 days).
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU45;V351.1
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