本文選題：樹(shù)脂錨桿　切入點(diǎn)：水泥-泥巖混合試件　出處：《安徽理工大學(xué)》2017年碩士論文

【摘要】：樹(shù)脂錨桿支護(hù)作為煤礦巷道主要支護(hù)方式,隨著開(kāi)采的不斷推進(jìn),受深部礦井中復(fù)雜的地質(zhì)條件、施工工藝及錨桿錨固材料等因素的影響,巷道中樹(shù)脂錨桿支護(hù)問(wèn)題頻現(xiàn)。為進(jìn)一步了解錨桿錨固機(jī)理,分析不同影響因素對(duì)樹(shù)脂錨桿錨固性能影響及錨固界面剪應(yīng)力分布規(guī)律。本文首先采用理論研究方法簡(jiǎn)單分析錨桿錨固機(jī)理,然后由室內(nèi)試驗(yàn)著重研究了不同溫度對(duì)樹(shù)脂錨桿錨固性能力學(xué)特性影響,最后利用數(shù)值模擬FLAC3D模擬了不同溫度環(huán)境下錨桿錨固力學(xué)行為。主要的研究成果有幾個(gè)方面:(1)通過(guò)力學(xué)試驗(yàn)獲取千米深礦井泥巖相關(guān)力學(xué)參數(shù),然后配比不同比例的水泥-泥巖混合試件并對(duì)其力學(xué)參數(shù)進(jìn)行試驗(yàn)測(cè)定。試驗(yàn)結(jié)果發(fā)現(xiàn):水灰比為1:4,當(dāng)水泥和泥巖的混合比例接近1:1時(shí),混和試件的力學(xué)性質(zhì)和原巖最為接近。(2)按照泥巖和水泥確定的混合比例,制作錨桿錨固混合試件模型。在不同溫度下對(duì)試件單軸壓縮試驗(yàn)結(jié)果發(fā)現(xiàn):在25℃～60℃溫度區(qū)間內(nèi),錨固體強(qiáng)度隨溫度升高而衰減的速率約為0.74MPa/℃;錨固體的強(qiáng)度在25℃左右時(shí)最大,隨著溫度的升高,錨固體的強(qiáng)度越來(lái)越小,當(dāng)溫度達(dá)到45℃左右時(shí),錨固體強(qiáng)度衰減的速率變快,出現(xiàn)一定程度的軟化變形,當(dāng)溫度達(dá)到60℃時(shí),錨固體的強(qiáng)度只有25℃下的60%左右。(3)對(duì)不同溫度下錨固試件單軸壓縮試驗(yàn)錨桿桿體上應(yīng)變片數(shù)據(jù)處理分析:錨桿錨固界面上的剪應(yīng)力非均勻的分布在桿體軸向方向上,常溫狀態(tài)下,錨固界面上剪應(yīng)力在錨固壓縮端處較小,隨著距壓縮端距離的增加剪應(yīng)力值增大,在靠近錨固端遠(yuǎn)端達(dá)到峰值,之后錨桿剪應(yīng)力迅速減小,剪應(yīng)力分布特點(diǎn)為單峰值曲線,隨著溫度的升高,剪應(yīng)力曲線峰值點(diǎn)沿錨桿軸線方向向荷載端轉(zhuǎn)移。錨桿在鉆孔中的位置也會(huì)影響錨桿兩側(cè)剪應(yīng)力的分布。(4)運(yùn)用數(shù)值模擬FLAC3D軟件建立模型,分析了不同溫度環(huán)境相同加載荷載下下錨固體塑性區(qū)、錨固劑塑性區(qū)的分布特點(diǎn)以及錨桿軸向應(yīng)力、水平應(yīng)力的變化規(guī)律。
[Abstract]:As the main support method of coal mine roadway, resin bolt support is influenced by complicated geological conditions, construction technology and anchor material in deep mine with the development of mining. The problem of resin bolt support in roadway is frequent. In order to further understand the anchoring mechanism of bolt, The influence of different factors on the anchoring performance of resin bolt and the distribution of shear stress at the Anchorage interface are analyzed. Then, the effect of different temperature on the mechanical properties of resin anchor rod is studied in laboratory. Finally, numerical simulation FLAC3D is used to simulate the mechanical behavior of anchor bolt under different temperature environment. The main research results include several aspects: 1) the mechanical parameters related to mudstone in a mine with a depth of 1 km are obtained through mechanical tests. Then the mixed specimens with different ratio of cement and mudstone were tested and their mechanical parameters were measured. The results showed that the ratio of water to cement was 1: 4, when the ratio of cement to mudstone was close to 1:1, The mechanical properties of the mixed specimen are closest to the original rock. (2) according to the mixing ratio determined by mudstone and cement, the model of anchor bolt anchoring mixed specimen is made. The results of uniaxial compression test of the specimen at different temperatures show that: in the temperature range of 25 鈩，

本文編號(hào)：1681712