本文選題：膠結(jié)充填體　切入點(diǎn)：早強(qiáng)劑　出處：《江西理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在分層充填采礦技術(shù)中,提高充填體早期強(qiáng)度對(duì)提高礦山安全程度、縮短采充循環(huán)間隔時(shí)間具有重要意義,工程實(shí)際中可通過(guò)摻入早強(qiáng)劑,提高充填體早期強(qiáng)度。但充填體在養(yǎng)護(hù)期間,除承受自重、圍壓、頂壓等靜態(tài)載荷外,還承受爆破振動(dòng)、沖擊等動(dòng)態(tài)載荷。本文針對(duì)摻早強(qiáng)劑全尾砂膠結(jié)充填體的動(dòng)、靜態(tài)力學(xué)特性開(kāi)展室內(nèi)試驗(yàn)研究。主要研究?jī)?nèi)容如下:(1)設(shè)計(jì)了32組不同早強(qiáng)劑摻量(0.0%、0.3%、0.6%、0.9%)、不同養(yǎng)護(hù)齡期(3d、7d、14d、28d)、不同試件高度(靜載100mm、動(dòng)載50mm)的膠結(jié)充填體動(dòng)、靜載力學(xué)特性試驗(yàn),動(dòng)載試驗(yàn)采用分離式SHPB試驗(yàn)裝置,靜載試驗(yàn)采用RMT~(-1)50巖石力學(xué)材料試驗(yàn)機(jī)。(2)靜載條件下:充填體的抗壓強(qiáng)度隨齡期增加呈對(duì)數(shù)增大,彈性模量也隨齡期增加而增大,應(yīng)變則隨齡期增加而減小。3天和7天時(shí),早強(qiáng)劑對(duì)充填體力學(xué)特性的影響相似,隨早強(qiáng)劑摻量增加,抗壓強(qiáng)度增大、彈性模量增大、應(yīng)變減小,且變化幅度均在早強(qiáng)劑摻量0.3%~0.6%時(shí)最大;但3天時(shí)早強(qiáng)劑對(duì)充填體抗壓強(qiáng)度、彈性模量影響更顯著,摻量為0.3%、0.6%、0.9%的充填體抗壓強(qiáng)度分別提高了1.3、1.42、1.54倍,彈性模量分別提高了1.07、1.68、1.84倍。14天時(shí),早強(qiáng)劑對(duì)各項(xiàng)充填體力參數(shù)影響不明顯。28天時(shí),早強(qiáng)劑摻量0.6%~0.9%的充填體抗壓強(qiáng)度低于未添加早強(qiáng)劑組。(3)動(dòng)載條件下:不同應(yīng)變率時(shí),動(dòng)載抗壓強(qiáng)度總體上隨應(yīng)變率增大呈指數(shù)增長(zhǎng)關(guān)系,在7天前充填體動(dòng)態(tài)強(qiáng)度對(duì)應(yīng)變率的敏感較大,隨著齡期的增長(zhǎng)逐漸減小;且當(dāng)應(yīng)變率低于10 S~(-1)時(shí)充填體穩(wěn)定性較好,25 S~(-1)時(shí)試件有一定的損傷裂紋,大于35 S~(-1)時(shí)裂為兩塊并產(chǎn)生貫通裂紋試件完全失穩(wěn)。入射能與應(yīng)變率相似,充填體單位體積吸收能與齡期呈對(duì)數(shù)增長(zhǎng)關(guān)系。充填體的動(dòng)載強(qiáng)度與齡期呈對(duì)數(shù)增長(zhǎng)關(guān)系,變化趨勢(shì)與靜載相似,但動(dòng)載強(qiáng)度更高,強(qiáng)度提高因子為1.37~2.35。早強(qiáng)劑對(duì)充填體力學(xué)特性的影響規(guī)律與靜載相似,隨早強(qiáng)劑摻量增加,充填體的動(dòng)載強(qiáng)度增大、彈性模量增大、單位體積吸收能增大、峰值應(yīng)變減小。3天時(shí)變化最顯著,早強(qiáng)劑摻量為0.3%、0.6%、0.9%,充填體動(dòng)載強(qiáng)度分別提高了1.23、1.36、1.48倍;彈性模量分別提高了1.33、2.44、3.53倍;單位體積吸收能增大了1.5、1.92、2倍;峰值應(yīng)變分別減小了1.25、1.28、1.85倍。
[Abstract]:In the technology of stratified filling mining, it is very important to improve the safety degree of mine and shorten the interval time between mining and filling by increasing the early strength of the filling body. In engineering practice, the early strength agent can be added into it. But during the curing period, the filling body not only bears static loads such as self-weight, confining pressure and top pressure, but also bears dynamic loads such as blasting vibration and impact. The main contents of this study are as follows: (1) A total of 32 groups of cemented fillers with different dosages of different early strength agents (0.00. 3 and 0. 6 and 0. 9), different curing ages of 7 days, 14 days and 28 days, and different specimen heights (static load of 100 mm, dynamic load of 50 mm) were designed to test the dynamic and static mechanical properties of cemented filling body. Under static loading conditions, the compressive strength of the filling body increases logarithmically with the increase of age, and the elastic modulus increases with the increase of age. The effect of early strength agent on the mechanical properties of filling was similar with the increase of age, and the compressive strength, elastic modulus and strain decreased with the increase of the content of early strength agent. The range of variation was the largest in the range of 0.3 ~ 0.6 of early strength agent, but the effect of early strength on the compressive strength and elastic modulus of the filling was more significant at 3 days, and the compressive strength of the filling body with 0.30.36% was increased by 1.54 times, respectively. When the elastic modulus was increased by 1.07 ~ 1.68 ~ 1.84 times 路14 days, and the influence of early strength agent on the filling physical parameters was not obvious at 28 days, the compressive strength of the filling body with 0.6% of the early strength agent was lower than that of the group without the early strength agent. The compressive strength of dynamic load increases exponentially with the increase of strain rate. The dynamic strength of filling body is sensitive to strain rate 7 days ago, and decreases gradually with the increase of age. When the strain rate is lower than 10 S-1), the stability of the backfill is better than that of the strain rate. When the strain rate is less than 10 S-1), the specimen has a certain damage crack, but when the strain rate is greater than 35 S-1, the specimen is broken into two pieces and the through crack specimen is completely unstable. The incident energy is similar to the strain rate, and the strain rate is similar to the incident energy, and the incident energy is similar to the strain rate. The absorption energy per unit volume of the filling body is logarithmic increasing with the age. The dynamic load strength of the filling body is logarithmic increasing with the age, and the changing trend is similar to that of the static load, but the dynamic load intensity is higher. The strength improvement factor is 1.37 ~ 2.35. The effect of early strength agent on the physical properties of filling is similar to that of static load. With the increase of the content of early strength agent, the dynamic load strength, elastic modulus and absorption energy per unit volume increase. When the peak strain decreased by 3.3days, the peak strain changed most obviously. The dynamic load strength of the filling body increased by 1.231.36 ~ 1.48 times, the elastic modulus increased by 1.33 ~ 2.44 ~ 3.53 times, the unit volume absorption energy increased by 1.51.922 times, and the peak strain decreased by 1.25 ~ 1.28 ~ 1.85 times, respectively.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD853.34

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊曦;李巖;;巖石充填體耦合條件下沖擊破壞數(shù)值模擬分析[J];化工礦物與加工;2017年01期

2 張?jiān)迄i;楊曦;陳超;;不同沖擊速度下充填體破壞規(guī)律數(shù)值模擬研究[J];化工礦物與加工;2016年07期

3 侯志明;王新喬;侯志超;;下向分層膠結(jié)充填采礦法在我國(guó)巖金地下礦山的應(yīng)用[J];山東工業(yè)技術(shù);2016年05期

4 鄭娟榮;趙雪飛;谷迪;;早強(qiáng)劑對(duì)尾砂膠結(jié)膏體充填材料早期強(qiáng)度的影響[J];有色金屬(礦山部分);2016年01期

5 高慶偉;趙麗軍;孫嘉;王成財(cái);;空?qǐng)霾傻V法轉(zhuǎn)崩落采礦法過(guò)渡過(guò)程中主要結(jié)構(gòu)參數(shù)確定[J];黃金;2016年01期

6 陳寶寶;劉長(zhǎng)友;魯巖;;大斷面沿空留巷充填體穩(wěn)定性及留巷支護(hù)技術(shù)[J];煤炭技術(shù);2015年11期

7 袁璞;徐穎;;養(yǎng)護(hù)時(shí)間對(duì)膠結(jié)砂相似材料抗壓性能的影響[J];振動(dòng)與沖擊;2015年13期

8 王新民;張國(guó)慶;李帥;薛希龍;;高階段大跨度充填體穩(wěn)定性評(píng)估[J];中國(guó)安全科學(xué)學(xué)報(bào);2015年06期

9 李茂輝;楊志強(qiáng);高謙;王有團(tuán);;外加劑對(duì)新型全尾砂充填膠凝材料強(qiáng)度影響研究[J];礦業(yè)研究與開(kāi)發(fā);2015年05期

10 楊志強(qiáng);把多恒;王永定;高謙;;提高金川礦山下向采場(chǎng)采礦生產(chǎn)能力技術(shù)研究[J];有色金屬(礦山部分);2015年03期

相關(guān)博士學(xué)位論文 前2條

1 王世鳴;沖擊荷載下早齡期混凝土力學(xué)和損傷特性的試驗(yàn)研究[D];中南大學(xué);2014年

2 洪亮;沖擊荷載下巖石強(qiáng)度及破碎能耗特征的尺寸效應(yīng)研究[D];中南大學(xué);2008年

相關(guān)碩士學(xué)位論文 前1條

1 王勇;混凝土類材料在霍普金森桿實(shí)驗(yàn)中的受力狀態(tài)研究[D];北京理工大學(xué);2015年

，

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