本文選題：膠結(jié)充填體　切入點：早強劑　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,提高充填體早期強度對提高礦山安全程度、縮短采充循環(huán)間隔時間具有重要意義,工程實際中可通過摻入早強劑,提高充填體早期強度。但充填體在養(yǎng)護期間,除承受自重、圍壓、頂壓等靜態(tài)載荷外,還承受爆破振動、沖擊等動態(tài)載荷。本文針對摻早強劑全尾砂膠結(jié)充填體的動、靜態(tài)力學(xué)特性開展室內(nèi)試驗研究。主要研究內(nèi)容如下:(1)設(shè)計了32組不同早強劑摻量(0.0%、0.3%、0.6%、0.9%)、不同養(yǎng)護齡期(3d、7d、14d、28d)、不同試件高度(靜載100mm、動載50mm)的膠結(jié)充填體動、靜載力學(xué)特性試驗,動載試驗采用分離式SHPB試驗裝置,靜載試驗采用RMT~(-1)50巖石力學(xué)材料試驗機。(2)靜載條件下:充填體的抗壓強度隨齡期增加呈對數(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,早強劑對充填體力學(xué)特性的影響相似,隨早強劑摻量增加,抗壓強度增大、彈性模量增大、應(yīng)變減小,且變化幅度均在早強劑摻量0.3%~0.6%時最大;但3天時早強劑對充填體抗壓強度、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,早強劑對各項充填體力參數(shù)影響不明顯。28天時,早強劑摻量0.6%~0.9%的充填體抗壓強度低于未添加早強劑組。(3)動載條件下:不同應(yīng)變率時,動載抗壓強度總體上隨應(yīng)變率增大呈指數(shù)增長關(guān)系,在7天前充填體動態(tài)強度對應(yīng)變率的敏感較大,隨著齡期的增長逐漸減小;且當應(yīng)變率低于10 S~(-1)時充填體穩(wěn)定性較好,25 S~(-1)時試件有一定的損傷裂紋,大于35 S~(-1)時裂為兩塊并產(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數(shù)增長關(guān)系。充填體的動載強度與齡期呈對數(shù)增長關(guān)系,變化趨勢與靜載相似,但動載強度更高,強度提高因子為1.37~2.35。早強劑對充填體力學(xué)特性的影響規(guī)律與靜載相似,隨早強劑摻量增加,充填體的動載強度增大、彈性模量增大、單位體積吸收能增大、峰值應(yīng)變減小。3天時變化最顯著,早強劑摻量為0.3%、0.6%、0.9%,充填體動載強度分別提高了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)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD853.34

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