本文關(guān)鍵詞： 循環(huán)加卸載 應(yīng)力-應(yīng)變曲線 散粒體 力學(xué)模型 臨時(shí)支護(hù)　出處：《安徽理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在生活中我們經(jīng)常見到臨時(shí)支護(hù)設(shè)備,在橋梁、建筑、隧道和煤礦上都有著廣泛的應(yīng)用,生活中最常見的就是沙箱式臨時(shí)支座,它利用封閉容器內(nèi)的干燥細(xì)沙,在容器底部或側(cè)面打開開口時(shí)易流出從而減少容器內(nèi)的細(xì)沙體積的原理設(shè)計(jì)的。不同的蓋梁可以用沙箱內(nèi)沙子的多少來(lái)調(diào)整高度。在其他工序完成之后,需要將臨時(shí)支座的大梁放置到永久支座上時(shí)只需將沙箱一側(cè)的螺旋開關(guān)擰開,輕輕敲擊,沙子就會(huì)流出,大梁就會(huì)隨沙箱內(nèi)沙子的減少在自重作用下落到永久支座上,即方便、又簡(jiǎn)單。但是依舊有著其缺點(diǎn)和不足：沙粒的選擇依據(jù)、厚度的大小及應(yīng)力不穩(wěn)定的時(shí)候沙子所能承受的最大應(yīng)力等問(wèn)題。解決這些問(wèn)題具有重要理論參考價(jià)值和工程借鑒意義。 以沙子作為充填材料并對(duì)其進(jìn)行循環(huán)加卸載實(shí)驗(yàn),采用實(shí)驗(yàn)中常用的控制變量法,研究的3個(gè)變量分別是：粒徑、厚度、加載方式,研究其力學(xué)性質(zhì),抗壓強(qiáng)度,破壞程度,尋找出所承受的力、側(cè)限和研究變量的關(guān)系,實(shí)驗(yàn)使用RMT-150B試驗(yàn)機(jī),做單軸壓縮,采用循環(huán)加卸載實(shí)驗(yàn)；研究沙子在循環(huán)加載的條件下的力學(xué)性質(zhì),實(shí)驗(yàn)中再次使用到其他的參數(shù),例如表觀密度,堆積密度,加載速率這些參數(shù)始終貫穿始終；采用不同粒徑厚度的沙子,進(jìn)行循環(huán)加卸載實(shí)驗(yàn),研究沙粒的循環(huán)加卸載最大多能承受得住應(yīng)力強(qiáng)度,及沙子的應(yīng)力應(yīng)變關(guān)系,統(tǒng)計(jì)出不同粒徑的強(qiáng)度規(guī)律,及繪制出應(yīng)力應(yīng)變曲線及彈性模量,泊松比等一系列的參數(shù)；希望可以進(jìn)一步的完善；臨時(shí)支護(hù)設(shè)備提供參考和依據(jù)。并建立模型： (1)等量循環(huán)加卸載應(yīng)力應(yīng)變曲線方程。 (2)相同粒徑不同厚度條件下循環(huán)次數(shù)和軸向變形之間的模型。 (3)相同厚度不同粒徑條件下循環(huán)次數(shù)和軸向變形之間的模型。
[Abstract]:We often see temporary support equipment in our lives. It is widely used in bridges, buildings, tunnels and coal mines. The most common in life is the temporary support of sand box, which uses dry sand in closed containers. Designed to reduce the volume of fine sand in the container by opening the opening at the bottom or side of the container. Different cover beams can be adjusted with the amount of sand in the sand box. After other processes are completed, When it is necessary to place the beam of the temporary support on the permanent support, just unscrew the spiral switch on one side of the sand box, tap lightly, the sand will flow out, and the beam will fall to the permanent support with the decrease of sand in the sand box, that is, it is convenient. And simple. But still has its shortcomings and shortcomings: the basis for the selection of sand, The magnitude of thickness and the maximum stress that the sand can bear when the stress is unstable has important theoretical reference value and engineering reference value to solve these problems. Sand is used as filling material and cyclic loading and unloading experiments are carried out. Three variables are studied: particle size, thickness, loading mode, mechanical properties, compressive strength, and damage degree, using the control variable method commonly used in the experiment. To find out the relationship between the force, the side limit and the research variables, the experiment uses RMT-150B testing machine, makes uniaxial compression, uses cyclic loading and unloading experiments, studies the mechanical properties of sand under cyclic loading. Other parameters, such as apparent density, packing density, loading rate, are used again throughout the experiment, and cyclic loading and unloading experiments are carried out using sand with different particle sizes. A series of parameters, such as stress-strain curve, elastic modulus and Poisson's ratio, are obtained by studying the maximum load-unloading capacity of sand under cyclic loading and unloading, and the relationship between stress and strain, and the relationship between stress and strain, and the relationship between stress and strain, as well as the relationship between stress and strain, as well as the relationship between stress and strain. Hope can be further improved; temporary support equipment to provide reference and basis. And establish the model:. 1) the stress-strain curve equation of constant cyclic loading and unloading. (2) the model of cycle number and axial deformation under the same particle size and different thickness. (3) the model of cycle number and axial deformation under the same thickness and different particle size.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD350

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