本文選題：鐵磁質(zhì)巖石 + 加熱��； 參考：《東北大學(xué)》2014年碩士論文

【摘要】：巖石圈是人類賴以生存的地方,隨著經(jīng)濟(jì)的不斷發(fā)展,人類開始發(fā)展地下空間,由于地下圍巖失穩(wěn)、隧道塌方及洞室?guī)r爆等地下工程問題的發(fā)生,直接影響著人類的生命及財(cái)產(chǎn)安全,因此了解在應(yīng)力作用下巖石內(nèi)部微裂隙的變化過程及規(guī)律對(duì)保證工程安全具有重大意義。本論文主要是研究鐵磁質(zhì)巖石試件擠壓破壞全過程中,應(yīng)力、應(yīng)變和磁感應(yīng)強(qiáng)度之間的關(guān)系,通過分析應(yīng)力-應(yīng)變-磁感應(yīng)強(qiáng)度曲線,獲得鐵磁質(zhì)巖石試件擠壓破壞的前兆。本試驗(yàn)巖石采自于遼寧省遼陽市弓長(zhǎng)嶺礦,巖石本身帶有磁場(chǎng),并且強(qiáng)度符合試驗(yàn)量程,對(duì)其加工制作成標(biāo)準(zhǔn)的圓柱體試件。此巖石源自于偌大巖石圈的一小部分,巖石內(nèi)部缺失較小的微裂隙,本試驗(yàn)根據(jù)巖石內(nèi)部熱膨脹各向異性等,對(duì)鐵磁質(zhì)巖石試件加熱以增加巖石內(nèi)部的微小裂隙,通過加載系統(tǒng)和雙通道數(shù)據(jù)采集系統(tǒng),對(duì)加熱處理后的試件進(jìn)行單軸擠壓試驗(yàn)和實(shí)時(shí)監(jiān)測(cè),獲得應(yīng)力、應(yīng)變和磁感應(yīng)強(qiáng)度三者之間的對(duì)應(yīng)關(guān)系,將巖石力學(xué)物理參數(shù)與磁學(xué)物理參數(shù)聯(lián)系起來,形成一種巖石擠壓破壞過程微觀變化的磁性測(cè)試方法。對(duì)鐵磁質(zhì)巖石試件擠壓破壞試驗(yàn),經(jīng)過數(shù)據(jù)處理和分析,獲得巖石試件擠壓破壞過程中的應(yīng)力、應(yīng)變和磁感應(yīng)強(qiáng)度三者之間的關(guān)系曲線,總結(jié)出鐵磁質(zhì)巖石試件擠壓破壞全過程巖石磁感應(yīng)強(qiáng)度的變化規(guī)律和試件臨界破壞時(shí)磁感應(yīng)強(qiáng)度變化異常特征。試驗(yàn)結(jié)果表明：在應(yīng)力上升階段,隨著應(yīng)變的增加,應(yīng)力增加,磁強(qiáng)變�。辉谒芰鞫�,應(yīng)力幾乎保持不變,磁強(qiáng)發(fā)生了三種突變,一是由下降轉(zhuǎn)變?yōu)樯仙?二是磁感應(yīng)強(qiáng)度變化趨于平緩,三是磁感應(yīng)強(qiáng)度突然快速下降；試件破壞后,隨著應(yīng)變的增加應(yīng)力變小,磁強(qiáng)發(fā)生上升或趨于平緩。選用加熱溫度為700℃-600℃-700℃三次重復(fù)加熱和300℃-600℃-500℃三次重復(fù)加熱后,經(jīng)過擠壓破壞實(shí)驗(yàn)后,鐵磁質(zhì)巖石試件可以實(shí)現(xiàn)充分破壞。
[Abstract]:The lithosphere is the place on which human beings depend for survival. With the development of economy, human beings begin to develop underground space. Due to the instability of underground surrounding rock, tunnel collapse and cave rockburst, etc, underground engineering problems occur.The safety of human life and property is directly affected, so it is of great significance to understand the changing process and law of microcracks in rock under stress to ensure the safety of engineering.In this paper, the relationship between stress, strain and magnetic induction strength in the whole process of extrusion failure of ferromagnetic rock specimen is studied. By analyzing the stress-strain-magnetic induction intensity curve, the precursor of extrusion failure of ferromagnetic rock specimen is obtained.The test rock was collected from Gongchangling Mine in Liaoyang City Liaoning Province. The rock itself has magnetic field and its strength accords with the test range.The rock is derived from a small part of the huge lithosphere, and there is a small microcrack missing in the rock. According to the anisotropy of thermal expansion inside the rock, the specimen of ferromagnetic rock is heated to increase the tiny fissure inside the rock.Through loading system and two-channel data acquisition system, uniaxial extrusion test and real-time monitoring of the heated specimen are carried out, and the corresponding relationship among stress, strain and magnetic induction intensity is obtained.The rock mechanics and physical parameters are connected with the magnetic physical parameters to form a magnetic measurement method for the microscopic change of rock extrusion failure process.Through data processing and analysis, the relationship curves between stress, strain and magnetic induction strength during the extrusion failure of ferromagnetic rock specimens are obtained.The variation law of magnetic induction intensity of ferromagnetic rock specimen during the whole process of extrusion failure and the abnormal characteristics of magnetic induction intensity variation during critical failure of the specimen are summarized.The test results show that in the stress rising stage, the stress increases with the increase of strain, and the magnetic intensity becomes smaller; in the plastic flow section, the stress almost remains the same, and the magnetic intensity has three kinds of abrupt changes, one is from decreasing to increasing.Second, the change of magnetic induction intensity tends to be gentle, and the third is the sudden and rapid decrease of magnetic induction intensity; after the specimen is destroyed, the magnetic intensity increases or tends to be gentle with the increase of strain and the stress becomes smaller.When the heating temperature is 700 鈩，

本文編號(hào)：1735829