本文選題：加卸載響應(yīng)比 + 地下洞室��； 參考：《湖南工業(yè)大學(xué)》2015年碩士論文

【摘要】：本文將加卸載響應(yīng)比理論引入到了地下洞室穩(wěn)定性分析中,將地下洞室視為一非線性系統(tǒng),建立了加卸載響應(yīng)模型。通過室內(nèi)試驗(yàn)、模型試驗(yàn)、數(shù)值模擬三者相結(jié)合的方法研究了加卸載響應(yīng)比理論評(píng)判地下洞室穩(wěn)定性的可行性。主要得出了如下幾個(gè)方面的結(jié)論和成果:(1)本文對(duì)巖樣進(jìn)行了兩種應(yīng)力路徑的加卸載試驗(yàn),一種是保持圍壓不變,軸向加卸載試驗(yàn);另一種是保持軸壓不變,圍壓加卸載試驗(yàn)。試驗(yàn)結(jié)果表明:第一種應(yīng)力路徑加卸載試驗(yàn),以軸向應(yīng)力作為L(zhǎng)URR系統(tǒng)輸入?yún)?shù),軸向應(yīng)變作為響應(yīng)指標(biāo),以此求出的加卸載響應(yīng)比值在巖石發(fā)生破壞前有“急劇增加-迅速回落”的過程,可根據(jù)這一現(xiàn)象來預(yù)測(cè)巖石的破壞。第二種應(yīng)力路徑下的加卸載試驗(yàn)中,以環(huán)向應(yīng)力作為L(zhǎng)URR系統(tǒng)輸入?yún)?shù),軸向應(yīng)變和環(huán)向應(yīng)變作為響應(yīng)指標(biāo),求出的加卸載響應(yīng)比值與第一種試驗(yàn)具有相同的規(guī)律。這表明,加卸載響應(yīng)比理論可用于預(yù)測(cè)巖樣的破壞。(2)通過模型試驗(yàn),運(yùn)用加卸載響應(yīng)比理論分析了巷道的穩(wěn)定性。研究表明,通過對(duì)地應(yīng)力進(jìn)行小幅度的增加或減小來實(shí)施加卸載,以拱頂位移和拱頂圍巖壓力作為響應(yīng)求出的響應(yīng)比值可較好的反映巷道的穩(wěn)定狀態(tài),在巷道破壞前兩者有急劇增大的過程,且具有較好的一致性;聲發(fā)射定位結(jié)果表明巷道邊墻處出現(xiàn)了聲發(fā)射事件大量聚集,巷道首先在此處破壞。(3)用RFPA軟件對(duì)模型試驗(yàn)進(jìn)行了數(shù)值模擬,將計(jì)算出的拱頂位移響應(yīng)特征和聲發(fā)射定位結(jié)果與實(shí)測(cè)數(shù)據(jù)進(jìn)行了對(duì)比,計(jì)算結(jié)果與模型試驗(yàn)結(jié)果較為吻合。
[Abstract]:In this paper, the load-unload response ratio theory is introduced into the stability analysis of underground caverns, which is regarded as a nonlinear system, and a load-unloading response model is established. The feasibility of evaluating the stability of underground cavern by the theory of loading and unloading response ratio is studied by the combination of laboratory test, model test and numerical simulation. In this paper, two kinds of stress path loading and unloading tests are carried out on rock samples, one is to keep the confining pressure constant, the other is to keep the axial pressure constant, and the other is to keep the axial pressure constant, the confining pressure loading and unloading tests. The test results show that the first stress path loading and unloading test takes axial stress as input parameter of LURR system and axial strain as response index. The ratio of loading and unloading response calculated by this method has a process of "sharp increase-drop quickly" before the failure of rock, which can be used to predict the failure of rock. In the loading and unloading test under the second stress path, the toroidal stress is used as the input parameter of the LURR system, and the axial strain and the circumferential strain are taken as the response indexes. The ratio of the loading and unloading response obtained is the same as that of the first test. This shows that the load-unloading response ratio theory can be used to predict the failure of rock samples. The research shows that by increasing or decreasing the in-situ stress in a small scale to carry out loading and unloading, the response ratio obtained by using the displacement of the arch roof and the pressure of the surrounding rock of the arch roof as the response can better reflect the stable state of the roadway. The results of acoustic emission localization show that a large number of acoustic emission events gather at the side wall of roadway. The numerical simulation of the model test is carried out by using RFPA software. The calculated displacement response characteristics of the arch roof and the acoustic emission location results are compared with the measured data, and the calculated results are in good agreement with the model test results.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD311

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉阜羊;朱珍德;孫少銳;;塊體理論及其在洞室圍巖穩(wěn)定分析中的應(yīng)用[J];地下空間與工程學(xué)報(bào);2006年S2期

2 李鐵;孫學(xué)會(huì);呂毓國;盛繼權(quán);梅亭亭;;基于巖體加卸載響應(yīng)原理的強(qiáng)礦震危險(xiǎn)性預(yù)測(cè)[J];北京科技大學(xué)學(xué)報(bào);2011年11期

3 楊宇江;莊文廣;王照亞;李元輝;;基于強(qiáng)度折減法的地下采場(chǎng)穩(wěn)定性分析[J];東北大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年06期

4 尹祥礎(chǔ)，，陳學(xué)忠，宋治平，尹燦;加卸載響應(yīng)比──一種新的地震預(yù)報(bào)方法[J];地球物理學(xué)報(bào);1994年06期

5 許強(qiáng),黃潤秋;考慮地應(yīng)力的洞室圍巖塊體穩(wěn)定性分析的理論與實(shí)踐[J];地質(zhì)災(zāi)害與環(huán)境保護(hù);1996年04期

6 施行覺;趙闖;李成波;溫丹;;巖石蠕變破裂過程及其響應(yīng)比變化的實(shí)驗(yàn)研究[J];地震學(xué)報(bào);2010年03期

7 鄔凱;盛謙;張勇慧;;基于加卸載響應(yīng)比理論的降雨型滑坡預(yù)警研究[J];防災(zāi)減災(zāi)工程學(xué)報(bào);2011年06期

8 趙瑜;盧義玉;康勇;;隧道圍巖卸荷演化過程的Kolmogorov熵分析[J];重慶大學(xué)學(xué)報(bào);2009年09期

9 尹祥礎(chǔ);張浪平;張暉輝;尹燦;王裕倉;張永仙;彭克銀;王海濤;宋治平;余懷忠;莊建倉;;加卸載響應(yīng)比20年及其展望[J];國際地震動(dòng)態(tài);2008年04期

10 汪成兵;劉豐軍;王士民;;基于三維有限元分析的隧道開挖效應(yīng)研究[J];公路;2007年02期

本文編號(hào)：1999224