【摘要】：隨著工程技術(shù)水平的不斷提高,資源開發(fā)、水利、交通等與地下工程密切相關(guān)事業(yè)的飛躍發(fā)展,地下工程的空間與數(shù)量在日益增多。地下工程不可避免受到溫度的影響,地下高溫不僅影響工程施工安全和進(jìn)度,而且由于產(chǎn)生的附加溫度應(yīng)力還將引起襯砌開裂,從而影響隧洞的穩(wěn)定性。本文結(jié)合孔莊煤礦和趙樓煤礦的實(shí)地?cái)?shù)據(jù),對(duì)其進(jìn)行計(jì)算機(jī)回歸分析,從而獲得不同礦井的地溫梯度。經(jīng)過(guò)分析可知:趙樓煤礦平均地溫梯度G=5.23℃/100m,孔莊煤礦平均地溫梯度G=0.49℃/100m,比較兩個(gè)煤礦得出由于巖性不同有不同的地溫梯度。通過(guò)對(duì)孔莊煤礦工作面監(jiān)測(cè),得出7432工作面監(jiān)測(cè)實(shí)際最大變形量為26mm,7435溜子道監(jiān)測(cè)實(shí)際最大變形量為16mm,實(shí)際測(cè)量應(yīng)力最大值為6.7MPa。充分考慮現(xiàn)場(chǎng)的具體情況,運(yùn)用有限元軟件ANSYS對(duì)地下巷道圍巖溫度變化進(jìn)行模擬,得到20℃~35℃的溫度場(chǎng)分布;得到20℃~35℃的熱應(yīng)變分布情況,最大熱應(yīng)變?yōu)?.496mm;得到20℃~35℃熱應(yīng)力分布情況,最大應(yīng)力為1.84MPa;得到20℃~35℃熱-力耦合模擬的分布情況,最大變形量為31.038mm。由于采取了通風(fēng)等降溫措施,使得實(shí)際測(cè)量值小于理論計(jì)算值。通過(guò)理論計(jì)算和實(shí)際監(jiān)測(cè)情況綜合對(duì)比,在實(shí)際的工程應(yīng)用中,應(yīng)控制工程環(huán)境的溫度來(lái)影響圍巖的溫度,進(jìn)而使圍巖穩(wěn)定性的溫度效應(yīng)在能夠可接受的范圍之內(nèi)。通過(guò)本文分析,結(jié)合數(shù)值模擬結(jié)果,得出了孔莊煤礦和趙樓煤礦的地溫梯度,討論了不同溫度下的圍巖穩(wěn)定性,為地下工程的施工防護(hù)提供參考。
[Abstract]:With the continuous improvement of engineering technology and the rapid development of resources exploitation, water conservancy, transportation and other closely related undertakings, the space and quantity of underground engineering are increasing day by day. The underground engineering is inevitably affected by the temperature. The underground high temperature not only affects the construction safety and progress of the project, but also causes the lining cracking due to the additional temperature stress, thus affecting the stability of the tunnel. Based on the field data of Kongzhuang coal mine and Zhaolou coal mine, computer regression analysis is carried out to obtain the geothermal gradient of different mines. Through the analysis, we can know that the average geothermal gradient of Zhaolu coal mine is 5.23 鈩，

本文編號(hào)：2315450