發(fā)布時間：2018-04-19 14:58

  本文選題：巖石力學 + 北山坑探設施��； 參考：《巖石力學與工程學報》2017年11期

【摘要】：為研究硬巖條件下巷道開挖圍巖內部位移變化特征,以高放廢物地質處置地下實驗室北山坑探設施為試驗平臺,設計原位試驗方案,開展圍巖內部位移現(xiàn)場量測試驗,分析巷道開挖全過程圍巖內部位移的演化特征,采用Lee方程、Hoek方程、V-D方程3個典型LDP曲線方程進行掌子面空間效應分析和損失位移求取。研究結果表明:北山花崗巖地質條件下,巷道爆破開挖全過程中,圍巖內部位移變化隨掌子面的推進呈現(xiàn)初始增長、快速增長和穩(wěn)定收斂3個階段;量測斷面附近的圍巖內部位移時態(tài)曲線呈現(xiàn)出階躍特征,與分級加載下巖石蠕變試驗曲線的形態(tài)特征相類似;距離巷道側壁較遠的測點受掌子面空間效應的影響范圍較小,且在掌子面前方產生的位移釋放量所占比重較大;采用Hoek方程求解的損失位移與實測值更為接近,為最優(yōu)求解方程;在距掌子面2 m遠設置量測斷面,其損失位移已占總位移的50%以上。研究結果可為后續(xù)地下實驗室開挖過程中的圍巖內部位移量測和分析提供借鑒與參考。
[Abstract]:In order to study the variation characteristics of internal displacement of surrounding rock excavated in roadway under hard rock condition, the in-situ test scheme was designed on the platform of Beishan pit exploration facility of underground laboratory for high-level radioactive waste geological disposal, and the in-situ displacement measurement test of surrounding rock was carried out.The evolutional characteristics of the internal displacement of surrounding rock during tunnel excavation are analyzed, and three typical LDP curve equations, Lee equation and V-D equation, are used to analyze the spatial effect of palm surface and calculate the loss displacement.The results show that: under the geological conditions of Beishan granite, during the whole process of roadway blasting excavation, the internal displacement changes of surrounding rock show three stages: initial growth, rapid growth and stable convergence with the advance of the face;The displacement temporal curve of surrounding rock near the measured section shows a step characteristic, which is similar to that of rock creep test curve under step loading, and the measuring point far away from the side wall of roadway is affected by the space effect of the side face of the roadway.The displacement released in front of the palm is larger, the loss displacement solved by the Hoek equation is closer to the measured value, and the measurement section is set up 2 m away from the palm face.Its loss displacement has accounted for more than 50% of the total displacement.The results can be used as reference for the measurement and analysis of the internal displacement of surrounding rock during the excavation of underground laboratory.
【作者單位】： 解放軍陸軍工程大學國防工程學院;南京城建項目建設管理有限公司;
【基金】：國家核設施退役及放射性廢物治理科研項目(FZ1402) 國家自然科學基金青年科學基金項目(51408605)~~
【分類號】：TD325

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