【摘要】：東灘煤礦1306軌道順槽掘進期間,實體煤幫出現(xiàn)大變形破壞,擠壓鼓出嚴重。采用離散元數(shù)值模擬分析了深井綜放沿空掘巷掘進期間基本頂斷裂位置的變化及圍巖應(yīng)力、位移的演化規(guī)律。揭示了實體煤幫大變形破壞機制:沿空掘巷誘發(fā)圍巖大結(jié)構(gòu)中關(guān)鍵塊體的回轉(zhuǎn)沉降,導(dǎo)致基本頂斷裂線向?qū)嶓w煤側(cè)轉(zhuǎn)移。頂板結(jié)構(gòu)的變化引起實體煤側(cè)支承壓力的顯著升高并產(chǎn)生大范圍的高應(yīng)力擠壓區(qū),使實體煤側(cè)表現(xiàn)出大變形與強流變的破壞特征�；趯嶓w煤幫變形破壞機制的分析,提出高強讓壓長錨索聯(lián)合錨網(wǎng)的實體煤幫控制技術(shù)。數(shù)值模擬與現(xiàn)場試驗表明,實體煤幫采用破斷力為600 kN,讓壓點為260~300 kN的φ22 mm×6800 mm長錨索加強支護后,水平大變形得到有效控制,實體煤幫變形量控制在300 mm內(nèi),保證了巷道在掘進期間的穩(wěn)定性。
[Abstract]:During the 1306 track trench excavation of Dongtan Coal Mine, the solid coal side was deformed and destroyed, and extruded and bulged seriously. In this paper, discrete element numerical simulation is used to analyze the change of the basic top fracture position and the evolution law of surrounding rock stress and displacement during driving along the goaf of fully mechanized caving roadway in deep well. The mechanism of large deformation and failure of solid coal side is revealed: driving roadway along goaf induces the rotational settlement of key blocks in large structure of surrounding rock, which leads to the transfer of basic top fault line to solid coal side. The change of roof structure leads to a significant increase in the supporting pressure of the solid coal side and a large area of high stress compression zone, which makes the solid coal side exhibit the characteristics of large deformation and strong rheological failure. Based on the analysis of deformation and failure mechanism of solid coal side, the control technology of solid coal side is put forward in this paper. The numerical simulation and field test show that the large horizontal deformation is effectively controlled when the breaking force is 600 kN, and the 蠁 22 mm 脳 6800 mm long anchor cable with a compression point of 260 ~ 300 kN is used to strengthen the support, and the deformation of the solid coal side is controlled within 300 mm. The stability of roadway during excavation is guaranteed.
【作者單位】： 中國礦業(yè)大學(xué)深部巖土力學(xué)與地下工程國家重點實驗室;中國礦業(yè)大學(xué)力學(xué)與土木工程學(xué)院;山東科技大學(xué)礦業(yè)與安全工程學(xué)院;
【基金】：江蘇省杰出青年基金項目(No.BK20150005) 國家自然科學(xué)基金項目(No.41272344,No.51674251,No.51374199)~~
【分類號】：TD353

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