【摘要】：為了預(yù)測不同端部條件及不同煤層傾角下巷旁支護(hù)體的變形和破壞規(guī)律,利用FLAC3D構(gòu)建巷旁支護(hù)體模型,通過試算法,獲得模型內(nèi)聚力和內(nèi)摩擦角隨塑性剪切應(yīng)變的折減函數(shù)關(guān)系,使數(shù)值模型與充填材料在物理壓縮試驗(yàn)中獲得的應(yīng)力-應(yīng)變關(guān)系和破壞規(guī)律一致�；谠摲N賦值條件,對巷旁支護(hù)體在不同端部條件下的變形破壞規(guī)律進(jìn)行研究,獲得以下結(jié)論:無端部約束下,峰前支護(hù)體內(nèi)的應(yīng)力分布近似均勻,可自由側(cè)向變形,且傾角對支護(hù)體進(jìn)入塑性時(shí)的峰值載荷大小沒有明顯影響;存在端部效應(yīng)時(shí),支護(hù)體的峰值承載能力有所提高,并將在側(cè)向產(chǎn)生非均勻變形。在端部約束條件下,隨著傾角的變化,支護(hù)體的破壞形式不同:當(dāng)傾角為0°~10°時(shí),呈現(xiàn)多重剪切破壞;10°~25°時(shí),呈現(xiàn)雙裂隙的剪切破壞;25°時(shí),邊界單元呈現(xiàn)摩擦剪切破壞。此外,在傾角作用下,存在端部約束時(shí),在支護(hù)體的銳角處應(yīng)力集中程度最高,在進(jìn)行支護(hù)設(shè)計(jì)時(shí)應(yīng)補(bǔ)強(qiáng)支護(hù)。
[Abstract]:In order to predict the deformation and failure law of the side support of roadway with different end conditions and different inclined angles of coal seam, the model of side support of roadway was constructed by FLAC3D, and the trial algorithm was used. The reduction function of cohesive force and internal friction angle with plastic shear strain is obtained, and the stress-strain relationship and failure law obtained by the numerical model are consistent with those obtained in the physical compression test of the filling material. Based on this assignment condition, the deformation and failure law of roadway side support body under different end conditions is studied. The following conclusions are obtained: the stress distribution in front of peak support is approximately uniform and free lateral deformation can be obtained under no end restraint. And the angle of inclination has no obvious influence on the peak load when the support body enters the plasticity. In the presence of end effect, the peak bearing capacity of the supporting body is increased, and the lateral deformation will be uneven. Under the constraint condition of the end, with the change of the inclination angle, the failure forms of the support body are different: when the inclination angle is 0 擄~ 10 擄, it presents multiple shear failure; when the slope angle is 0 擄~ 10 擄, it presents the shear failure of double fractures; at 25 擄, the boundary element presents friction shear failure. In addition, under the action of inclination angle, the stress concentration at the sharp angle of the support body is the highest when the end constraint exists, and the support should be strengthened when the support design is carried out.
【作者單位】： 重慶大學(xué)煤礦災(zāi)害動(dòng)力學(xué)與控制國家重點(diǎn)實(shí)驗(yàn)室資源及環(huán)境科學(xué)學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51474039,51404046) 重慶大學(xué)煤礦災(zāi)害動(dòng)力學(xué)與控制國家重點(diǎn)實(shí)驗(yàn)室自主課題項(xiàng)目(2011DA105287 ZD201302) 重慶市研究生科研創(chuàng)新項(xiàng)目(CYS15007)
【分類號】：TD353

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