【摘要】：U型鋼可縮性支架是由U型鋼棚各段相互搭接而成的,而U型鋼搭接段之間的相互作用是通過卡纜來完成的,因此卡纜是U型鋼支架的關(guān)鍵部位,它既決定了支架的可縮性能,又對支架工作阻力的確定起到關(guān)鍵性作用,其性能直接影響著U型鋼支架的支護承載性能。但在煤礦實際使用過程中,卡纜易被破壞而失效。本文現(xiàn)場使用卡纜的破壞特征為研究對象,首先以現(xiàn)場收集的卡纜失效破壞的特征為研究背景,分析不同類型卡纜破壞的力學(xué)特征;建立直墻半圓拱U型鋼支架承載的力學(xué)簡化模型,分析U型鋼支架承受載荷時內(nèi)力的分布,得出U型鋼支架搭接段是U型鋼支架內(nèi)力集中處和卡纜是承載搭接段內(nèi)力的關(guān)鍵部件。其次利用ABAQUS數(shù)值模擬軟件,對螺桿卡纜、雙槽夾板卡纜和雙槽夾板面卡纜分別建模,分析了卡纜滑移前后卡纜構(gòu)件應(yīng)力分布特征,確定了卡纜失效破壞的原因和薄弱環(huán)節(jié)。最后通過直墻半圓拱U型鋼支架分析了卡纜預(yù)緊力對支架內(nèi)力的影響和預(yù)緊力對支架承載能力的影響,通過數(shù)值模擬的結(jié)果分析了同類型卡纜在施加不同預(yù)緊力情況下U型鋼搭接段阻力,不同類型卡纜在相同預(yù)緊力作用下U型鋼搭接段阻力,并結(jié)合不同卡纜在不同預(yù)緊力下各自的承載特征及其優(yōu)缺點分析出雙槽夾板面卡纜的優(yōu)越性。通過鄭煤集團裴溝煤礦42091工作面運輸巷的現(xiàn)場應(yīng)用,取得了良好的效果。
[Abstract]:The U-shaped steel shearing bracket is formed by the overlap of each segment of the U-shaped steel shed, and the interaction between the U-section steel lap segments is accomplished by the cable, so the cable is the key part of the U-shaped steel support, which determines the retractability of the support. It also plays a key role in determining the working resistance of the support, and its performance directly affects the bearing capacity of the support of U-shaped steel support. However, in the actual use of the coal mine, the cable is liable to be destroyed and invalidated. In this paper, the damage characteristics of cable clamping are studied. Firstly, the mechanical characteristics of different types of cable are analyzed based on the characteristics of cable failure collected in the field. The mechanical simplified model of bearing capacity of U-shaped steel support with straight wall semi-circular arch is established, and the distribution of internal force of U-shaped steel support under load is analyzed. It is concluded that the lap section of U-shaped steel support is the key component of the internal force of the U-steel support and the cable is the key component to carry the internal force of the lap section. Secondly, the ABAQUS numerical simulation software is used to model the screw cable, the double-slot splint cable and the double-slot plywood cable respectively. The stress distribution characteristics of the cable members before and after the cable slip are analyzed, and the failure reasons and the weak links of the cable clamp are determined. Finally, the influence of cable pretension force on the support internal force and the influence of pretension force on the bearing capacity of the support are analyzed by means of the U-shaped steel support with semicircular arch of the straight wall. Based on the numerical simulation results, the resistance of the same type of cable under different pretightening forces is analyzed, and the resistance of different types of cable in the same type of cable under the same pretension force is analyzed. The advantages and disadvantages of double slot plywood clamping cable are analyzed according to the bearing characteristics and advantages and disadvantages of different cables under different preloading forces. Through the field application of 42091 face transportation roadway in Peigou Coal Mine of Zheng Coal Group, good results have been obtained.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD353.2;TG142.1

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