大尺度混凝土巷旁墙体开裂机理及控制对策
发布时间：2019-06-14 22:42
【摘要】：为防止深井沿空留巷大尺度混凝土巷旁墙体开裂破坏,通过水化热测定试验分析了充填材料的水化放热特性,在此基础上利用ANSYS软件模拟了巷旁墙体温度场的演化规律,理论计算了温度应力的变化特征,探讨了巷旁墙体在温度应力及采动应力双重作用下的破坏过程与机理.结果表明:充填前期巷旁墙体的内外温差高达22.0℃,由此引起的温度应力超过巷旁墙体的抗拉强度,致使巷旁墙体出现温度裂缝;顶板压力使温度裂缝扩展,最终导致巷旁墙体开裂破坏.基于巷旁墙体双因素致裂机理,从降低墙体内外温差及缓解顶板压力2个方面提出墙体开裂控制对策,并将其应用于1231(1)沿空留巷工程实践,取得了良好的留巷效果.
[Abstract]:In order to prevent the cracking and failure of the wall next to the large scale concrete roadway along the goaf, the hydration and exothermic characteristics of the filling material are analyzed by hydration heat measurement test. On this basis, the evolution law of the temperature field of the wall next to the roadway is simulated by ANSYS software, the variation characteristics of the temperature stress are calculated theoretically, and the failure process and mechanism of the wall next to the roadway under the dual action of temperature stress and mining stress are discussed. The results show that the internal and external temperature difference of the wall next to the roadway is as high as 22.0 鈩，
本文编号：2499754
[Abstract]:In order to prevent the cracking and failure of the wall next to the large scale concrete roadway along the goaf, the hydration and exothermic characteristics of the filling material are analyzed by hydration heat measurement test. On this basis, the evolution law of the temperature field of the wall next to the roadway is simulated by ANSYS software, the variation characteristics of the temperature stress are calculated theoretically, and the failure process and mechanism of the wall next to the roadway under the dual action of temperature stress and mining stress are discussed. The results show that the internal and external temperature difference of the wall next to the roadway is as high as 22.0 鈩，
本文编号：2499754
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