【摘 要】
：
对冲击地压巷道围岩破坏原因和机理进行分析,建立了冲击吸能耦合支护模型(围岩-吸能材料-钢支架),分析了吸能耦合支护结构冲击能耗散机理,提出了冲击地压巷道吸能耦合支护方
论文部分内容阅读
对冲击地压巷道围岩破坏原因和机理进行分析,建立了冲击吸能耦合支护模型(围岩-吸能材料-钢支架),分析了吸能耦合支护结构冲击能耗散机理,提出了冲击地压巷道吸能耦合支护方式,并提出建立安全巷道或部分安全区供避难场所.利用有限元计算方法,对直墙半圆拱形巷道吸能耦合支护前后应力和变形进行了数值分析.计算结果表明,无支护条件下,巷道顶、底部均形成应力集中区,顶角处应力最大,极易造成巷道两肩破坏;采用吸能耦合支护后,应力发生转移和扩散,围岩应力场和位移场趋于均匀化,应力集中区向两帮扩大,同时巷道整体变形明显降低,从而提高了冲击地压巷道安全程度,为巷道围岩安全支护提供了一种新方法.
其他文献
The decomposition of methoxy on Cu(111),Ag(111),Au(111),Ni(111),Pt(111),Pd(111),and Rh(111)has been studied in detail by the density functional theory calculati
The experimental study on ozonation of ethylenethiourea (ETU) is conducted. The reaction of gas-phase ETU with 0.63×10-6 mol/L ozone is carried out in a 200-L
Dodecyl-benzophenone(DBP) and hexadecoxyl-benzophenone(HDBP) as type II photoinitiators used for radical photopolymerization systems were synthesized by Friedel
This article gives the equivalent conditions of the local asymptotics for the overshoot of a random walk with heavy-tailed increments, from which we find that t
I-doped titanium dioxide nanospheres (I-TNSs) were synthesized via a two-step hydrothermal synthesis route, their potential for the efficient utilization of vis
The Limu tin deposits located in the Nanling tin and tungsten-polymetallic ore belt are now facing resource depletion after decades of exploitation. Peripheral
The space-charge distributions of electric double-layer capacitors (EDLCs),which are energy storage devices,were examined with the pulsed electroacoustic (PEA)
A series of competitive metal-ion transport experiments has been performed.Each involved transport from an aqueous source phase across an organic membrane phase
A magnetic adsorbent can be easily recovered from treated water by magnetic force, without requiring further downstream treatment. In this research, amine-funct
A series of novel Michael addition products of fluorene to chalcone were obtained in the presence of sodium hydroxide under solvent-free condition. The advantag