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侧向爆炸荷载下直墙拱形岩洞强度的近似分析 总被引:1,自引:0,他引:1
本文根据文献的分析,将岩洞围岩简化为厚壁受弯构件,通过动力分析,给出自由场压力与岩洞强度直接联系的近似计算公式。文中算例表明,用这一计算方法近似判断岩洞强度在工程范围内是适用与方便的。文末给出一个典型工程算例。 相似文献
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In this paper according to the results of a great quantity of tests and numerical calculations, it is pointed out that the
surrounding rock with thickness of 1/3 span has mechanical characteristics of a thick flexural member in underground rock
cave subjected to transverse blast loading. However, it approaches the stress state of free field outside country rock and
the equation of thick plate theory under the loading of free field pressure may be applied to the solution of this problem.
Therefore, the underground structure-country rock dynamic interaction may be described by dynamic equations of flexural members
of thin plate and thick plate, which express linear and country rock respectively. The interaction force between the liner
and country rock is expressed as contacting pressure function q(x, l). By solving system of simultaneous equations, the analytical
solution for the dynamic analysis of arch-straight liner including elastic half space interaction effect is given and the
analytical expression of function q(x, t) is obtained.
This analytic solution will contribute to the study of some substantive problems of underground structure-medium dynamic interaction
theoretically.
(Instutute of Engineering Mechanics, Academia Sinica) 相似文献
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曹志远;杨昇田;郭琳 《力学与实践》1980,2(4):38-41
本文讨论了承受高速动载荷厚板结构的力学量分布规律、厚壁因素效应、厚跨比影响范围、结构的动力反应以及厚薄界限,剪弯界限等一系列力学形态,重点指出其和一般薄板分析的差别.研究结果对于其它厚壁结构如深梁、厚框、厚拱、厚壳等,也可作类似分析.厚板结构的力学形态(一)位移、应力沿厚度方向分布规律1.垂直挠度 w 沿厚度分布基本上仍保持常 ... 相似文献
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本文根据大量试验和数值分析结果指出:在侧向爆荷下岩洞在厚度为跨度三分之一围岩中具有厚壁受弯构件的力学特征,而在该围岩区外即基本上接近自由场应力状态,并可用厚板理论方程在自由场压力的外载下进行求解.因此,地下结构与围岩动力相互作用,可用分别代表衬砌及介质的基于薄板与厚板理论的受弯构件动力方程宋描述.围岩和衬砌二者之间的相互作用力用接触压力函数q(x,t)加以联系.通过解一组联立方程,给出了计入与弹性半空间相互作用效应的直墙拱顶衬砌时动力分析的解析解,同时列出了函数q(x,t)的解析表达式. 本解析解将有助于从理论上探讨地下结构与介质动力共同作用的一些本质问题. 相似文献
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在采矿中崩落和诱导崩落的经典计算方法是采用应力集中和梁板理论。本文所建议的非经典理论计算方法改善了目前的计算结果。一、前言在采矿中,破坏岩石和防止岩石破坏,都同 ... 相似文献
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通过近似机动铰线,根据加速度极值原理给出任一边界矩形板在均匀冲击荷载作用下考虑转动惯量时的刚塑性分析,建立在中等载荷时确定极限荷载及破坏机构形状参数方程。一、加速度极值原瑶对于每一时刻在所有运动可能的,σ_(ij),中,真正的使下列泛函达到最 ... 相似文献
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In this paper according to the results of a great quantityof tests and numerical calculations,it is pointed out that thesurrounding rock with thickness of1/3 span has mechanicalcharacteristics of a thick flexural member in underground rockcave subjected to transverse blast loading.However,it ap-proaches the stress state of free field outside country rockand the equation of thick plate theory under the loading offree field pressure may be applied to the solution of this prob-lem.Therefore,the underground structure-country rock dynamicinteraction may be described by dynamic equations of flexuralmembers of thin plate and thick plate,which express linear andcountry rock respectively.The interaction force between theliner and country rock is expressed as contacting pressure func-tion q(x.t).By solving system of simultaneous equations,theanalytical solution for the dynamic analysis of arch-straightlinerincluding elastic half space interaction effect is givenand the analytical expression of function q(x,t)is o 相似文献