岩土力学Issue(5)：1357-1366,1376,11.
围岩弹塑性变形条件下锚杆、喷混凝土和U型钢的支护效果研究
Support effects of anchor bolt, shotcrete and U-steel in elastoplastic stage of surrounding rock
摘要
Abstract
Analytical solutions to the complete action process of surrounding rock-support in elastoplastic stage have been provided. Supporting structures of anchor bolt, shotcrete and U-steel are commonly used in the practical projects. It is a critical theoretical issue to further study the three supporting structures on this basis. Based on the spatial effects of the excavation face, and according to the analytical solutions above-mentioned, the supporting structures respectively through project examples in which the surrounding rocks have diameters of 6 m, 5 m, 4 m, is studied. And the thesis mainly includes three the following parts:calculations of ultimate bearing capacity of the above three structures, calculation and analysis about the effect on controlling plastic deformation of surrounding rock based on the spatial effects of the excavation face, and analysis of the supporting effect on the Protodyakonov's surrounding rock pressure by the remaining supporting force. It is also studied U-steel constitutive relationship between load and displacement, proposes conception of the remaining force and analyses the mechanism of supporting structure restricting deformation of surrounding rock. Two conclusions are drawn as follows. (1) Compared with the in-situ stress(>10 MPa), the supporting forces (<1 MPa) provided by the three supporting structures are too low to control the elastoplastic deformation of the surrounding rock with diameters of 6 m, 5 m or more larger, but the supporting forces are effective for the surrounding rock with diameters of 4 m . (2)For the the surrounding rock with diameters of 6 m and 5 m or more larger, if the remaining supporting force can be reserved effectively, supporting structure can support Protodyakonov's pressure availably.关键词
开挖面效应/弹塑性变形/围岩-支护作用机制/支护效果/剩余承载力Key words
spatial effects of the excavation face/elastoplastic deformation/mechanism of coupled action of surrounding rock-support/supporting effect/remaining supporting force分类
建筑与水利引用本文复制引用
侯公羽,李晶晶,杨悦,王亚潇,李庆伟,梁永辉..围岩弹塑性变形条件下锚杆、喷混凝土和U型钢的支护效果研究[J].岩土力学,2014,(5):1357-1366,1376,11.基金项目
国家自然科学基金委员会与神华集团有限责任公司联合资助重点项目（No. U1261212，U1361210）。 （）
