CAJ | 학술논문

已给出弹塑性变形条件下围岩-支护相互作用的全过程解析求解，在此基础上深入研究3种常用支护结构的支护作用效果，是非常必要的。考虑开挖面空间效应，根据弹塑性变形条件下围岩-支护相互作用的全过程解析求解，针对6、5、4m直径的工程算例，分别对素喷混凝土、锚杆和U型钢等3种支护结构的支护作用效果进行了理论计算与分析，主要包括：3种支护结构极限承载能力理论计算、基于开挖面空间效应的3种支护结构控制围岩弹塑性变形的理论计算与效果分析、剩余支护承载力对普氏围岩压力支护效果的计算与分析；研究了U型钢支架的荷载-径向变形本构关系、提出了剩余支护承载力的概念、分析了支护结构支护围岩各类形变压力的支护机制。研究结果表明：（1）3种支护结构能提供的支护承载力pi （<1 MPa）相对于原岩应力p0（>10 MPa）来说量级太低，控制5～6 m及更大直径的巷道围岩弹塑性变形是无效的，但控制4 m直径的巷道围岩弹塑性变形是有效的；（2）对于直径达5～6 m甚至更大的巷道围岩，若支护结构的剩余支护承载力pi 2能有效地被保存，则支护结构还可以起到有效地支护普氏围岩压力的作用。
이급출탄소성변형조건하위암-지호상호작용적전과정해석구해，재차기출상심입연구3충상용지호결구적지호작용효과，시비상필요적。고필개알면공간효응，근거탄소성변형조건하위암-지호상호작용적전과정해석구해，침대6、5、4m직경적공정산례，분별대소분혼응토、묘간화U형강등3충지호결구적지호작용효과진행료이론계산여분석，주요포괄：3충지호결구겁한승재능력이론계산、기우개알면공간효응적3충지호결구공제위암탄소성변형적이론계산여효과분석、잉여지호승재력대보씨위암압력지호효과적계산여분석；연구료U형강지가적하재-경향변형본구관계、제출료잉여지호승재력적개념、분석료지호결구지호위암각류형변압력적지호궤제。연구결과표명：（1）3충지호결구능제공적지호승재력pi （<1 MPa）상대우원암응력p0（>10 MPa）래설량급태저，공제5～6 m급경대직경적항도위암탄소성변형시무효적，단공제4 m직경적항도위암탄소성변형시유효적；（2）대우직경체5～6 m심지경대적항도위암，약지호결구적잉여지호승재력pi 2능유효지피보존，칙지호결구환가이기도유효지지호보씨위암압력적작용。
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.