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为了确定侧压系数对巷道变形与周边应力分布规律的影响,使用岩体力学、FLAC3D有限差分数值模拟软件对1<λ<3与λ>3下圆形巷道顶板下沉量、底鼓量、左帮位移和右帮位移以及周边应力分布的影响进行了研究.结果表明,当1<λ<3时巷道周边应力为压应力,当λ>3时巷道周边应力既有压应力又有拉应力,且2种情况下周边应力分布基本上都以巷道中心呈对称分布;随着λ的增大巷道的右帮位移、左帮位移、底鼓量都增大,两帮位移比较接近,顶板下沉量随着λ的增大而减小.通过工程实例得到较大侧压下仅考虑顶压作用的传统支护设计不能有效地控制巷道帮部变形及底鼓,可选用能抵抗侧压的支架与加强帮部支护方式来控制巷道变形.
In order to determine the influence of lateral pressure coefficient on the deformation of roadway and the distribution of surrounding stress, rock mass mechanics and FLAC3D finite difference numerical simulation software were used to simulate the settlement of roof, the amount of bottom drum, Left displacement and right displacement as well as the distribution of the surrounding stress are studied.The results show that when 1 <λ <3, the surrounding stress of the roadway is compressive stress, and when λ> 3, the surrounding stress of the roadway has both compressive stress and tensile stress , And the surrounding stress distribution is basically symmetrical in the center of the roadway in both cases. With the increase of λ, the right-hand displacement of the roadway, the displacement of the left and the amount of the bottom drum all increase, and the displacements of the two groups are relatively close. Under the roof The volume of the tunnel decreases with the increase of λ.According to the engineering example, the traditional support design considering only the top pressure can not effectively control the deformation and bottom drum of tunnel gangway, Bracket and strengthen the gang support to control the roadway deformation.