本文選題：安全工程 + 側壓力系數(shù)��； 參考：《安全與環(huán)境學報》2017年02期

【摘要】：為研究側壓力系數(shù)對巷道周邊巖體穩(wěn)定性的影響,以一條深埋圓形巷道工程為背景,采用離散顆粒元軟件PFC3D分析了5種側壓力系數(shù)下巷道周邊巖體的應力差、位移、破裂分布模式和微裂紋數(shù)等,得到了圓形巷道周邊巖體應力、變形和破裂隨側壓力系數(shù)的變化規(guī)律。結果表明,1)隨側壓力系數(shù)增大,巷道頂?shù)撞繙\部巖體主應力差先增大后減小,深部巖體主應力差逐漸增大;而巷道兩幫淺部巖體主應力差變化較小,深部巖體主應力差先減小后增大。這表明在相同埋深情況下,高側壓力系數(shù)不一定會對幫部巖體造成更大的破壞,但更容易使頂板產(chǎn)生高剪應力,不利于頂板巖體的穩(wěn)定。2)側壓力系數(shù)越大,巷道頂板巖體豎向位移就越小,且其由拱頂往外平滑遞減的規(guī)律性也越不明顯,而幫部巖體水平位移變化規(guī)律與頂板巖體相反。3)巷道頂?shù)撞繃鷰r在側壓力系數(shù)較大的情況下較易發(fā)生破裂,并隨側壓力系數(shù)增大,其破裂范圍越來越大;巷道兩幫巖體則在不同側壓力系數(shù)下均會發(fā)生破裂,且其破裂范圍隨側壓力系數(shù)增大而略減小。4)不同側壓力系數(shù)下,巷道巖體總裂紋數(shù)都隨開挖時間呈指數(shù)增長;且當巷道開挖完成后,巖體總裂紋數(shù)與側壓力系數(shù)呈拋物線關系。
[Abstract]:In order to study the influence of lateral pressure coefficient on the stability of surrounding rock mass of roadway, the stress difference and displacement of surrounding rock mass under five kinds of lateral pressure coefficients are analyzed by using discrete particle element software PFC3D under the background of a deep buried circular roadway project. The stress, deformation and rupture of surrounding rock mass of circular roadway are obtained according to the fracture distribution pattern and the number of micro-cracks, and the variation law of rock mass stress, deformation and fracture with the lateral pressure coefficient is obtained. The results show that with the increase of the lateral pressure coefficient, the principal stress difference of the shallow rock mass at the top and bottom of the roadway increases first and then decreases, and the principal stress difference of the deep rock mass increases gradually, while the main stress difference of the two sides of the roadway is small. The principal stress difference of deep rock decreases first and then increases. This indicates that under the same buried depth, the high lateral pressure coefficient will not necessarily cause more damage to the rock mass, but it is more likely to cause high shear stress on the roof, which is not conducive to the stability of the roof rock mass. 2) the larger the lateral pressure coefficient, the greater the lateral pressure coefficient is. The smaller the vertical displacement of roadway roof rock is, the less obvious is the regularity of smooth decline from arch roof to outside. The horizontal displacement of the roof rock mass is contrary to that of the roof rock mass. 3) the rock mass at the top and bottom of the roadway is prone to fracture under the condition of larger lateral pressure coefficient, and with the increase of the lateral pressure coefficient, the fracture range becomes larger and larger. On the other hand, the rock mass of two sides of roadway will be ruptured under different lateral pressure coefficients, and the fracture range decreases slightly with the increase of lateral pressure coefficient .4) under different lateral pressure coefficients, the total number of cracks in roadway rock mass increases exponentially with the excavation time. When the tunnel excavation is completed, the total crack number of rock mass is parabolic with the lateral pressure coefficient.
【作者單位】： 河南理工大學土木工程學院;中國礦業(yè)大學深部巖土力學與地下工程國家重點實驗室;
【基金】：國家重點基礎研究發(fā)展計劃973項目(2014CB046905) 河南理工大學博士基金項目(B2017-51)
【分類號】：TD322

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本文編號：1970761