矿体回采爆破对覆压铁路安全性的数值模拟研究  

Numerical Simulation Study on Safety of Overlying Railway caused by Orebody Mining Blasting

作　　者：褚夫蛟 段玉德 李公成 王作鹏 魏志鹏 张连新 CHU Fu-jiao;DUAN Yu-de;LI Gong-cheng;WANG Zuo-ping;WEI Zhi-peng;ZHANG Lian-xin(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255000,China;Shandong Dongping Hongda Mining Co.,Ltd.,Taian 271000,China;Shandong Shengxin Mining Co.,Ltd.,Taian 271000,China)

机构地区：[1]山东理工大学资源与环境工程学院,淄博255000 [2]山东东平宏达矿业有限公司,泰安271000 [3]山东盛鑫矿业有限公司,泰安271000

出　　处：《爆破》2022年第2期179-185,共7页Blasting

基　　金：国家自然科学基金(51904177)。

摘　　要：针对某矿山Ⅰ-1矿体矿房爆破时爆破振动对铁路安全的影响,通过数值计算的方法建立矿体和铁路路基的数值模型进行安全评估,判断既有铁路路基及车站是否安全。根据矿房1、2的位置关系,在临近的铁路路基上设置1-1、2-2、3-3剖面来监测铁路路基的动态响应情况,通过计算分析路基的振动速度以及各监测剖面的应力、应变。经分析可知,铁路路基的最大振动为矿房1爆破时产生的,最大振动点位于1-1剖面的铁路路基下部,最大合速度为3.412 cm/s,三向最大速度为3.392 cm/s,为Y方向。而车站产生的振动最大值为矿房2爆破导致的,车站合振速的最大值为0.02005 cm/s,为铁路路基底部振速。矿房爆破导致的铁路路基以及车站的振动速度均小于爆破安全允许振速。矿房1爆破时,1-1剖面出现应力最大值,最大主应力最大值为8108.17 Pa,最小主应力最大值为12409.1 Pa,最大剪应力值为5955.34 Pa,所有应力值均不会导致路基出现破坏现象。而矿房2爆破时,路基的2-2剖面产生的应力值最大,但最大应力值均小于矿房1爆破时1-1剖面路基所产生的应力值。路基和车站在矿房爆破作用下产生的最大剪应变值为2.58×10^(-4)ε,由于车站距离较远,因而产生的应变值非常小,在此情况下,路基和车站不会产生明显的变形。In view of the influence of blasting vibration on railway safety in the mine room blasting ofⅠ-1 orebody,a numerical model of the orebody and railway subgrade was established to evaluate the safety of existing railway subgrade and station.According to the location relationship of the mine room 1 and 2,the sections of 1-1,2-2 and 3-3 were set on the adjacent railway subgrade to monitor the dynamic response.Specifically,the vibration speed,the stress and the strain of each monitoring profile were calculated and analyzed.Analysis shows that the maximum vibration of the railway subgrade is caused by the blasting of mining room 1,the maximum vibration point is located under the railway subgrade of section 1-1,the maximum resultant velocity is 3.412 cm/s and the maximum three-direction velocity is on the Y direction which is 3.392 cm/s.More importantly,the maximum vibration of the station is caused by the blasting of the mining room 2,and the maximum resultant vibration velocity of the station is 0.02005 cm/s,which is the bottom vibration velocity of the railway subgrade.Meanwhile,the vibration velocity of the railway subgrade and station caused by mine room blasting is less than the allowable vibration velocity of blasting safety.During the blasting of mine room 1,the maximum stress occurs on section 1-1.More precisely,the maximum principal stress is 8108.17 Pa,the maximum value of the minimum principal stress is 12409.1 Pa,the maximum shear stress is 5955.34 Pa.However,all stress values do not cause damage to the subgrade.For another,during the blasting of mine room 2,the stress value of section 2-2 of subgrade is the largest.But the maximum stress values are all less than the stress values generated by the 1-1 section subgrade during the blasting of Mine room 1.Besides,the maximum shear strain value generated by the subgrade and station under the mine room blasting is 2.58×10^(-4)ε.It is very small,because the station is far away.In this case,the subgrade and station will not produce obvious deformation.

关 键 词：矿山爆破 爆破振动 铁路路基 数值模拟 安全分析 

分 类 号：TD235[矿业工程—矿井建设] U24[交通运输工程—道路与铁道工程]