【摘要】：為研究巖溶隧道富裂隙圍巖爆炸過程中應(yīng)力波的傳播與衰減規(guī)律,運(yùn)用ANSYS/LS-DYNA軟件對隧道巖體中含不同充填介質(zhì)、不同寬度和不同爆源距離的巖溶裂隙進(jìn)行了數(shù)值模擬。結(jié)果表明:爆炸應(yīng)力波在巖溶裂隙處的傳播主要受裂隙內(nèi)充填介質(zhì)的物理力學(xué)性質(zhì)的影響,其次受到裂隙寬度、爆源與裂隙距離和爆源強(qiáng)度等因素的影響。充填介質(zhì)的強(qiáng)度越小,波阻抗也越小,對介質(zhì)中應(yīng)力波的阻隔作用則越大。裂隙與爆源的距離越遠(yuǎn),爆源強(qiáng)度越小,有效應(yīng)力峰值也越小。裂隙越寬,對應(yīng)力波的削弱越大。結(jié)合該結(jié)論對巖溶隧道裂隙圍巖在爆破過程中出現(xiàn)的實(shí)際問題進(jìn)行分析,找出了影響爆破效果的關(guān)鍵因素,通過調(diào)整爆破設(shè)計(jì)參數(shù),得到了不同裂隙圍巖條件下爆破參數(shù)參考值,經(jīng)現(xiàn)場測試取得了較好的爆破效果,研究結(jié)果可為類似條件下的隧道爆破參數(shù)的優(yōu)化提供理論依據(jù)和參考。
[Abstract]:In order to study the law of stress wave propagation and attenuation in the explosion process of fractured rock mass in karst tunnel, the numerical simulation of karst fracture with different filling medium, different width and different explosion source distance in tunnel rock mass was carried out by using ANSYS/LS-DYNA software. The results show that the propagation of explosive stress wave in karst fracture is mainly affected by the physical and mechanical properties of the filling medium in the fracture, and then by the crack width, the distance between the source and the crack, the strength of the explosion source, and so on. The smaller the strength of the filling medium, the smaller the wave impedance, and the greater the barrier to the stress wave in the medium. The farther the distance between fracture and explosion source is, the smaller the strength of detonation source is and the smaller the peak value of effective stress is. The wider the crack, the greater the weakening of the corresponding force wave. Combined with this conclusion, the practical problems in blasting process of fractured surrounding rock in karst tunnel are analyzed, the key factors affecting blasting effect are found out, and the blasting design parameters are adjusted. The reference values of blasting parameters are obtained under the conditions of different fissure surrounding rocks, and good blasting results are obtained by field test. The results can provide theoretical basis and reference for the optimization of blasting parameters of tunnels under similar conditions.
【作者單位】： 長沙理工大學(xué)土木與建筑學(xué)院;長沙理工大學(xué)橋梁工程湖南省高校重點(diǎn)實(shí)驗(yàn)室;新余學(xué)院建筑工程學(xué)院;
【基金】：國家自然科學(xué)基金(51278071,51308072) 長沙理工大學(xué)橋梁工程湖南省高校重點(diǎn)實(shí)驗(yàn)室開放基金資助項(xiàng)目(15KA03)
【分類號】：U455.6;U451.2

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