岩石力学与工程学报
巖石力學與工程學報
암석역학여공정학보
CHINESE JOURNAL OF ROCK MECHANICS AND ENGINEERING
2014年
9期
1852-1862
,共11页
赵延林%张盛国%万文%王卫军%蔡璐%彭青阳
趙延林%張盛國%萬文%王衛軍%蔡璐%彭青暘
조연림%장성국%만문%왕위군%채로%팽청양
岩石力学%溶洞突水%防水岩柱%流固耦合%强度折减法
巖石力學%溶洞突水%防水巖柱%流固耦閤%彊度摺減法
암석역학%용동돌수%방수암주%류고우합%강도절감법
rock mechanics%karst cave water inrush%water blocking rock pillar%solid-fluid coupling%shear strength reduction method
引入承压溶洞突水的管道流折算渗透系数,构建耦合非线性渗流-管道流于一体的承压溶洞突水全过程分析模型,在此基础上建立巷道前伏溶洞突水过程的流固耦合-强度折减法联动分析方法,研究承压溶洞突水全过程的流态转换机制。以七一煤矿石坝井承压溶洞突水事故为例,探讨防水岩柱的力学失稳机制和突水演化过程。研究表明:防水岩柱失稳前岩溶水非线性渗流,随着岩柱折减系数的增加,工作面渗水量增大,防水岩柱失稳后,溶洞水体突出,涌入巷道形成管道流。采用管道流模拟得到突水量在较短时间内达到峰值,由于溶洞水体储量供给约束,突水量逐渐减少,由突水初期的粗糙紊流最终变为管道层流。引入防水岩柱安全系数的概念,研究防水岩柱安全系数与溶洞内压、岩柱厚度的关系,将安全系数为1.5的岩柱厚度作为防水岩柱的计算安全厚度,提出防水岩柱工程留设厚度等于炮眼深度、爆破扰动深度和防水岩柱计算安全厚度之和的设计方法。将岩体流-固耦合理论、流态转换理论和强度折减法结合起来研究承压溶洞突水的非线性力学响应,为研究承压溶洞突水全过程提供了一种新的研究方法。
引入承壓溶洞突水的管道流摺算滲透繫數,構建耦閤非線性滲流-管道流于一體的承壓溶洞突水全過程分析模型,在此基礎上建立巷道前伏溶洞突水過程的流固耦閤-彊度摺減法聯動分析方法,研究承壓溶洞突水全過程的流態轉換機製。以七一煤礦石壩井承壓溶洞突水事故為例,探討防水巖柱的力學失穩機製和突水縯化過程。研究錶明:防水巖柱失穩前巖溶水非線性滲流,隨著巖柱摺減繫數的增加,工作麵滲水量增大,防水巖柱失穩後,溶洞水體突齣,湧入巷道形成管道流。採用管道流模擬得到突水量在較短時間內達到峰值,由于溶洞水體儲量供給約束,突水量逐漸減少,由突水初期的粗糙紊流最終變為管道層流。引入防水巖柱安全繫數的概唸,研究防水巖柱安全繫數與溶洞內壓、巖柱厚度的關繫,將安全繫數為1.5的巖柱厚度作為防水巖柱的計算安全厚度,提齣防水巖柱工程留設厚度等于砲眼深度、爆破擾動深度和防水巖柱計算安全厚度之和的設計方法。將巖體流-固耦閤理論、流態轉換理論和彊度摺減法結閤起來研究承壓溶洞突水的非線性力學響應,為研究承壓溶洞突水全過程提供瞭一種新的研究方法。
인입승압용동돌수적관도류절산삼투계수,구건우합비선성삼류-관도류우일체적승압용동돌수전과정분석모형,재차기출상건립항도전복용동돌수과정적류고우합-강도절감법련동분석방법,연구승압용동돌수전과정적류태전환궤제。이칠일매광석패정승압용동돌수사고위례,탐토방수암주적역학실은궤제화돌수연화과정。연구표명:방수암주실은전암용수비선성삼류,수착암주절감계수적증가,공작면삼수량증대,방수암주실은후,용동수체돌출,용입항도형성관도류。채용관도류모의득도돌수량재교단시간내체도봉치,유우용동수체저량공급약속,돌수량축점감소,유돌수초기적조조문류최종변위관도층류。인입방수암주안전계수적개념,연구방수암주안전계수여용동내압、암주후도적관계,장안전계수위1.5적암주후도작위방수암주적계산안전후도,제출방수암주공정류설후도등우포안심도、폭파우동심도화방수암주계산안전후도지화적설계방법。장암체류-고우합이론、류태전환이론화강도절감법결합기래연구승압용동돌수적비선성역학향응,위연구승압용동돌수전과정제공료일충신적연구방법。
With the introduction of the equivalent hydraulic conductivity of pipe flow for the water inrush of confined karst cave,a nonlinear model of coupled seepage-pipe flows was established to simulate the entire process of water inrush. The model was combined with the strength reduction method and solid mechanics to study the change of flow state of water inrush of confined karst cave. The instability of water blocking rock pillar and the water inrush occurred at Qiyi mine in south China were discussed. The water discharge from the working front increased with the increasing of the reduction factor of the strength of the water block rock pillar before the rock pillar losing its stability. After the failure of the rock pillar,water burst out from the confined karst cave to form pipe flow. The amount of the water irrupted reached the peak value in a short time then decreased slowly according to the simulation. The turbulent flow at the initial stage was changed into the laminar pipe flow finally due to the limited water reserve of the karst cave. The safety factor of water blocking rock pillar was introduced and the relations of the safety factor,the water pressure in the karst cave and the thickness of the water blocking rock pillar were studied. The thickness of the water blocking rock pillar with the safety factor of 1.5 was proposed to be the calculated safety thickness. The safety thickness of the water blocking rock pillar was proposed to be equal to the sum of the depth of blasting hole,the depth of blasting disturbance and the calculated safety thickness.