【摘要】：疊瓦狀逆斷層是地殼中分布的主要斷層組合形式之一。為了揭示地質(zhì)演化過(guò)程中不同組合形式下疊瓦狀逆斷層間地應(yīng)力分布規(guī)律,采用大型物理模擬手段,以龍門山地區(qū)的地質(zhì)構(gòu)造為背景,研究了兩條平行疊瓦狀逆斷層和在其間與之相交的斷層組合形式下地應(yīng)力分布和變化規(guī)律。取得的主要認(rèn)識(shí)如下:(1)對(duì)于研究區(qū)僅分布兩條平行的疊瓦狀逆斷層,構(gòu)造擠壓方向與它們的走向垂直的情況,靠近構(gòu)造擠壓端的斷層會(huì)首先發(fā)生失穩(wěn)破壞,較大的局部應(yīng)力釋放會(huì)使地殼內(nèi)部整體應(yīng)力有所降低,但在下伏斷層的深部會(huì)出現(xiàn)應(yīng)力的突然升高;(2)對(duì)于研究區(qū)不僅分布兩條平行的疊瓦狀逆斷層,而且在兩條斷裂之間存在一條與它們垂直的逆斷層,構(gòu)造擠壓方向與疊瓦狀逆斷層垂直,疊瓦狀逆斷層附近淺層地應(yīng)力變化較早,地殼易沿疊瓦狀逆斷層首先失穩(wěn)活動(dòng),進(jìn)而帶動(dòng)所夾逆斷層的地應(yīng)力發(fā)生調(diào)整;(3)對(duì)于研究區(qū)不僅分布兩條平行的疊瓦狀逆斷層,在其間夾著走向與它們垂直的逆斷層,構(gòu)造擠壓方向與疊瓦狀逆斷層斜交情況,地殼易沿所夾斷層首先失穩(wěn)活動(dòng),進(jìn)而觸發(fā)疊瓦狀逆斷層地應(yīng)力變化;(4)僅存在疊瓦狀逆斷層,地應(yīng)力分布較為均勻;疊瓦狀逆斷層間夾逆斷層的情況下,在斷層端部和幾條斷層交匯部位出現(xiàn)了應(yīng)力集中現(xiàn)象。該問題的研究對(duì)區(qū)域穩(wěn)定性評(píng)價(jià)和地震預(yù)測(cè)具有一定的指導(dǎo)意義。
[Abstract]:Imbricate thrust fault is one of the main fault assemblages distributed in the crust. In order to reveal the distribution of in-situ stress between imbricate thrust faults in different combination forms during geological evolution, a large-scale physical simulation method is adopted, and the geological structure in Longmen Mountain area is taken as the background. The distribution and variation of in-situ stress of two parallel imbricate thrust faults and their intersecting fault assemblages are studied. The main results are as follows: (1) for only two parallel imbricate thrust faults distributed in the study area, if the direction of tectonic compression is perpendicular to their strike, the failure of faults near the compressive end of the structure will occur first. The larger local stress release will decrease the overall stress in the crust, but it will suddenly increase in the deep part of the underlying fault. (2) not only two parallel imbricate reverse faults are distributed in the study area, Moreover, there is a thrust fault perpendicular to them between the two faults, the direction of tectonic compression is perpendicular to the imbricate thrust fault, the shallow ground stress changes earlier near the imbricate thrust fault, and the crust is prone to be unstable first along the imbricate thrust fault. Then the in-situ stress of the thrust fault is adjusted. (3) for the study area, not only two parallel imbricate thrust faults are distributed, but also the thrust faults with strike perpendicular to them, the tectonic compression direction and the imbricate thrust fault are oblique. The earth's crust is easily unstable along the fault, and then triggers the change of in-situ stress of the imbricate thrust fault. (4) there is only the imbricate thrust fault, and the distribution of the in-situ stress is more uniform. In the case of interlocking thrust fault between the imbricate thrust faults, Stress concentration occurs at the end of the fault and at the intersection of several faults. The study of this problem has certain guiding significance for regional stability evaluation and earthquake prediction.
【作者單位】： 長(zhǎng)安大學(xué)地質(zhì)工程與測(cè)繪學(xué)院;國(guó)土資源部巖土工程開放研究實(shí)驗(yàn)室;西北有色勘測(cè)工程公司;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(310826151048) 國(guó)家自然科學(xué)基金(41030749,41072223) 中國(guó)地質(zhì)調(diào)查局項(xiàng)目(1212010914205)資助
【分類號(hào)】：P315

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