【摘要】：采用土工離心機(jī)試驗(yàn),研究正斷層和逆斷層錯(cuò)動(dòng)引起上覆飽和黏土層在20步連續(xù)斷層錯(cuò)動(dòng)作用下的變形特性以及裂縫擴(kuò)展的規(guī)律。研究結(jié)果顯示,正斷層錯(cuò)動(dòng)后地表呈現(xiàn)多條且平行斷層面的張拉裂縫,隨著錯(cuò)動(dòng)量的增大,正斷層破裂逐漸偏離基巖斷層的錯(cuò)動(dòng)方向,偏向上盤一側(cè),裂縫逐漸向上盤的方向開裂,裂縫主要發(fā)生在斷層延長(zhǎng)線附近;逆斷層錯(cuò)動(dòng)后地表裂縫均分布在上盤,而且離斷層尖端延長(zhǎng)線較遠(yuǎn),產(chǎn)生的裂縫較細(xì)、數(shù)量較少,隨著斷層錯(cuò)動(dòng)量的增大,地表位移增大,靠近斷層下盤一側(cè)的地表受斷層錯(cuò)動(dòng)影響較小,位于斷層上盤一側(cè)的地表則隨著斷層錯(cuò)動(dòng)顯著移動(dòng);隨著斷層錯(cuò)動(dòng)量的增大,最大地表坡度隨之增大,正斷層引起的最大坡度的位置逐漸向上盤方向移動(dòng),逆斷層引起的最大坡度的位置逐漸向下盤方向移動(dòng),逆斷層的影響范圍比正斷層的影響范圍更廣。
[Abstract]:By means of geotechnical centrifuge test, the deformation characteristics of the overlying saturated clay layer caused by the dislocation of normal fault and reverse fault and the law of crack propagation under the misoperation of 20-step continuous fault are studied. The results show that there are many tensile fractures on the surface of normal fault after fault dislocation and parallel fault plane. With the increase of fault momentum, normal fault rupture gradually deviates from the direction of dislocation of bedrock fault and deviates to one side of the upper side. The cracks gradually crack in the direction of the upper face, the cracks mainly occur near the extension line of the fault, the surface cracks are distributed in the upper face after the reverse fault is staggered, and they are far away from the extension line at the tip of the fault, resulting in a smaller number of cracks. With the increase of fault momentum, the surface displacement increases, the surface near the bottom of the fault is less affected by fault dislocation, the surface located on the upper side of the fault moves significantly with fault dislocation, and with the increase of fault momentum, The position of the maximum slope caused by normal fault gradually moves to the upper disk, and the position of the maximum slope caused by reverse fault moves down gradually. The influence range of reverse fault is wider than that of normal fault.
【作者單位】： 東京大學(xué)土木工程系;中國(guó)科學(xué)院成都山地災(zāi)害與環(huán)境研究所山地災(zāi)害與地表過(guò)程重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(No.41301009)~~
【分類號(hào)】：TU41

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