本文選題：大同盆地 + GPS速度場(chǎng)　； 參考：《長(zhǎng)安大學(xué)》2015年碩士論文

【摘要】：大同盆地是汾渭盆地內(nèi)地殼構(gòu)造活動(dòng)劇烈,地質(zhì)災(zāi)害多發(fā)的地區(qū),尤其近年來(lái)大同市發(fā)育的地裂縫成為了最為典型和嚴(yán)重的災(zāi)害,給當(dāng)?shù)亟ㄖ陌踩珟?lái)了威脅。為了進(jìn)一步了解大同盆地的地殼形變運(yùn)動(dòng)特性以及與地質(zhì)災(zāi)害的關(guān)系,本文基于GPS獲取的大同盆地實(shí)測(cè)速度場(chǎng)資料,進(jìn)行了以下的學(xué)習(xí)研究:采用多面函數(shù)法建立了該區(qū)域的水平和垂直速度場(chǎng)模型,并根據(jù)已建立的水平運(yùn)動(dòng)模型,通過(guò)對(duì)該模型求偏導(dǎo)數(shù)的方式求解了大同盆地的應(yīng)變參數(shù),得到了區(qū)域的應(yīng)變場(chǎng)。從得到的應(yīng)變面膨脹圖和剪切應(yīng)變圖中看出大同盆地應(yīng)變顯著區(qū)域位于大同市區(qū),并且大同市的地裂縫都經(jīng)過(guò)了這些應(yīng)變的高值區(qū)域。因此在這些拉張與剪切力的作用下,同時(shí)結(jié)合超采地下水等其它導(dǎo)致地面沉降的因素,最終發(fā)展出了地裂縫災(zāi)害。接著通過(guò)實(shí)測(cè)和擬合得到的速度場(chǎng)資料,使用Def Node負(fù)位錯(cuò)反演程序,初步計(jì)算得到了大同盆地口泉斷裂中段的閉鎖程度,反演得到的結(jié)果表明口泉斷裂中段的閉鎖程度整體上約為0.4,閉鎖程度不大,斷層的蠕滑要多于粘滑,整體上處于蠕滑狀態(tài)。因此作為一條活動(dòng)斷裂,應(yīng)考慮由于其錯(cuò)動(dòng)所造成的對(duì)建筑物的緩慢破壞作用并對(duì)其加以防范。
[Abstract]:Datong basin is an area with intense crustal structure activity and frequent geological hazards in Fenwei basin. In recent years, the ground fissures developed in Datong City have become the most typical and serious disaster, which threaten the safety of local buildings. In order to further understand the characteristics of crustal deformation and movement in Datong Basin and its relationship with geological disasters, this paper is based on the measured velocity field data of Datong Basin obtained by GPS. The following studies are carried out: the horizontal and vertical velocity field models of the region are established by using the multi-plane function method, and the strain parameters of the Datong basin are solved by calculating the partial derivative of the model according to the established horizontal motion model. The strain field of the region is obtained. From the strain plane expansion diagram and shear strain diagram, it can be seen that the significant strain area of Datong basin is located in Datong urban area, and the ground fractures in Datong City have passed through the high value region of these strains. Therefore, under the action of these tensioning and shearing forces, combined with other factors that lead to ground subsidence, such as over-exploited groundwater, the ground fissure disaster was finally developed. Then, by using the Def Node negative dislocation inversion program, the locking degree of the middle section of the Kou Quan fault in Datong Basin is preliminarily calculated by using the velocity field data obtained from the measured and fitted data. The inversion results show that the degree of locking in the middle section of the Kou Quan fault is about 0.4 on the whole, and the degree of locking is not large, the creep of the fault is more than that of the viscous slip, and the whole is in the state of creeping. Therefore, as an active fracture, the slow damage to buildings caused by its dislocation should be considered and prevented.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P227

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