本文選題：巖溶 + 巖溶塌陷��； 參考：《中國地質(zhì)大學(北京)》2017年碩士論文

【摘要】：巖溶問題是一個世界性課題,各國在城市開發(fā)和工程建設(shè)中涉及該問題較多。我國地大物博,疆土遼闊,巖溶地貌的分布范圍也就很廣,分布的面積相對比較大,面積約90-140萬km2。位于唐山市區(qū),城市的中心分布有巖溶,其覆蓋層厚度自30.0-70.0米不等。唐山地區(qū)的巖土工程勘察、巖溶勘察、基礎(chǔ)設(shè)計、地基處理、建筑施工等工作,由于地下存在破碎的下伏基巖,地區(qū)復雜的地質(zhì)條件、地下復雜的巖溶發(fā)育空間等疑難的地質(zhì)問題,使施工難度大大增加。在地質(zhì)條件如此復雜的地區(qū)進行工程建設(shè)其難度可想而知,其增加的不僅僅是施工難度,施工工期及其建設(shè)成本,此外還要面對各種不可預知的風險,此外還有可能遇到溶洞塌陷,地面巖溶塌陷等等一系列問題,因此巖溶地區(qū)的工程地質(zhì)勘察的重要性就不言而喻了。因為每一個細節(jié)的失誤都可能造成災(zāi)難性的后果和不可挽回的損失,所以對巖溶工程勘察、巖溶地基穩(wěn)定性研究、巖溶地質(zhì)災(zāi)害綜合治理的分析研究是很有必要的。本文以唐山市新華聯(lián)廣場項目為研究對象,通過對該場區(qū)進行工程勘察,發(fā)現(xiàn)該場區(qū)存在巖溶塌陷地質(zhì)災(zāi)害情況,然后針對場區(qū)地質(zhì)情況,選擇利用巖溶勘察、地震反射波、被動源面波勘探、電磁波CT等多種試驗方法,分析評價場區(qū)巖溶塌陷的地基穩(wěn)定性,并且提出了適合本場區(qū)巖溶地質(zhì)災(zāi)害的治理方案,治理之后檢測合格。主要研究成果如下:(1)通過對巖溶地質(zhì)及項目周邊環(huán)境進行的實地調(diào)查,掌握了唐山地區(qū)的區(qū)域地質(zhì)信息,獲得了大量的巖溶塌陷參數(shù)數(shù)據(jù)和地質(zhì)基礎(chǔ)資料,為后期的課題研究提供可靠的分析依據(jù)。(2)本文依托唐山新華聯(lián)廣場工程,場區(qū)地下存在巖溶塌陷現(xiàn)象,運用地震反射波法、被動源面波勘探方法、電磁波CT法初步確定了唐山新華聯(lián)廣場地下巖溶塌陷大概位置,認為該地基不穩(wěn)定。(3)基于物探成果、穩(wěn)定性分析對場區(qū)巖溶塌陷不穩(wěn)定區(qū)域,采取了注漿的方式,進行了處理。(4)采取方法鉆孔抽芯、地震映像等方法對注漿進行檢測�？梢妿r溶、裂隙位置已被注入的漿液充滿,芯樣比較密實,無空洞等現(xiàn)象,鉆進過程中無漏漿,掉鉆、卡鉆等現(xiàn)象,井中電視顯示孔壁完整,裂隙、溶洞均已被水泥漿充填表明巖溶經(jīng)過處理以后,充盈度高,結(jié)實率強。達到本次注漿效果,場區(qū)穩(wěn)定。
[Abstract]:Karst problem is a worldwide problem, which is often involved in urban development and engineering construction. Because of its vast territory and vast territory, China has a wide distribution of karst landforms, with a relatively large area of 90-1.4 million km2. Located in Tangshan district, karst is distributed in the center of the city. The thickness of overburden varies from 30.0m to 70.0 m. The geotechnical engineering survey, karst exploration, foundation design, foundation treatment, construction and other work in Tangshan area, due to the existence of broken rock, complex geological conditions in the area, The complicated underground karst development space and other difficult geological problems greatly increase the difficulty of construction. It can be imagined that it is difficult to carry out engineering construction in areas with such complicated geological conditions. It increases not only the difficulty of construction, the construction period and its construction cost, but also faces all kinds of unpredictable risks. In addition, there may be a series of problems such as cave collapse, surface karst collapse and so on, so the importance of engineering geological survey in karst area is self-evident. Because every detail error may cause disastrous consequences and irreparable losses, it is necessary to study karst engineering investigation, karst foundation stability research and comprehensive management of karst geological hazards. This paper takes the Xinhualian Square Project of Tangshan City as the research object, through the engineering survey of the site area, finds out that there are karst collapse geological disasters in the field area, and then chooses to utilize karst survey and seismic reflection wave in view of the geological situation in the field area. Passive source surface wave exploration, electromagnetic wave CT and other test methods are used to analyze and evaluate the stability of karst collapse foundation in the field area, and a treatment scheme suitable for karst geological hazard in this field area is put forward, which is qualified after treatment. The main research results are as follows: (1) through the field investigation of karst geology and the surrounding environment of the project, the regional geological information of Tangshan area has been grasped, and a large amount of karst collapse parameter data and geological basic data have been obtained. It provides a reliable analysis basis for the later research. (2) based on the Tangshan New Hualian Square Project, there is karst collapse in the underground of the field area. The seismic reflection wave method and the passive source surface wave exploration method are used in this paper. The electromagnetic wave CT method has preliminarily determined the general location of underground karst collapse in Xinhualian Square, Tangshan, and considered that the foundation is unstable. (3) based on the geophysical exploration results, the stability analysis of the unstable karst collapse area in the field area is carried out by grouting method. (4) the method of drilling and core-pulling and seismic mapping are used to detect the grouting. It can be seen that the karst, fissure position has been filled with injected slurry, the core sample is relatively dense, there are no cavities and other phenomena, there is no slurry leakage, no drilling, and so on during drilling, and the hole wall is intact and fissure is shown on television in the well. The caverns have been filled with cement slurry to show that the karst after treatment has high filling degree and strong setting rate. The grouting effect is achieved and the field area is stable.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU753.8
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本文編號：2057479