唐山新华联广场岩溶塌陷综合探测及治理措施

发布时间：2018-06-23 14:47

  本文选题：岩溶 + 岩溶塌陷　； 参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：岩溶问题是一个世界性课题,各国在城市开发和工程建设中涉及该问题较多。我国地大物博,疆土辽阔,岩溶地貌的分布范围也就很广,分布的面积相对比较大,面积约90-140万km2。位于唐山市区,城市的中心分布有岩溶,其覆盖层厚度自30.0-70.0米不等。唐山地区的岩土工程勘察、岩溶勘察、基础设计、地基处理、建筑施工等工作,由于地下存在破碎的下伏基岩,地区复杂的地质条件、地下复杂的岩溶发育空间等疑难的地质问题,使施工难度大大增加。在地质条件如此复杂的地区进行工程建设其难度可想而知,其增加的不仅仅是施工难度,施工工期及其建设成本,此外还要面对各种不可预知的风险,此外还有可能遇到溶洞塌陷,地面岩溶塌陷等等一系列问题,因此岩溶地区的工程地质勘察的重要性就不言而喻了。因为每一个细节的失误都可能造成灾难性的后果和不可挽回的损失,所以对岩溶工程勘察、岩溶地基稳定性研究、岩溶地质灾害综合治理的分析研究是很有必要的。本文以唐山市新华联广场项目为研究对象,通过对该场区进行工程勘察,发现该场区存在岩溶塌陷地质灾害情况,然后针对场区地质情况,选择利用岩溶勘察、地震反射波、被动源面波勘探、电磁波CT等多种试验方法,分析评价场区岩溶塌陷的地基稳定性,并且提出了适合本场区岩溶地质灾害的治理方案,治理之后检测合格。主要研究成果如下:(1)通过对岩溶地质及项目周边环境进行的实地调查,掌握了唐山地区的区域地质信息,获得了大量的岩溶塌陷参数数据和地质基础资料,为后期的课题研究提供可靠的分析依据。(2)本文依托唐山新华联广场工程,场区地下存在岩溶塌陷现象,运用地震反射波法、被动源面波勘探方法、电磁波CT法初步确定了唐山新华联广场地下岩溶塌陷大概位置,认为该地基不稳定。(3)基于物探成果、稳定性分析对场区岩溶塌陷不稳定区域,采取了注浆的方式,进行了处理。(4)采取方法钻孔抽芯、地震映像等方法对注浆进行检测。可见岩溶、裂隙位置已被注入的浆液充满,芯样比较密实,无空洞等现象,钻进过程中无漏浆,掉钻、卡钻等现象,井中电视显示孔壁完整,裂隙、溶洞均已被水泥浆充填表明岩溶经过处理以后,充盈度高,结实率强。达到本次注浆效果,场区稳定。
[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.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753.8
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本文编号：2057479