公路山岭隧道超前钻探地质预报研究

发布时间：2018-01-18 00:04

本文关键词：公路山岭隧道超前钻探地质预报研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年，我国隧道建设主要向西北、西南等复杂地质地区转移，而且隧道逐渐向深埋长程方向发展，因此在隧道施工中常不可避免地遇到溶洞、软弱围岩、富水带、瓦斯地层等不良地质体，若相应施工措施不及时或不当，，轻则影响施工进度，增加施工投入，重则威胁施工人员的生命安全，然而目前我国隧道施工中主要采用的预报方法，因诸多因素，常常无法达到较为准确的预报效果，相对地，超前地质钻探预报干扰因素少，数据结果更为直观，解译更为准确，应受到更大重视。本文以十天线甘肃段小川隧道和成州隧道为工程依托，分别进行冲击钻探、取芯钻探试验，将钻探结果进行地质解译，并与相应掌子面实际地质状况进行对比分析，以得到冲击钻探各钻进参数与实际岩体地质状况的相互关联性，以及取样钻探所取岩芯样本对实际岩体反映的真实度，从而提高超前钻探地质预报的准确性。研究主要成果如下： 1.岩体的地质特征与4个钻进参数扭矩、推进压力、钻进速度、旋转速度的变化存在一定的相关联系，如泥岩与角砾岩互层、底砾岩、砾岩中含水、砾岩层理发育、节理裂隙发育等，同时，石灰岩、砾岩、泥岩相比，因地质组成、结构不同，从而形成各参数整体不同的变化特征。 2.取芯钻探预报直观、准确，但在岩体具体位置预报上存在有误差，尤其是在取芯困难的复杂地质区域内，而且与冲击钻探一样也存在预报断面小的缺点，所以在钻探完成之后，掌子面地质描述仍需继续展开，作为对预报结果的补充与完善。
[Abstract]:In recent years, the tunnel construction of our country mainly transfers to the northwest, southwest and other complex geological areas, and the tunnel gradually develops to the direction of deep buried long distance, so it is inevitable to meet the cave and weak surrounding rock in the tunnel construction. If the corresponding construction measures are not timely or improper, the construction progress will be affected, the construction investment will be increased, and the safety of the construction personnel will be threatened. However, the main forecasting methods used in tunnel construction in our country at present, because of many factors, often can not achieve a more accurate prediction results, relatively speaking, the prediction interference factors of advanced geological drilling is less, the data result is more intuitive. Interpretation is more accurate and deserves greater attention. Based on the 10-antenna Xiaochuan Tunnel and Chengzhou Tunnel in Gansu region, the paper carries out impact drilling, core-drilling test and geological interpretation of the drilling results. In order to get the correlation between the drilling parameters and the actual geological conditions of rock mass, the actual geological conditions of rock mass are compared and analyzed. And the true degree of the core samples reflected to the actual rock mass, so as to improve the accuracy of geological prediction of advanced drilling. The main results of the study are as follows: 1. The geological characteristics of rock mass are related to the torque of four drilling parameters, the propelling pressure, drilling speed and rotation velocity, such as mudstone and breccia interbed, bottom conglomerate, and water content in conglomerate. At the same time, compared with limestone, conglomerate and mudstone, because of the different geological composition and structure, the variation characteristics of the whole parameters are formed, such as the development of conglomerate bedding and the development of joints and fissures, and at the same time, compared with limestone, conglomerate and mudstone. 2. The prediction of coring drilling is intuitionistic and accurate, but there are some errors in the prediction of the specific position of rock mass, especially in the complex geological area where the coring difficulty is difficult, and it also has the shortcoming of small prediction section as well as that of impact drilling. Therefore, after drilling, the geological description of the face of the face still needs to be carried out as a complement and perfection to the forecast results.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456.3

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