The Applied Research In CM Composite Foundation Of Tunnel Engineering

With the robust developments of composite foundation, CM composite foundation, an innovative composite foundation, has been approved by geotechnical engineering industry. However, the application of CM composite foundation in tunnel projects has not been fully studied, so the gist of this dissertation is to analyze its application. Although, at present, there is a certain understanding of mechanism of action on composite foundation among CM engineers, its application analysis is still missing, for many of which are basically relied on engineers experiences. Based on the current study of CM composite foundation in tunnel project, the author assumes that it is of paramount importance to deeper analyze, as well as its reality significance.Exemplify by the combination of Qianhai Shenzhen-Hong Kong cooperation zone, Shuangjiehe Rd, Tinghai Rd and underground tunnel project, this dissertation will analyze the topic from the following aspects:First and foremost, from the perspective of theoretical analysis, mechanical action, stress ratio and bearing ratio, this dissertation analyzes the working efficiency of CM composite foundation, and draw a conclusion that the control of stress ratio and bearing ratio among piles can effectively improve the bearing capacity. Working efficiency can be improved by the CM soil bearing capacity of composite foundation cushion thicknesses. With the increasing thickness of foundation cushion, the difference between shear stress decreased, so does the pile load balancing, but the balance between piles horizontal load increased.Secondly, For the situ test of CM composite of foundation tunnel project, the author carry out the experiment of combining two C piles and two M piles,to illustrate the strength of foundation after the application of CM three-dimensional from the received data.Thirdly, the author designs the proposal of site load test, grouping 3 piles C, 3 piles M to the experiment of single pile static load test this dissertation presented the live load test of this project, and analyzed the C pile load tests, M pile load test and the results and rules of plate loading test of CM composite foundation. Monitored by the pressure gauge which is embedded in the site and compared to the design requirements for testing the efficiency of CM Composite Foundation in tunnel engineering. Data shows that the foundation bearing capacity can not only meet the design requirements but also remain certain carrying space.Last but not least, taken the advantage of MIDAS-GTS finite element software engineering for analysis of composite foundation CM actual tunnel project static test numerical simulation, test results are similar to actual test results, which prove the feasibility and accuracy of finite element software MIDAS-GTS in analog composite foundation. Moreover, it confirms the true effectiveness of test data. By modeling, the author analyze the tunnel project CM composite foundation stress ratio and distribution ratio respectively, and its results show that CM Composite Foundation exert significant effect on ground deformation and stress concentration. Keywords: tunnel engineering; CM composite foundation; ground handling;...