Applicability Analysis Of Gauss Formula In Hefei Area And Study On The Ground Subsidence Of Shield Construction Near The Deep Foundation

With the continuous development of urbanization in China, leading to more and more city traffic pressure. In order to alleviate traffic pressure, reduce traffic pollution, taking resource conservation development way, China has set off a boom of rail transit construction. The construction of rail transit will produce ground movement, resulting in land subsidence. At the present, a lot of research has done for the land subsidence. In this paper, combined with the Hefei rail transit 1,2 line monitoring data, two aspects of research work have been carried out.In shield tunnel construction, it will inevitably lead to ground movement from the angle of technical principle, which will lead to different degrees of subsidence, The Gauss equation is the most famous subsidence prediction method. But the formula is a kind of empirical equation based on finite data. Before using the Gauss equation, the formula need to be verified by the experimental data, and gets the calculation parameters for the region. In this paper, the formula is verified by the surface monitoring data of the Hefei Rail Transit Line 1 and 2. At the same time, the Trough Width Parameter and Volume Loss are calculated. It provides the basis for the application of Gauss equation in the process of shield construction in Hefei.In urban rail transit construction, it is difficult to avoid the formation of ground movement, resulting in ground subsidence. In the actual monitoring, the subsidence of some sections is a little big. This often leads to large deformation of underground pipelines, so as to produce a huge secondary disaster such as water seepage, collapse and interruption of line. In the research process of this phenomenon, it is found that the subsidence of abnormal section is often near deep foundation. In the existing formula for predicting the ground subsidence, no one has considered the condition of the shield near the deep foundation. The most commonly used Gauss formula does not accurately predict the subsidence value of the case. This paper analyzed the causes of this phenomenon and proposed the calculation method of ground subsidence for shield construction under the condition of near deep foundation. The method is more accurate for predicting the subsidence of the ground.In this paper, combined with the Hefei rail transit construction monitoring data, It is proved that the Peck formula is applicable in Hefei area. The parameters which are suitable for the subsidence prediction of Metro Construction in Hefei area are given., analyzed the condition of near existing deep foundation conditions may lead to excessive subsidence of the ground and gives a calculation method of ground subsidence. it has a certain reference value for the prevention and control of collapse of rail transit ground subsidence in Heife.