盾构区间基岩面探查的综合勘察法应用

Application of comprehensive survey method in the bedrock surface investigation of shield tunnel

在软土城市轨道交通工程建设中,沿线工程地质条件对盾构区间设计方案的影响较大,局部地段的基岩分布往往直接影响到设计方案的可行性.而通过地质钻探与物探的相互比对,是准确查明复杂地质条件的有效手段.在宁波市轨道交通2号线二期招宝山站-红联站区间的岩土工程勘察中,采用浅层地震反射波法配合地质钻探进行联合勘察,将物探的"线"与地质钻探的"点"结合起来,通过相互印证和综合解释,查明了场地下伏基岩面的埋深及起伏形态,为盾构区间设计方案的稳定提供了可靠的地质依据.

In the construction of urban rail transit in soft soil area,the route’s engineering geologic conditions can seriously affect the design of shield tunnel,the distribution of bedrock in some specific sections often affects the feasibility of the design directly.However,the comparison of the data from geological exploration with the geophysical prospecting proves to be the most effective way to ascertain the complex geological conditions.The shallow seismic reflection method and the geological drilling are used jointly in the engineering survey of the shield tunnel between the Zhaobaoshan station and Honglian station of line2in Ningbo rail transit.The burieddepth and fluctuant form of the bedrock surface are obtained by the comparison and comprehensive interpretation of the geophysical survey line and geological drilling points,which provides a reliable geological basis for the design of shield tunnel.