Abstract
As a new type of waterproof curtain, several station construction of Qingdao Metro Line 1 successfully used the trench cutting remixing deep wall (TRD). It is difficult to find the factors that affect the wall quality because the method is in situ underground excavating and mixing. This paper has obtained the main factors affecting the TRD quality in Qingdao by studying construction experience and carrying out tests. Geological conditions are fundamental factors. Among them, the parameters of medium-coarse sand layer, the groundwater table, and the humus content are the main factors. The design parameters are the key to high-quality TRD. In the design parameters, the depth inserting into the bedrock, the cement soil ratio, and the mixing time are important factors. And this paper proposes the methods of improving the wall quality, which can provide a theoretical guarantee for the follow-up application of the TRD in the Qingdao area.
Highlights
The length of the line of Qingdao Metro Line 1 (Figure 1) is about 60 km, and a total of 39 stations are underground stations
In response to the influencing factors, this paper proposes countermeasures of improving the trench cutting remixing deep wall (TRD) quality
The design parameters (Table 2) used in the TRD method are based on Excavation Engineering Manual [21], Specification for Construction of Diaphragm Wall [22], Technical Specification for Soil Mixed Wall [23], Technical Specification for Trench Cutting Remixing Deep Wall [24], and other regulations [25,26,27] and are determined with the geological conditions in Qingdao
Summary
The length of the line of Qingdao Metro Line 1 (Figure 1) is about 60 km, and a total of 39 stations are underground stations. The specific operation (Figure 3) is as follows: first, insert the chain cutter into the foundation and dig to the design depth of the wall; secondly, inject the cement slurry and mix with the in situ soil, continue to horizontally excavate, mix, and advance to build a high-quality TRD [6]. The above researches have studied various types of cement soil mixing method but not the influencing factors of TRD. This paper has obtained the main factors affecting the TRD quality by studying experience and carrying out tests in Qingdao, which prevent the quality problem in the future application. In response to the influencing factors, this paper proposes countermeasures of improving the TRD quality It can provide a direction for the future application of the TRD in the Qingdao area
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