【Production Version】Daily Question 20180102
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Which of the following statements regarding the construction sequence of the double-side wall adit method is correct? ( ) A. First, excavate one side of the pilot tunnel and promptly complete its initial support. B. Simultaneously, excavate the other side of the pilot tunnel and construct its initial support. C. Then, excavate the upper core soil and build the initial support for the arch section. D. Next, excavate the lower level and construct the initial support at the bottom, so as to complete the initial support for the entire cross-section. E. Finally, remove the initial support from the exposed sections of the pilot tunnel and install the inner lining. Correct answers: ACDE
The following statements regarding the construction sequence of the double-side wall adit method are correct (ACDE). A. First, excavate one side of the pilot tunnel and promptly close its initial support.
B. Simultaneously, excavate the other side of the pilot tunnel and construct its initial support.
C. Then, excavate the upper core soil and build the initial support for the arch section.
D. Next, excavate the lower level and construct the initial support at the bottom, so as to close the initial support across the entire cross-section.
E. Finally, remove the initial support in the exposed areas of the pilot tunnel and install the inner lining
B. Simultaneously, excavate the other side of the pilot tunnel and construct its initial support.
C. Then, excavate the upper core soil and build the initial support for the arch section.
D. Next, excavate the lower level and construct the initial support at the bottom, so as to close the initial support across the entire cross-section.
E. Finally, remove the initial support in the exposed areas of the pilot tunnel and install the inner lining