Deformation Responses and Mechanical Mechanism of Existing Tunnel due to New Building Construction

Table 5

Model test process.

Step	Name of the condition
1	Read the initial value
2	Dewater
3	Excavate to −133 mm depth
4	Tension the first layer of anchor cable
5	Excavate to −266 mm depth
6	Excavate to −400 mm depth
7	Tension the second layer of anchor cable
8	Excavate to −533 mm depth
9	Excavate to −666 mm depth
10	Tension the third layer of anchor cable
11	Excavate to −800 mm depth
12	Excavate to −933 mm depth
13	Excavate to −1000 mm depth
14	Stay stationary after excavation completion
15	Load the mat foundation
16	Load the first layer of weights
17	Load the second layer of weights
18	Load the third layer of weights
19	Load the fourth layer of weights
20	Load the fifth layer of weights
21	Load the sixth layer of weights
22	Load the seventh layer of weights
23	Stay stationary after load completion
24	Groundwater recover to the initial level
25	Stay stationary after groundwater recover