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(五)插入深度为防止地下连续墙在基坑开挖时发生倾覆或翘起,防止基坑底面隆起或发生管涌,地下连续墙必须插入基坑底面以下足够深度。1.为防止墙体倾覆或翘起对于无支撑(无锚)地下连续墙,按布鲁姆理论计算的最小插入深度为(图94):
(5) The depth of penetration shall be such that the underground diaphragm wall will not be overturned or tilted during the excavation of the foundation pit and the bottom of the foundation pit shall be prevented from bulging or piping. The underground diaphragm wall must be inserted to a sufficient depth below the bottom surface of the foundation pit. 1. To prevent the wall from overturning or tilting For an unsupported (anchorless) diaphragm wall, the minimum insertion depth calculated according to Broom’s theory is (figure 94):