When drill bar reaches down to the presumptive rock surface, it will be lifted up at certain speed to make grout be mixed with weathered sand forcedly;when grout consolidates, a wall has been formed.

• 当钻杆到达预定岩面后，以一定速度向上提升钻杆，使浆液与土体强制混合，待浆液凝固后便形成防渗墙。