Abstract : the paper presented a kind of drilling hole method that adopted direct circulation and percussion drilling , casing and cliff - protection by mud . the method applied in the complex gravel layer which has the trend to emerge cave - in and drop from the drilling wall 文摘:介绍一种在砂卵石地层层厚复杂、孔壁易掉块、易坍塌的钻孔的成孔方法? ?正循环回转与冲击钻进、套管与泥浆护壁成孔。
When the first streak of day began to show we tied up to a towhead in a big bend on the illinois side , and hacked off cottonwood branches with the hatchet , and covered up the raft with them so she looked like there had been a cave - in in the bank there 天蒙蒙亮了，我们就在靠伊利诺斯州这边一个大湾的旁边，找了个沙洲靠了岸，用斧子砍了一些杨树枝，把木筏子遮了起来。这样，这里看上去仿佛河岸在这里坍了一块似的。
Article 42 whereas land is damaged due to digging , cave - in and occupation , the units or individuals occupying the land should be responsible for reclamation according to the relevant provisions of the state ; for lack of ability of reclamation or for failure to meet the required reclamation , land reclamation fees shall be paid , for use in land reclamation 第四十二条因挖损、塌陷、压占等造成土地破坏，用地单位和个人应当按照国家有关规定负责复垦；没有条件复垦或者复垦不符合要求的，应当缴纳土地复垦费，专项用于土地复垦。
Article 26 : in mining operations or the construction of underground projects , when water drainage results in lowering of the groundwater table , groundwater depletion , ground subsidence or cave - ins , and causes losses to the livelihood and production of other units or individuals , the mining unit or the construction unit shall take remedial measures and compensate for the losses 第二十六条开采矿藏或者兴建地下工程，因疏干排水导致地下水水位下降、枯竭或者地面塌陷，对其他单位或者个人的生活和生产造成损失的，采矿单位或者建设单位应当采取补救措施，赔偿损失。
The dross - treatment factory building of baosteel is designed abroad , the idea and method in design is different from those of our country . because of the bad service conditions , a serious accident of cave - in collapse of local roof has happened , and an urgent repair has been carried out in a short time . these make the problems on the structural safety to be evident 宝钢渣处理厂房由国外设计，设计思想和方法与国内的存在一定的差别，而且由于使用条件恶劣，曾发生屋盖局部坍塌的严重事故，抢修时时间又过于紧张，使得渣处理厂房目前的安全问题突出。
