如何确保勘察质量（How to ensure the quality of investigation）How to ensure the quality of exploration under the current competitive market conditions - debate with expert Guo ShutaiManagement reminder: this post is executed by 2008-04-03Strict management to ensure the quality of investigationComprehensive survey and Design Institute of Ministry of construction Guo ShutaiIn 2001, this paper won the first prize of the first regulation committee of Beijing, and there are still some points for reference todayI. PrefaceThe promulgation of Regulations construction engineering quality management is a major event in Chinas construction industry, the Regulations not only for the parties to engage in construction activities to further clarify the responsibilities and obligations of quality supervision and inspection, at the same time, also stressed the implementation of strengthening the quality of the construction of laws and regulations and mandatory standards. In recent years, the quality accidents of large and malignant construction projects occur frequently, and the implementation of the regulations is extremely urgent. By studying the quality, responsibility and obligation of the survey and design units in the third chapter of the regulations, and combining with the engineering practice, the quality control suggestions for the following projects are put forward.1. strictly investigate the quality of process control.1.1 collect and analyze the data of the survey work is sufficient or not, will directly affect whether can develop a reasonable economic and feasible plan for exploration. In the event of adverse geological phenomena, it is necessary to give full attention to the formulation of the survey plan, without fighting the unprepared battle.1.2 write the investigation outline of investigation outline is a guiding document for investigation of the process, should be clear, specific, operable, before writing the investigation outline, should be made by the owner or fill in the technical requirements of investigation and design units, in order to deeply understand the design intent, and some of them have put. Without the preparation of the survey outline or without the signature of the auditor, the phenomenon of exploration will often arise and should be paid full attention to.1.3 field survey and test the original field recording is the investigation process work first-hand information, some units did not attach enough importance, such as stratigraphic description roundness and natural gradation, these industry stratification often brings great difficulties.Pairs of a and B buildings should be measured site shear wave speed, and some projects to do the quantity is not enough, even do not do, very seriously.Breakage of soil sampler and standard penetration device is still in use, resulting in serious distortion of data. Due to the large layered difficult footage.When the light penetration test is used in individual projects, the standard study is not enough and the understanding is not deep, and the maximum experimental depth sometimes exceeds the specifications.Drilling hole elevation measurement without closure, I do not know how accurate?. The location or number of the reference points is not indicated or ominous. Record is not standard, no signature, no date.The stratigraphic division is not reasonable, such as the yellow brown, gray and brown two colors of different soil division a layer is obviously unreasonable, according to the different causes of age and depositional environment division.1.4 indoor geotechnical test personnel and technical personnel responsible for the lack of communication, test personnel do experiments, the abnormal situation do not inform technical personnel check; technical personnel do not speak the experimental results and check the original records, the experimental results are not compared, brought on by, leaving hidden dangers for engineering quality.Test personnel should be familiar with the code for investigation of geotechnical engineering, such as the case of 0 15m depth in the silt fine sand at,Clay content analysis should be carried out in order to evaluate the liquefaction potential even if the technical person does not require it.1.5, collation of the industry information, the abnormal situation should be analyzed and determined. Such as the upper miscellaneous fill and find fresh red brick, wood deep in the old-fashioned layer, it should analyze whether the hole collapse and falling block caused by the abnormal layer found most probably it did not actually happen. The draw for the miscellaneous fill soil is obviously a. When necessary, should go to the site to drill proof, until thoroughly identified, without leaving any hidden dangers. Be careful and careful. In order to avoid differences in soil physical and mechanical indicators of the larger layer, missing the soft interlayer, suggested i