Determining method of hydrogeololgy parameters under the action of waterproof curtains
A water-stop curtain and hydrogeological technology, applied in excavation, construction, infrastructure engineering, etc., can solve problems such as complex calculation, hydrogeological parameters of difficult aquifers, and long time consumption, and achieve simple methods, easy promotion, and great application value Effect
Inactive Publication Date: 2016-02-03
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
The numerical method can be used to determine the horizontal and vertical permeability coefficients of the aquifer, but the establishment of a numerical model for calculation is complicated and time-consuming. For field engineers, it is difficult to directly use the numerical method to determine the hydrogeological parameters of the aquifer.
Therefore, the existing technical literature cannot provide a method that can directly determine the hydrogeological parameters of the aquifer when pumping water in the foundation pit under the action of the water-stop curtain
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[0052] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0053] Such as Figure 1-Figure 3 As shown, this embodiment provides a method for determining hydrogeological parameters under the action of a water-stop curtain, which is used in a Shanghai rail transit wind shaft project. The design size of the foundation pit is a rectangle with a side length of 49m×22.5m. The depth is 28.15m, and the underground diaphragm wall is used as the enclosure structure; the method includes the following steps:
[0054] The first step is to obtain the soil layer divisi...
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The invention provides a determining method of hydrogeololgy parameters under the action of waterproof curtains. On the basis of obtaining soil layer information and hydrogeology information, the method determines the pump capacity of a pumping well during a test so as to record the dropdown and the corresponding time of an observation well during the test by using a semilogarithm coordinate system. According to the recorded drawdown time curve characteristic, different time periods are divided, and the data of the later stage of the second time period and the data of the third time period are respectively matched; the second time period intercept and third time period slope are recorded, so that the hydrogeology parameters of an aquifer are determined. The method disclosed by the invention provides a basis for the design of the dewatering of a pit, so that an effective guarantee is provided for the safety of projects and environmental protection. The method disclosed by the invention is simple and practical, facilitates promotion and has a high application value.
Description
technical field [0001] The invention relates to a method in the technical field of construction engineering, in particular to a method for determining hydrogeological parameters under the action of a water-stop curtain. Background technique [0002] With the rapid development of my country's economy and unprecedented urbanization requirements, the rational development and application of underground space is extremely important. In recent years, a large number of deep foundation pit projects have emerged continuously. At the same time, groundwater has a great impact on the safety of foundation pits, especially pressurized water, which is one of the important factors for the safe construction of foundation pits. The jacking effect of the piezometric water head in the confined aquifer may cause sudden surges on the bottom of the pit, and it is necessary to reduce the water level of the confined water to ensure the safety of the foundation pit. At present, the combination of wa...
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IPC IPC(8): E02D19/18E02D17/02E02D19/10
Inventor 武永霞沈水龙陈柯霖吴怀娜
Owner SHANGHAI JIAO TONG UNIV