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Salinized soil field thaw collapsing index detection method

A detection method, saline soil technology, applied in the field of foundation soil survey, construction, basic structure engineering, etc., can solve the problem that the description or calculation method of drilling to determine the infiltration depth cannot be given, and the requirements of engineering survey progress cannot be met. The field test is difficult to determine and grasp the problems, so as to achieve the effect of convenient understanding and operation, solving heavy workload and meeting the needs of the project

Active Publication Date: 2014-05-28
西安中交一公院瑞通科研试验检测有限公司
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Problems solved by technology

[0003] The main defect of the standard method is that a group of tests can only obtain the dissolution coefficient of the saline soil layer under one pressure, which requires a large amount of work and often cannot meet the requirements of the engineering survey progress
The existing problem is: currently there is no relevant specification or literature to give the exact definition of soft saline soil, and it is difficult to determine and grasp it in field tests
The existing problems are: the specification does not give the description or calculation method for drilling to determine the infiltration depth; the Rayleigh wave velocity measurement method determines the water immersion depth of the foundation based on the abrupt point on the change curve of the measured wave velocity depth. For foundations with little change in moisture content, there will be no sudden changes in the wave velocity curve, and the infiltration depth of the foundation cannot be determined

Method used

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specific Embodiment

[0059] The test site is located in Chaerhan Salt Lake, Qinghai Province. Parallel experiments were carried out using the conventional single-line method and the new method. The test results are shown in Table 1, Table 2 and Table 3. The comparison results show that: in the case of the same maximum loading, the new method can obtain multiple sets of test results (dissolution amount and dissolution coefficient) at one time, which can greatly reduce the test workload and meet the needs of the project progress.

[0060] Table 1 Data table of single-line method dissolution test (maximum loading 200kPa)

[0061]

[0062] Table 2 The new method dissolution test data table (maximum loading 200kPa)

[0063]

[0064] Table 3 Comparison of test results of dissolution coefficient

[0065]

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Abstract

The invention relates to a salinized soil field thaw collapsing index detection method. According to an immersion load test for measuring thaw collapsing coefficients in Salinized Soil Area Building Code (SY / T0317-2012), only the thaw collapsing coefficients of a salinized soil layer under one standard atmospheric pressure can be obtained through a set of tests and needed workloads are large. According to the salinized soil field thaw collapsing index detection method, two load tests can be carried out at the same time on the same test field. According to one load test, under the natural state condition, loads are added grade by grade until the pressure P of the last grade is achieved, and a foundation settles and is stabilized when the load of each grade is added and then the load of the next grade is added. According to the other load test, the foundation is fully immersed and saturated, loads are added grade by grade until the foundation settles and is stabilized. The settlement difference of the foundation in the immersion state and the foundation in the natural state under the same pressure grade is the thaw collapsing amount of the pressure grade. The thaw collapsing coefficient delta m is calculated through the formula in the specifications. According to the salinized soil field thaw collapsing index detection method, the thaw collapsing amounts and the thaw collapsing coefficients under multiple grades of pressure can be obtained through one-time testing, the determined salinized soil thaw collapsing amount and the thaw collapsing coefficient basically conform to a regular single line method and the efficiency of the tests can be greatly improved.

Description

technical field [0001] The invention relates to a detection method of a dissolution index, in particular to a detection method of a saline soil site dissolution index. Background technique [0002] At present, the on-site subsidence test method for saline soil sites mainly refers to the "Water Immersion Load Test for Determining the Subsidence Coefficient" in the "Building Code for Saline Soil Areas" (SY / T0317-2012). The specific steps of the method proposed in this specification are: loading in stages under the condition of natural moisture content, and after loading until the foundation settlement of the last stage is stable, keep the pressure constant and inject water into the test pit, and the foundation is fully saturated with water until the settlement is stable. The difference in foundation settlement before and after water immersion is the amount of subsidence under this pressure. [0003] The main defect of the standard method is that a group of tests can only obt...

Claims

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Application Information

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IPC IPC(8): E02D1/00
Inventor 刘军勇张留俊曹松傑程小强尹睿捷
Owner 西安中交一公院瑞通科研试验检测有限公司
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