Calculation method for ground surface settlement outside foundation pit due to dewatering of incomplete well in the foundation pit of phreatic stratum
A technology for surface subsidence and complete wells, applied in calculations, special data processing applications, instruments, etc., can solve the problems of not considering the special influence of precipitation curves and large errors, and achieve the effects of small errors, effective guidance, and accurate calculation results
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Embodiment 1
[0058] Such as image 3 As shown, this embodiment provides a method for calculating the precipitation curve outside the foundation pit caused by the precipitation in the foundation pit and calculating the surface settlement, including the following steps:
[0059] The present invention provides a method for calculating surface settlement outside the foundation pit caused by dewatering of an incomplete well in a foundation pit of a submerged stratum, comprising the following steps:
[0060] S1. Carry out the model test design of the precipitation in the foundation pit, and obtain the precipitation curve outside the foundation pit caused by the precipitation in the foundation pit of the submerged stratum; thus, the water level drop at any position outside the foundation pit caused by the precipitation in the foundation pit can be obtained, and a simplified calculation model of surface settlement can be established Such as figure 1 .
[0061] S2, the precipitation curve is fitt...
Embodiment 2
[0098] The movement of groundwater caused by precipitation will generate a new seepage field and break the initial static equilibrium state, so that both the seepage field and the stress field of the soil around the well will change, and the additional stress caused by the seepage force is the dehydration and consolidation of the upper layer. The most important cause of compaction, ignoring other secondary factors, the direction of the additional stress is approximately the same as the direction of seepage force. In the seepage area, there are horizontal components and vertical components in the seepage force due to the seepage action, so the direction of the seepage force is tangent to the stable water table at any point and points to the foundation pit. After the precipitation infiltration curve is formed, it is divided into a dry part and a saturated part above and below the curve. Throughout the precipitation history, s 1 The soil in the area is drained, s 2 The soil in ...
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