Study On No Damaged Detection Of Cement Soil Mixing Pile Cutoff Wall

Strengthening and eliminating dangers of embankment engineering is an important work of our country water conservancy department since long ago. Take prevention of seepage measure and strengthen embankment impervious ability are very important. The vertical prevention of seepage of embankment construction is an important administration measure for the problem of steady seepage and seepage. Vertical prevention of seepage can divided into completely replace type, half replace type and nonreplace type according to the impervious device. It can also divided into the wall of concrete, the wall of cement soil mixing pile, impervious membrane and anti-seepage curtain, est., according to the cutoff wall. (l)Pile is discontinuity in vertical direction because it is cut off or evenly in the process of mixing and grouting. (2) When the drill bit has a skew stirring in deep or machine moves oversized space. (3)The length of piles can not reach the position of design while constructing.It is extremely apt to destroy the balance of underground water flow field , making both sides of cutoff wall can produce high water conservancy slope lower, It is apt to take place the problem of steady seepage, extremely it can cause serious consequence that break down also under the situation. So measure in time after finishing the cutoff wall, confirm the quality hidden danger position of the cutoff wall, it is significant to remedy and deal with in time.The main conclusions that can be worked out by this study are as follows,1. In term of method principle, utilizing technology of high density electric receptivity and surface wave can realize the cement soil mixingpile can measure the construction quality of cutoff wall. Ground penetrating radar should be as one measuring way that generally investigate fast, combine with high density electric receptivity and Raylegh surface wave.2. When the technology of high density electric receptivity and surface wave carry on the work, the choice of the opportunity is very important; Generally high density electric receptivity technology needs to go on in the short age, surface wave technology needs in long age to implement.3. While utilizing technology of high density electric receptivity to measure, DP-P device is a optimum device. While utilizing surface wave technology to carry on the work, it is very important to observe the establishment of the system and focus.4. It is different that different electricity device reflection different shapes to defective cutoff wall. Various kinds of devices are relatively accurate to the reflection of the defective position, having phenomenon of exaggerating to the reflection of defective range. Utilize the surface wave can conform the position and depth of defective cutoff wall.5. It can establish quantization relation in electric resistivity, wave speed and corresponding impervious index on the cutoff wall. To different formative origin of cutoff wall, quantization formula coefficients are difference. Measure on scene needs to utilize the experiment materials of sample to come standard.6. Making up different method can form different scheme that wall measure. Thus, it can realize to measure the cutoff wall.